Energy and time spreads of the ion beam caused by the spiral inflector
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1998
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The spiral inflector (Root, M.S. Thesis, Ph.D. Thesis, University of British Columbia), as a part of the axial injection system of a cyclotron, is designed to inflect the ion beam with the introduction of a negligible energy spread. However, how close its real performance is to the analytical prediction depends on how close the operating conditions are to the assumed analytical stand-alone configuration. If the space in the central region of the cyclotron is limited, the electric field of the inflector and that of the electrodes of the radiofrequency (RF) system overlap, and the relevant zero-potential surface is quite complex. The dependence of the beam energy and time spreads after the inflector exit on the distance from the inflector exit was studied. The beam simulation results show that the beam energy spread decays with the distance from the inflector exit as expected, but that at 8 mm from the inflector exit it can still have the significant value of 0.67 keV (3% of the input en...ergy). The beam time spread is of no interest if a continuous beam is to be produced. However, in the case of a bunched beam, even the smallest obtained value for the output time spread of 3.5 ns (10% of the period of the RF system) may have an important influence on the total efficiency of the machine. Our results demonstrate that both of these spreads need to be taken into account in the further beam simulations between the RF electrodes. (C) 1998 Elsevier Science B.V. All rights reserved.
Ključne reči:
accelerators / cyclotrons / injection systems / electrostatic inflectorsIzvor:
Nuclear Instruments and Methods in Physics Research. Section A: Accelerators, Spectrometers, Detectors, and Associated Equipment, 1998, 406, 1, 172-176
DOI: 10.1016/S0168-9002(97)01203-5
ISSN: 0168-9002
WoS: 000072860400016
Scopus: 2-s2.0-0348116222
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Institucija/grupa
VinčaTY - JOUR AU - Ristić-Đurović, Jasna L. AU - Nešković, Nebojša B. PY - 1998 UR - https://vinar.vin.bg.ac.rs/handle/123456789/2123 AB - The spiral inflector (Root, M.S. Thesis, Ph.D. Thesis, University of British Columbia), as a part of the axial injection system of a cyclotron, is designed to inflect the ion beam with the introduction of a negligible energy spread. However, how close its real performance is to the analytical prediction depends on how close the operating conditions are to the assumed analytical stand-alone configuration. If the space in the central region of the cyclotron is limited, the electric field of the inflector and that of the electrodes of the radiofrequency (RF) system overlap, and the relevant zero-potential surface is quite complex. The dependence of the beam energy and time spreads after the inflector exit on the distance from the inflector exit was studied. The beam simulation results show that the beam energy spread decays with the distance from the inflector exit as expected, but that at 8 mm from the inflector exit it can still have the significant value of 0.67 keV (3% of the input energy). The beam time spread is of no interest if a continuous beam is to be produced. However, in the case of a bunched beam, even the smallest obtained value for the output time spread of 3.5 ns (10% of the period of the RF system) may have an important influence on the total efficiency of the machine. Our results demonstrate that both of these spreads need to be taken into account in the further beam simulations between the RF electrodes. (C) 1998 Elsevier Science B.V. All rights reserved. T2 - Nuclear Instruments and Methods in Physics Research. Section A: Accelerators, Spectrometers, Detectors, and Associated Equipment T1 - Energy and time spreads of the ion beam caused by the spiral inflector VL - 406 IS - 1 SP - 172 EP - 176 DO - 10.1016/S0168-9002(97)01203-5 ER -
@article{ author = "Ristić-Đurović, Jasna L. and Nešković, Nebojša B.", year = "1998", abstract = "The spiral inflector (Root, M.S. Thesis, Ph.D. Thesis, University of British Columbia), as a part of the axial injection system of a cyclotron, is designed to inflect the ion beam with the introduction of a negligible energy spread. However, how close its real performance is to the analytical prediction depends on how close the operating conditions are to the assumed analytical stand-alone configuration. If the space in the central region of the cyclotron is limited, the electric field of the inflector and that of the electrodes of the radiofrequency (RF) system overlap, and the relevant zero-potential surface is quite complex. The dependence of the beam energy and time spreads after the inflector exit on the distance from the inflector exit was studied. The beam simulation results show that the beam energy spread decays with the distance from the inflector exit as expected, but that at 8 mm from the inflector exit it can still have the significant value of 0.67 keV (3% of the input energy). The beam time spread is of no interest if a continuous beam is to be produced. However, in the case of a bunched beam, even the smallest obtained value for the output time spread of 3.5 ns (10% of the period of the RF system) may have an important influence on the total efficiency of the machine. Our results demonstrate that both of these spreads need to be taken into account in the further beam simulations between the RF electrodes. (C) 1998 Elsevier Science B.V. All rights reserved.", journal = "Nuclear Instruments and Methods in Physics Research. Section A: Accelerators, Spectrometers, Detectors, and Associated Equipment", title = "Energy and time spreads of the ion beam caused by the spiral inflector", volume = "406", number = "1", pages = "172-176", doi = "10.1016/S0168-9002(97)01203-5" }
Ristić-Đurović, J. L.,& Nešković, N. B.. (1998). Energy and time spreads of the ion beam caused by the spiral inflector. in Nuclear Instruments and Methods in Physics Research. Section A: Accelerators, Spectrometers, Detectors, and Associated Equipment, 406(1), 172-176. https://doi.org/10.1016/S0168-9002(97)01203-5
Ristić-Đurović JL, Nešković NB. Energy and time spreads of the ion beam caused by the spiral inflector. in Nuclear Instruments and Methods in Physics Research. Section A: Accelerators, Spectrometers, Detectors, and Associated Equipment. 1998;406(1):172-176. doi:10.1016/S0168-9002(97)01203-5 .
Ristić-Đurović, Jasna L., Nešković, Nebojša B., "Energy and time spreads of the ion beam caused by the spiral inflector" in Nuclear Instruments and Methods in Physics Research. Section A: Accelerators, Spectrometers, Detectors, and Associated Equipment, 406, no. 1 (1998):172-176, https://doi.org/10.1016/S0168-9002(97)01203-5 . .