Acceptance of the channel for modification of materials (L3A) of the Tesla accelerator installation
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The channel for modification of materials (L3A) of the Tesla Accelerator Installation, in the Vinca Institute of Nuclear Sciences, connected to the mVINIS ion source, consists of an ion beam transport line and an interaction chamber enabling the ion beam assisted deposition. The 8.4 m long beam line, starting at an analyzing slit after an analyzing magnet, contains two electrostatic quadrupole triplet lenses: a 90degrees bending magnet and an electrostatic beam scanner. The maximal beam transmission coefficient, e.g., for 60 keV N4+ beam, has not exceeded 30%. At the time the beam line was designed, the mVINIS ion source was not commissioned, so that the emittances of the beams it delivered were underestimated. This is one of the reasons for the low transmission performance of the beam line. In this article the results of the beam line acceptance calculations are presented and compared with the measured beam emittances. The calculations are based on the transfer matrix formalism with n...o space charge taken into account. The suggestions for improving the beam transmission performance of the beam line are given. (C) 2004 American Institute of Physics.
Source:Review of Scientific Instruments, 2004, 75, 5, 1678-1680
- 10th International Conference on Ion Sources, Sep 08-13, 2003, Dubna, Russia