TY  - JOUR
AU  - Ristić-Đurović, Jasna L.
AU  - Cirkovic, Sasa
AU  - Ilić, Anđelija Z.
PY  - 2013
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/5561
AB  - A quadrupole with equally charged electrodes could be used to focus as well as to accelerate ion beams. The equality of electrode charges causes the driving electric field of this device to be qualitatively different from that of other devices with a similar structure composed of four rod-like electrodes. For the same reason, the area of strong field influence on the beam is shifted towards the entrance and exit of the device. Consequently, it is expected that the devices performance depends on the shapes of its entrance and exit regions. The device parameters whose influence is studied are aperture radius, gap size, and rod length. Performance of the device is quantified with accelerating and focusing potentials, which are obtained as integrals of axial and radial electric fields. These variables are further used to choose optimal values of the device parameters for desired operation of the device.
T2  - IEEE Transactions on Nuclear Science
T1  - Optimization of Equally Charged Quadrupole Parameters
VL  - 60
IS  - 3
SP  - 2161
EP  - 2169
DO  - 10.1109/TNS.2013.2253618
ER  - 

@article{
author = "Ristić-Đurović, Jasna L. and Cirkovic, Sasa and Ilić, Anđelija Z.",
year = "2013",
abstract = "A quadrupole with equally charged electrodes could be used to focus as well as to accelerate ion beams. The equality of electrode charges causes the driving electric field of this device to be qualitatively different from that of other devices with a similar structure composed of four rod-like electrodes. For the same reason, the area of strong field influence on the beam is shifted towards the entrance and exit of the device. Consequently, it is expected that the devices performance depends on the shapes of its entrance and exit regions. The device parameters whose influence is studied are aperture radius, gap size, and rod length. Performance of the device is quantified with accelerating and focusing potentials, which are obtained as integrals of axial and radial electric fields. These variables are further used to choose optimal values of the device parameters for desired operation of the device.",
journal = "IEEE Transactions on Nuclear Science",
title = "Optimization of Equally Charged Quadrupole Parameters",
volume = "60",
number = "3",
pages = "2161-2169",
doi = "10.1109/TNS.2013.2253618"
}

Ristić-Đurović, J. L., Cirkovic, S.,& Ilić, A. Z.. (2013). Optimization of Equally Charged Quadrupole Parameters. in IEEE Transactions on Nuclear Science, 60(3), 2161-2169.
https://doi.org/10.1109/TNS.2013.2253618

Ristić-Đurović JL, Cirkovic S, Ilić AZ. Optimization of Equally Charged Quadrupole Parameters. in IEEE Transactions on Nuclear Science. 2013;60(3):2161-2169.
doi:10.1109/TNS.2013.2253618 .

Ristić-Đurović, Jasna L., Cirkovic, Sasa, Ilić, Anđelija Z., "Optimization of Equally Charged Quadrupole Parameters" in IEEE Transactions on Nuclear Science, 60, no. 3 (2013):2161-2169,
https://doi.org/10.1109/TNS.2013.2253618 . .

TY  - JOUR
AU  - Ristić-Đurović, Jasna L.
AU  - Cirkovic, Sasa
AU  - Ilić, Anđelija Z.
PY  - 2013
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/5560
AB  - The electrostatic quadrupole lens, quadrupole accelerator and square rainbow lens as well as radio frequency quadrupole accelerator all have similar structure with four rod-like electrodes. Unlike the last one, which is powered by the alternating voltage, the first three are electrostatic devices. Each two adjacent electrodes of a common electrostatic lens have equal magnitude and opposite signs of their electric potentials, whereas, electric potentials of rainbow lenss electrodes are all equal in magnitude as well as in sign. If powered by the appropriate radio frequency instead of a DC voltage, the rainbow lens transforms into an ion beam accelerator which could cost-effectively broaden the available energy range of low energy ion beam facilities.
T2  - IEEE Transactions on Nuclear Science
T1  - Ion Beam Acceleration With Radio Frequency Powered Rainbow Lens
VL  - 60
IS  - 2
SP  - 1272
EP  - 1279
DO  - 10.1109/TNS.2012.2230452
ER  - 

@article{
author = "Ristić-Đurović, Jasna L. and Cirkovic, Sasa and Ilić, Anđelija Z.",
year = "2013",
abstract = "The electrostatic quadrupole lens, quadrupole accelerator and square rainbow lens as well as radio frequency quadrupole accelerator all have similar structure with four rod-like electrodes. Unlike the last one, which is powered by the alternating voltage, the first three are electrostatic devices. Each two adjacent electrodes of a common electrostatic lens have equal magnitude and opposite signs of their electric potentials, whereas, electric potentials of rainbow lenss electrodes are all equal in magnitude as well as in sign. If powered by the appropriate radio frequency instead of a DC voltage, the rainbow lens transforms into an ion beam accelerator which could cost-effectively broaden the available energy range of low energy ion beam facilities.",
journal = "IEEE Transactions on Nuclear Science",
title = "Ion Beam Acceleration With Radio Frequency Powered Rainbow Lens",
volume = "60",
number = "2",
pages = "1272-1279",
doi = "10.1109/TNS.2012.2230452"
}

Ristić-Đurović, J. L., Cirkovic, S.,& Ilić, A. Z.. (2013). Ion Beam Acceleration With Radio Frequency Powered Rainbow Lens. in IEEE Transactions on Nuclear Science, 60(2), 1272-1279.
https://doi.org/10.1109/TNS.2012.2230452

Ristić-Đurović JL, Cirkovic S, Ilić AZ. Ion Beam Acceleration With Radio Frequency Powered Rainbow Lens. in IEEE Transactions on Nuclear Science. 2013;60(2):1272-1279.
doi:10.1109/TNS.2012.2230452 .

Ristić-Đurović, Jasna L., Cirkovic, Sasa, Ilić, Anđelija Z., "Ion Beam Acceleration With Radio Frequency Powered Rainbow Lens" in IEEE Transactions on Nuclear Science, 60, no. 2 (2013):1272-1279,
https://doi.org/10.1109/TNS.2012.2230452 . .

TY  - JOUR
AU  - Ristić-Đurović, Jasna L.
AU  - Ilić, Anđelija Z.
PY  - 2013
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/5309
AB  - Dynamics of an ensemble of particles is often studied by tracking a large number of test particles from a chosen initial state to an adequately defined final state. Random distributions of particles over considered parameters are frequently used to describe an initial state of studied ensemble. Randomness of input data insures that there is no overlapping in test particles visualization; however, it hides the dependencies between various input and output parameters. If non-random, uniformly distributed input data is used, relationships between the input and output variables are revealed. Further, mapping of such an input into its output together with an appropriate interpolation scheme contains description of an output corresponding to any desired distribution of input data. A mapping of non-random uniformly distributed input into its output is combined with n-dimensional linear interpolation into a method for studying dynamics of an ensemble of particles. Advantages and efficiency of the method are illustrated using an ion beam interaction with two devices: the four parallel, equally spaced finite wires and the spiral inflector. The method is applicable if interactions between particles within an ensemble are negligible compared to other forces involved.
T2  - IEEE Transactions on Nuclear Science
T1  - Role and Significance of Uniform Distribution in a Study of Ensemble of Particles
VL  - 60
IS  - 1
SP  - 236
EP  - 245
DO  - 10.1109/TNS.2012.2225153
ER  - 

@article{
author = "Ristić-Đurović, Jasna L. and Ilić, Anđelija Z.",
year = "2013",
abstract = "Dynamics of an ensemble of particles is often studied by tracking a large number of test particles from a chosen initial state to an adequately defined final state. Random distributions of particles over considered parameters are frequently used to describe an initial state of studied ensemble. Randomness of input data insures that there is no overlapping in test particles visualization; however, it hides the dependencies between various input and output parameters. If non-random, uniformly distributed input data is used, relationships between the input and output variables are revealed. Further, mapping of such an input into its output together with an appropriate interpolation scheme contains description of an output corresponding to any desired distribution of input data. A mapping of non-random uniformly distributed input into its output is combined with n-dimensional linear interpolation into a method for studying dynamics of an ensemble of particles. Advantages and efficiency of the method are illustrated using an ion beam interaction with two devices: the four parallel, equally spaced finite wires and the spiral inflector. The method is applicable if interactions between particles within an ensemble are negligible compared to other forces involved.",
journal = "IEEE Transactions on Nuclear Science",
title = "Role and Significance of Uniform Distribution in a Study of Ensemble of Particles",
volume = "60",
number = "1",
pages = "236-245",
doi = "10.1109/TNS.2012.2225153"
}

Ristić-Đurović, J. L.,& Ilić, A. Z.. (2013). Role and Significance of Uniform Distribution in a Study of Ensemble of Particles. in IEEE Transactions on Nuclear Science, 60(1), 236-245.
https://doi.org/10.1109/TNS.2012.2225153

Ristić-Đurović JL, Ilić AZ. Role and Significance of Uniform Distribution in a Study of Ensemble of Particles. in IEEE Transactions on Nuclear Science. 2013;60(1):236-245.
doi:10.1109/TNS.2012.2225153 .

Ristić-Đurović, Jasna L., Ilić, Anđelija Z., "Role and Significance of Uniform Distribution in a Study of Ensemble of Particles" in IEEE Transactions on Nuclear Science, 60, no. 1 (2013):236-245,
https://doi.org/10.1109/TNS.2012.2225153 . .

TY  - JOUR
AU  - Cirkovic, Sasa
AU  - Ilić, Anđelija Z.
AU  - Dobrosavljević, Aleksandar S.
AU  - Balvanović, Roman V.
AU  - Ristić-Đurović, Jasna L.
PY  - 2012
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/4862
AB  - Systematic errors caused by the deficiencies of the measurement equipment are occurring relatively often in the engineering practice. The magnetic field measurement system of the VINCY Cyclotron has been designed well; however, due to the practical limitations in the machining process fabrication errors are imminent. We present our experiences with the produced measurement system and the techniques used for the detection and correction of errors. A change in the measuring protocol is suggested in order to overcome otherwise unavoidable errors caused by measuring system machining imperfections. (C) 2012 Elsevier B.V. All rights reserved.
T2  - Nuclear Instruments and Methods in Physics Research. Section A: Accelerators, Spectrometers, Detectors, and Associated Equipment
T1  - Minimization of the measurement errors induced by the cyclotron magnetic field measurement system
VL  - 679
SP  - 54
EP  - 60
DO  - 10.1016/j.nima.2012.03.018
ER  - 

@article{
author = "Cirkovic, Sasa and Ilić, Anđelija Z. and Dobrosavljević, Aleksandar S. and Balvanović, Roman V. and Ristić-Đurović, Jasna L.",
year = "2012",
abstract = "Systematic errors caused by the deficiencies of the measurement equipment are occurring relatively often in the engineering practice. The magnetic field measurement system of the VINCY Cyclotron has been designed well; however, due to the practical limitations in the machining process fabrication errors are imminent. We present our experiences with the produced measurement system and the techniques used for the detection and correction of errors. A change in the measuring protocol is suggested in order to overcome otherwise unavoidable errors caused by measuring system machining imperfections. (C) 2012 Elsevier B.V. All rights reserved.",
journal = "Nuclear Instruments and Methods in Physics Research. Section A: Accelerators, Spectrometers, Detectors, and Associated Equipment",
title = "Minimization of the measurement errors induced by the cyclotron magnetic field measurement system",
volume = "679",
pages = "54-60",
doi = "10.1016/j.nima.2012.03.018"
}

Cirkovic, S., Ilić, A. Z., Dobrosavljević, A. S., Balvanović, R. V.,& Ristić-Đurović, J. L.. (2012). Minimization of the measurement errors induced by the cyclotron magnetic field measurement system. in Nuclear Instruments and Methods in Physics Research. Section A: Accelerators, Spectrometers, Detectors, and Associated Equipment, 679, 54-60.
https://doi.org/10.1016/j.nima.2012.03.018

Cirkovic S, Ilić AZ, Dobrosavljević AS, Balvanović RV, Ristić-Đurović JL. Minimization of the measurement errors induced by the cyclotron magnetic field measurement system. in Nuclear Instruments and Methods in Physics Research. Section A: Accelerators, Spectrometers, Detectors, and Associated Equipment. 2012;679:54-60.
doi:10.1016/j.nima.2012.03.018 .

Cirkovic, Sasa, Ilić, Anđelija Z., Dobrosavljević, Aleksandar S., Balvanović, Roman V., Ristić-Đurović, Jasna L., "Minimization of the measurement errors induced by the cyclotron magnetic field measurement system" in Nuclear Instruments and Methods in Physics Research. Section A: Accelerators, Spectrometers, Detectors, and Associated Equipment, 679 (2012):54-60,
https://doi.org/10.1016/j.nima.2012.03.018 . .

TY  - CONF
AU  - Savić, Slobodan V.
AU  - Ilić, Anđelija Z.
AU  - Notaros, Branislav M.
AU  - Ilić, Milan M.
PY  - 2012
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/6995
AB  - Parallelization of time-consuming volume integrations in the matrix filling is performed using OpenMP to provide a smooth transition of a higher order finite element method (FEM) code for electromagnetic analysis to the multi-core hardware architecture. In the process, the carefully constructed original computational scheme suited to maximally avoid the redundant computations in the higher order FEM is not affected. The results, in analysis of an electrically large dielectric scatterer, demonstrate acceleration of up to 2.28 times in a four-thread architecture.
C3  - 20th Telecommunications Forum (TELFOR)
T1  - Acceleration of Higher Order FEM Matrix Filling by OpenMP Parallelization of Volume Integrations
SP  - 1183
UR  - https://hdl.handle.net/21.15107/rcub_vinar_6995
ER  - 

@conference{
author = "Savić, Slobodan V. and Ilić, Anđelija Z. and Notaros, Branislav M. and Ilić, Milan M.",
year = "2012",
abstract = "Parallelization of time-consuming volume integrations in the matrix filling is performed using OpenMP to provide a smooth transition of a higher order finite element method (FEM) code for electromagnetic analysis to the multi-core hardware architecture. In the process, the carefully constructed original computational scheme suited to maximally avoid the redundant computations in the higher order FEM is not affected. The results, in analysis of an electrically large dielectric scatterer, demonstrate acceleration of up to 2.28 times in a four-thread architecture.",
journal = "20th Telecommunications Forum (TELFOR)",
title = "Acceleration of Higher Order FEM Matrix Filling by OpenMP Parallelization of Volume Integrations",
pages = "1183",
url = "https://hdl.handle.net/21.15107/rcub_vinar_6995"
}

Savić, S. V., Ilić, A. Z., Notaros, B. M.,& Ilić, M. M.. (2012). Acceleration of Higher Order FEM Matrix Filling by OpenMP Parallelization of Volume Integrations. in 20th Telecommunications Forum (TELFOR), 1183.
https://hdl.handle.net/21.15107/rcub_vinar_6995

Savić SV, Ilić AZ, Notaros BM, Ilić MM. Acceleration of Higher Order FEM Matrix Filling by OpenMP Parallelization of Volume Integrations. in 20th Telecommunications Forum (TELFOR). 2012;:1183.
https://hdl.handle.net/21.15107/rcub_vinar_6995 .

Savić, Slobodan V., Ilić, Anđelija Z., Notaros, Branislav M., Ilić, Milan M., "Acceleration of Higher Order FEM Matrix Filling by OpenMP Parallelization of Volume Integrations" in 20th Telecommunications Forum (TELFOR) (2012):1183,
https://hdl.handle.net/21.15107/rcub_vinar_6995 .

TY  - JOUR
AU  - Ilić, Anđelija Z.
AU  - Ristić-Đurović, Jasna L.
AU  - Cirkovic, Sasa
AU  - Nešković, Nebojša B.
PY  - 2012
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/4805
AB  - A novel method for efficient analysis of ion beam acceleration in an isochronous cyclotron is proposed. Numerical simulation is used to perform multiple beam dynamics analyses on the conveniently chosen subsets of data; consequently, the total quantity of studied data is significantly reduced. The obtained results provide direct insight into beam behavior and quality of acceleration. Therefore, the analysis is not only efficient, but detailed and systematic as well. It is used to assess the impact of the accelerated orbit optimization to the enhancement of acceleration efficiency when study is extended from a single test ion to the complete ion beam consideration.
T2  - IEEE Transactions on Nuclear Science
T1  - Enhancement of Ion Beam Acceleration Efficiency in Isochronous Cyclotrons
VL  - 59
IS  - 2
SP  - 272
EP  - 280
DO  - 10.1109/TNS.2011.2180737
ER  - 

@article{
author = "Ilić, Anđelija Z. and Ristić-Đurović, Jasna L. and Cirkovic, Sasa and Nešković, Nebojša B.",
year = "2012",
abstract = "A novel method for efficient analysis of ion beam acceleration in an isochronous cyclotron is proposed. Numerical simulation is used to perform multiple beam dynamics analyses on the conveniently chosen subsets of data; consequently, the total quantity of studied data is significantly reduced. The obtained results provide direct insight into beam behavior and quality of acceleration. Therefore, the analysis is not only efficient, but detailed and systematic as well. It is used to assess the impact of the accelerated orbit optimization to the enhancement of acceleration efficiency when study is extended from a single test ion to the complete ion beam consideration.",
journal = "IEEE Transactions on Nuclear Science",
title = "Enhancement of Ion Beam Acceleration Efficiency in Isochronous Cyclotrons",
volume = "59",
number = "2",
pages = "272-280",
doi = "10.1109/TNS.2011.2180737"
}

Ilić, A. Z., Ristić-Đurović, J. L., Cirkovic, S.,& Nešković, N. B.. (2012). Enhancement of Ion Beam Acceleration Efficiency in Isochronous Cyclotrons. in IEEE Transactions on Nuclear Science, 59(2), 272-280.
https://doi.org/10.1109/TNS.2011.2180737

Ilić AZ, Ristić-Đurović JL, Cirkovic S, Nešković NB. Enhancement of Ion Beam Acceleration Efficiency in Isochronous Cyclotrons. in IEEE Transactions on Nuclear Science. 2012;59(2):272-280.
doi:10.1109/TNS.2011.2180737 .

Ilić, Anđelija Z., Ristić-Đurović, Jasna L., Cirkovic, Sasa, Nešković, Nebojša B., "Enhancement of Ion Beam Acceleration Efficiency in Isochronous Cyclotrons" in IEEE Transactions on Nuclear Science, 59, no. 2 (2012):272-280,
https://doi.org/10.1109/TNS.2011.2180737 . .

TY  - JOUR
AU  - Djordjevich, Drago M.
AU  - De Luka, Silvio R.
AU  - Milovanović, Ivan D.
AU  - Janković, Saša
AU  - Stefanovic, Srdjan
AU  - Veskovic-Moracanin, Slavica
AU  - Cirkovic, Sasa
AU  - Ilić, Anđelija Z.
AU  - Ristić-Đurović, Jasna L.
AU  - Trbovich, Alexander M.
PY  - 2012
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/4920
AB  - Static magnetic fields (SMFs) are time independent fields whose intensity can be spatially dependent. This study investigates influence of subchronic continuous exposure to upward and downward directed SMF on hematological parameters and spleen cellularity in mice. The experiment is performed on the Northern hemisphere; consequently, the vertical component of geomagnetic field is directed downward. Male, Swiss-Webster, 6 weeks old mice were exposed to the vertically declining SMF. Mice were divided in three groups and continuously exposed or not exposed for 28 days to the SMF characterized by the averaged field of 16 mT and averaged field gradient of 10 mT/cm. Differently oriented SMF did not alter hemoglobin and hematocrit content among the groups. However, the groups exposed to the upward and downward fields had statistically significant higher levels of serum transferrin compared to the control. Moreover, spleen cellularity in animals in the downward group was significantly higher compared to the upward and control group. In addition, spleen lymphocytes in both of the exposed groups were significantly higher than in the control group. In contrast, spleen granulocytes in the exposed groups were significantly lower than in the control group. Significant decrease was also observed in brain and liver iron content with concomitant increase of iron in serum and spleen in exposed animals. Subchronic continuous exposure to 16 mT SMF caused lymphocyte and granulocyte redistribution between spleen and blood. This distribution is typical for stress induced hematological changes. These results suggest that observed changes were not due to an unspecific stress response, but that they were rather caused by specific adaptation to subchronic SMF exposure. (C) 2012 Elsevier Inc. All rights reserved.
T2  - Ecotoxicology and Environmental Safety
T1  - Hematological parameters changes in mice subchronically exposed to static magnetic fields of different orientations
VL  - 81
SP  - 98
EP  - 105
DO  - 10.1016/j.ecoenv.2012.04.025
ER  - 

@article{
author = "Djordjevich, Drago M. and De Luka, Silvio R. and Milovanović, Ivan D. and Janković, Saša and Stefanovic, Srdjan and Veskovic-Moracanin, Slavica and Cirkovic, Sasa and Ilić, Anđelija Z. and Ristić-Đurović, Jasna L. and Trbovich, Alexander M.",
year = "2012",
abstract = "Static magnetic fields (SMFs) are time independent fields whose intensity can be spatially dependent. This study investigates influence of subchronic continuous exposure to upward and downward directed SMF on hematological parameters and spleen cellularity in mice. The experiment is performed on the Northern hemisphere; consequently, the vertical component of geomagnetic field is directed downward. Male, Swiss-Webster, 6 weeks old mice were exposed to the vertically declining SMF. Mice were divided in three groups and continuously exposed or not exposed for 28 days to the SMF characterized by the averaged field of 16 mT and averaged field gradient of 10 mT/cm. Differently oriented SMF did not alter hemoglobin and hematocrit content among the groups. However, the groups exposed to the upward and downward fields had statistically significant higher levels of serum transferrin compared to the control. Moreover, spleen cellularity in animals in the downward group was significantly higher compared to the upward and control group. In addition, spleen lymphocytes in both of the exposed groups were significantly higher than in the control group. In contrast, spleen granulocytes in the exposed groups were significantly lower than in the control group. Significant decrease was also observed in brain and liver iron content with concomitant increase of iron in serum and spleen in exposed animals. Subchronic continuous exposure to 16 mT SMF caused lymphocyte and granulocyte redistribution between spleen and blood. This distribution is typical for stress induced hematological changes. These results suggest that observed changes were not due to an unspecific stress response, but that they were rather caused by specific adaptation to subchronic SMF exposure. (C) 2012 Elsevier Inc. All rights reserved.",
journal = "Ecotoxicology and Environmental Safety",
title = "Hematological parameters changes in mice subchronically exposed to static magnetic fields of different orientations",
volume = "81",
pages = "98-105",
doi = "10.1016/j.ecoenv.2012.04.025"
}

Djordjevich, D. M., De Luka, S. R., Milovanović, I. D., Janković, S., Stefanovic, S., Veskovic-Moracanin, S., Cirkovic, S., Ilić, A. Z., Ristić-Đurović, J. L.,& Trbovich, A. M.. (2012). Hematological parameters changes in mice subchronically exposed to static magnetic fields of different orientations. in Ecotoxicology and Environmental Safety, 81, 98-105.
https://doi.org/10.1016/j.ecoenv.2012.04.025

Djordjevich DM, De Luka SR, Milovanović ID, Janković S, Stefanovic S, Veskovic-Moracanin S, Cirkovic S, Ilić AZ, Ristić-Đurović JL, Trbovich AM. Hematological parameters changes in mice subchronically exposed to static magnetic fields of different orientations. in Ecotoxicology and Environmental Safety. 2012;81:98-105.
doi:10.1016/j.ecoenv.2012.04.025 .

Djordjevich, Drago M., De Luka, Silvio R., Milovanović, Ivan D., Janković, Saša, Stefanovic, Srdjan, Veskovic-Moracanin, Slavica, Cirkovic, Sasa, Ilić, Anđelija Z., Ristić-Đurović, Jasna L., Trbovich, Alexander M., "Hematological parameters changes in mice subchronically exposed to static magnetic fields of different orientations" in Ecotoxicology and Environmental Safety, 81 (2012):98-105,
https://doi.org/10.1016/j.ecoenv.2012.04.025 . .

TY  - JOUR
AU  - Ilić, Milan M.
AU  - Savić, Slobodan V.
AU  - Ilić, Anđelija Z.
AU  - Notaros, Branislav M.
PY  - 2011
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/4643
AB  - A constant speed parametrization (CSP) mapping of boundary surfaces is proposed for moment-method analysis of antennas and scatterers, along with its approximation using large higher-order Lagrange-type curved quadrilateral patches. The importance of the proper placement of interpolation nodes that ensures minimum mapped parametric space distortion (arc-length parametrization) is explained and demonstrated on simple examples. The CSP mapping results in on average five times lower radar cross section (RCS) error for a spherical scatterer than with the ray casting (central projection) parametrization mapping. The extension of the CSP concept to arbitrary surfaces is illustrated in modeling of the double-ogive target.
T2  - IEEE Antennas and Wireless Propagation Letters
T1  - Constant Speed Parametrization Mapping of Curved Boundary Surfaces in Higher-Order Moment-Method Electromagnetic Modeling
VL  - 10
SP  - 1457
EP  - 1460
DO  - 10.1109/LAWP.2011.2180354
ER  - 

@article{
author = "Ilić, Milan M. and Savić, Slobodan V. and Ilić, Anđelija Z. and Notaros, Branislav M.",
year = "2011",
abstract = "A constant speed parametrization (CSP) mapping of boundary surfaces is proposed for moment-method analysis of antennas and scatterers, along with its approximation using large higher-order Lagrange-type curved quadrilateral patches. The importance of the proper placement of interpolation nodes that ensures minimum mapped parametric space distortion (arc-length parametrization) is explained and demonstrated on simple examples. The CSP mapping results in on average five times lower radar cross section (RCS) error for a spherical scatterer than with the ray casting (central projection) parametrization mapping. The extension of the CSP concept to arbitrary surfaces is illustrated in modeling of the double-ogive target.",
journal = "IEEE Antennas and Wireless Propagation Letters",
title = "Constant Speed Parametrization Mapping of Curved Boundary Surfaces in Higher-Order Moment-Method Electromagnetic Modeling",
volume = "10",
pages = "1457-1460",
doi = "10.1109/LAWP.2011.2180354"
}

Ilić, M. M., Savić, S. V., Ilić, A. Z.,& Notaros, B. M.. (2011). Constant Speed Parametrization Mapping of Curved Boundary Surfaces in Higher-Order Moment-Method Electromagnetic Modeling. in IEEE Antennas and Wireless Propagation Letters, 10, 1457-1460.
https://doi.org/10.1109/LAWP.2011.2180354

Ilić MM, Savić SV, Ilić AZ, Notaros BM. Constant Speed Parametrization Mapping of Curved Boundary Surfaces in Higher-Order Moment-Method Electromagnetic Modeling. in IEEE Antennas and Wireless Propagation Letters. 2011;10:1457-1460.
doi:10.1109/LAWP.2011.2180354 .

Ilić, Milan M., Savić, Slobodan V., Ilić, Anđelija Z., Notaros, Branislav M., "Constant Speed Parametrization Mapping of Curved Boundary Surfaces in Higher-Order Moment-Method Electromagnetic Modeling" in IEEE Antennas and Wireless Propagation Letters, 10 (2011):1457-1460,
https://doi.org/10.1109/LAWP.2011.2180354 . .

TY  - JOUR
AU  - Ilić, Milan M.
AU  - Ilić, Anđelija Z.
AU  - Notaros, Branislav M.
PY  - 2009
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/3779
AB  - A novel higher order entire-domain finite element technique is presented for accurate and efficient full-wave three-dimensional (3-D) analysis of electromagnetic structures with continuously inhomogeneous material regions, using large generalized curved hierarchical curl-conforming hexahedral vector finite elements that allow continuous change of medium parameters throughout their volumes. This is the first general 3-D implementation and numerical demonstration of the inherent theoretical ability of the finite element method (FEM) to directly treat arbitrarily (continuously) inhomogeneous materials. The results demonstrate considerable reductions in both number of unknowns and computation time of the entire-domain FEM modeling of continuously inhomogeneous materials over piecewise homogeneous models. They indicate that, in addition to theoretical relevance and interest, large curved higher order continuous-FEM elements also have great potential for practical applications that include structures with pronounced material inhomogeneities and complexities.
T2  - IEEE Transactions on Antennas and Propagation
T1  - Continuously Inhomogeneous Higher Order Finite Elements for 3-D Electromagnetic Analysis
VL  - 57
IS  - 9
SP  - 2798
EP  - 2803
DO  - 10.1109/TAP.2009.2027350
ER  - 

@article{
author = "Ilić, Milan M. and Ilić, Anđelija Z. and Notaros, Branislav M.",
year = "2009",
abstract = "A novel higher order entire-domain finite element technique is presented for accurate and efficient full-wave three-dimensional (3-D) analysis of electromagnetic structures with continuously inhomogeneous material regions, using large generalized curved hierarchical curl-conforming hexahedral vector finite elements that allow continuous change of medium parameters throughout their volumes. This is the first general 3-D implementation and numerical demonstration of the inherent theoretical ability of the finite element method (FEM) to directly treat arbitrarily (continuously) inhomogeneous materials. The results demonstrate considerable reductions in both number of unknowns and computation time of the entire-domain FEM modeling of continuously inhomogeneous materials over piecewise homogeneous models. They indicate that, in addition to theoretical relevance and interest, large curved higher order continuous-FEM elements also have great potential for practical applications that include structures with pronounced material inhomogeneities and complexities.",
journal = "IEEE Transactions on Antennas and Propagation",
title = "Continuously Inhomogeneous Higher Order Finite Elements for 3-D Electromagnetic Analysis",
volume = "57",
number = "9",
pages = "2798-2803",
doi = "10.1109/TAP.2009.2027350"
}

Ilić, M. M., Ilić, A. Z.,& Notaros, B. M.. (2009). Continuously Inhomogeneous Higher Order Finite Elements for 3-D Electromagnetic Analysis. in IEEE Transactions on Antennas and Propagation, 57(9), 2798-2803.
https://doi.org/10.1109/TAP.2009.2027350

Ilić MM, Ilić AZ, Notaros BM. Continuously Inhomogeneous Higher Order Finite Elements for 3-D Electromagnetic Analysis. in IEEE Transactions on Antennas and Propagation. 2009;57(9):2798-2803.
doi:10.1109/TAP.2009.2027350 .

Ilić, Milan M., Ilić, Anđelija Z., Notaros, Branislav M., "Continuously Inhomogeneous Higher Order Finite Elements for 3-D Electromagnetic Analysis" in IEEE Transactions on Antennas and Propagation, 57, no. 9 (2009):2798-2803,
https://doi.org/10.1109/TAP.2009.2027350 . .

TY  - JOUR
AU  - Ilić, Milan M.
AU  - Đorđević, Miroslav
AU  - Ilić, Anđelija Z.
AU  - Notaros, Branislav M.
PY  - 2009
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/3696
AB  - A novel higher order large-domain hybrid computational electromagnetic technique based on the finite element method (FEM) and method of moments (MoM) is proposed for three-dimensional analysis of antennas and scatterers in the frequency domain. The geometry of the structure is modeled using generalized curved parametric hexahedral and quadrilateral elements of arbitrary geometrical orders. The fields and currents on elements are modeled using curl- and divergence-conforming hierarchical polynomial vector basis functions of arbitrary approximation orders, and the Galerkin method is used for testing. The elements can be as large as about two wavelengths in each dimension. As multiple MoM objects are possible in a global exterior region, the MoM part provides much greater modeling versatility and potential for applications, especially in antenna problems, than just as a boundary-integral closure to the FEM part. The examples demonstrate excellent accuracy, convergence, efficiency, and versatility of the new FEM-MoM technique, and very effective large-domain meshes that consist of a very small number of large flat and curved FEM and MoM elements, with p-refined field and current distributions of high approximation orders. The reduction in the number of unknowns is by two orders of magnitude when compared to available data for low-order FEM-MoM modeling.
T2  - IEEE Transactions on Antennas and Propagation
T1  - Higher Order Hybrid FEM-MoM Technique for Analysis of Antennas and Scatterers
VL  - 57
IS  - 5
SP  - 1452
EP  - 1460
DO  - 10.1109/TAP.2009.2016725
ER  - 

@article{
author = "Ilić, Milan M. and Đorđević, Miroslav and Ilić, Anđelija Z. and Notaros, Branislav M.",
year = "2009",
abstract = "A novel higher order large-domain hybrid computational electromagnetic technique based on the finite element method (FEM) and method of moments (MoM) is proposed for three-dimensional analysis of antennas and scatterers in the frequency domain. The geometry of the structure is modeled using generalized curved parametric hexahedral and quadrilateral elements of arbitrary geometrical orders. The fields and currents on elements are modeled using curl- and divergence-conforming hierarchical polynomial vector basis functions of arbitrary approximation orders, and the Galerkin method is used for testing. The elements can be as large as about two wavelengths in each dimension. As multiple MoM objects are possible in a global exterior region, the MoM part provides much greater modeling versatility and potential for applications, especially in antenna problems, than just as a boundary-integral closure to the FEM part. The examples demonstrate excellent accuracy, convergence, efficiency, and versatility of the new FEM-MoM technique, and very effective large-domain meshes that consist of a very small number of large flat and curved FEM and MoM elements, with p-refined field and current distributions of high approximation orders. The reduction in the number of unknowns is by two orders of magnitude when compared to available data for low-order FEM-MoM modeling.",
journal = "IEEE Transactions on Antennas and Propagation",
title = "Higher Order Hybrid FEM-MoM Technique for Analysis of Antennas and Scatterers",
volume = "57",
number = "5",
pages = "1452-1460",
doi = "10.1109/TAP.2009.2016725"
}

Ilić, M. M., Đorđević, M., Ilić, A. Z.,& Notaros, B. M.. (2009). Higher Order Hybrid FEM-MoM Technique for Analysis of Antennas and Scatterers. in IEEE Transactions on Antennas and Propagation, 57(5), 1452-1460.
https://doi.org/10.1109/TAP.2009.2016725

Ilić MM, Đorđević M, Ilić AZ, Notaros BM. Higher Order Hybrid FEM-MoM Technique for Analysis of Antennas and Scatterers. in IEEE Transactions on Antennas and Propagation. 2009;57(5):1452-1460.
doi:10.1109/TAP.2009.2016725 .

Ilić, Milan M., Đorđević, Miroslav, Ilić, Anđelija Z., Notaros, Branislav M., "Higher Order Hybrid FEM-MoM Technique for Analysis of Antennas and Scatterers" in IEEE Transactions on Antennas and Propagation, 57, no. 5 (2009):1452-1460,
https://doi.org/10.1109/TAP.2009.2016725 . .

TY  - JOUR
AU  - Ilić, Anđelija Z.
AU  - Ristić-Đurović, Jasna L.
AU  - Cirkovic, Sasa
AU  - Dobrosavljević, Aleksandar S.
AU  - Nešković, Nebojša B.
PY  - 2009
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/3729
AB  - During the design of a cyclotron the time and attention dedicated to the injection and extraction of a beam usually overcome those devoted to the acceleration. However, the efficiency of the accelerating process largely contributes to the overall efficiency of the machine because the beam spends the most time in the accelerating region. A thorough and systematic study of the influence of beam parameters on the overall quality of acceleration is performed. The conditions for the optimal acceleration are determined and the method for defining the complete continuous sets of input parameters providing such acceleration is proposed.
T2  - IEEE Transactions on Nuclear Science
T1  - Optimal Acceleration in Isochronous Straight Sector Cyclotrons
VL  - 56
IS  - 3
SP  - 1498
EP  - 1506
DO  - 10.1109/TNS.2009.2020899
ER  - 

@article{
author = "Ilić, Anđelija Z. and Ristić-Đurović, Jasna L. and Cirkovic, Sasa and Dobrosavljević, Aleksandar S. and Nešković, Nebojša B.",
year = "2009",
abstract = "During the design of a cyclotron the time and attention dedicated to the injection and extraction of a beam usually overcome those devoted to the acceleration. However, the efficiency of the accelerating process largely contributes to the overall efficiency of the machine because the beam spends the most time in the accelerating region. A thorough and systematic study of the influence of beam parameters on the overall quality of acceleration is performed. The conditions for the optimal acceleration are determined and the method for defining the complete continuous sets of input parameters providing such acceleration is proposed.",
journal = "IEEE Transactions on Nuclear Science",
title = "Optimal Acceleration in Isochronous Straight Sector Cyclotrons",
volume = "56",
number = "3",
pages = "1498-1506",
doi = "10.1109/TNS.2009.2020899"
}

Ilić, A. Z., Ristić-Đurović, J. L., Cirkovic, S., Dobrosavljević, A. S.,& Nešković, N. B.. (2009). Optimal Acceleration in Isochronous Straight Sector Cyclotrons. in IEEE Transactions on Nuclear Science, 56(3), 1498-1506.
https://doi.org/10.1109/TNS.2009.2020899

Ilić AZ, Ristić-Đurović JL, Cirkovic S, Dobrosavljević AS, Nešković NB. Optimal Acceleration in Isochronous Straight Sector Cyclotrons. in IEEE Transactions on Nuclear Science. 2009;56(3):1498-1506.
doi:10.1109/TNS.2009.2020899 .

Ilić, Anđelija Z., Ristić-Đurović, Jasna L., Cirkovic, Sasa, Dobrosavljević, Aleksandar S., Nešković, Nebojša B., "Optimal Acceleration in Isochronous Straight Sector Cyclotrons" in IEEE Transactions on Nuclear Science, 56, no. 3 (2009):1498-1506,
https://doi.org/10.1109/TNS.2009.2020899 . .

TY  - JOUR
AU  - Cirkovic, Sasa
AU  - Ristić-Đurović, Jasna L.
AU  - Vorozhtsov, Alexey S.
AU  - Ilić, Anđelija Z.
AU  - Nešković, Nebojša B.
PY  - 2009
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/3808
AB  - The fine shaping of a cyclotron magnet is usually conducted through an iterative procedure by matching the obtained and the required pre-calculated magnetic field. The quality of the obtained magnetic field is then evaluated by the closeness of the resulting ion gyration frequency to its required value. The method we propose is based directly on the gyration frequency adjustment; therefore, the pre-calculated magnetic field criterion and the empirical weight factors often needed for the corresponding shape estimate are avoided. The method is applicable to the angular width as well as the thickness of the magnet elements used in title shaping.
T2  - IEEE Transactions on Nuclear Science
T1  - Method for Fine Magnet Shaping in Cyclotrons
VL  - 56
IS  - 5
SP  - 2821
EP  - 2827
DO  - 10.1109/TNS.2009.2027235
ER  - 

@article{
author = "Cirkovic, Sasa and Ristić-Đurović, Jasna L. and Vorozhtsov, Alexey S. and Ilić, Anđelija Z. and Nešković, Nebojša B.",
year = "2009",
abstract = "The fine shaping of a cyclotron magnet is usually conducted through an iterative procedure by matching the obtained and the required pre-calculated magnetic field. The quality of the obtained magnetic field is then evaluated by the closeness of the resulting ion gyration frequency to its required value. The method we propose is based directly on the gyration frequency adjustment; therefore, the pre-calculated magnetic field criterion and the empirical weight factors often needed for the corresponding shape estimate are avoided. The method is applicable to the angular width as well as the thickness of the magnet elements used in title shaping.",
journal = "IEEE Transactions on Nuclear Science",
title = "Method for Fine Magnet Shaping in Cyclotrons",
volume = "56",
number = "5",
pages = "2821-2827",
doi = "10.1109/TNS.2009.2027235"
}

Cirkovic, S., Ristić-Đurović, J. L., Vorozhtsov, A. S., Ilić, A. Z.,& Nešković, N. B.. (2009). Method for Fine Magnet Shaping in Cyclotrons. in IEEE Transactions on Nuclear Science, 56(5), 2821-2827.
https://doi.org/10.1109/TNS.2009.2027235

Cirkovic S, Ristić-Đurović JL, Vorozhtsov AS, Ilić AZ, Nešković NB. Method for Fine Magnet Shaping in Cyclotrons. in IEEE Transactions on Nuclear Science. 2009;56(5):2821-2827.
doi:10.1109/TNS.2009.2027235 .

Cirkovic, Sasa, Ristić-Đurović, Jasna L., Vorozhtsov, Alexey S., Ilić, Anđelija Z., Nešković, Nebojša B., "Method for Fine Magnet Shaping in Cyclotrons" in IEEE Transactions on Nuclear Science, 56, no. 5 (2009):2821-2827,
https://doi.org/10.1109/TNS.2009.2027235 . .