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| TUPC020 |
Development of Non-destructive Beam Current Measurement for the iThemba LABS Cyclotrons
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1089 |
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- Z. Kormány
ATOMKI, Debrecen
- J. L. Conradie, J. L.G. Delsink, D. T. Fourie, J. V. Pilcher, P. F. Rohwer
iThemba LABS, Somerset West
- K. Juhasz
University of Debrecen, Debrecen
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The 200 MeV separated-sector cyclotron and its two 8 MeV solid-pole injector cyclotrons at iThemba LABS deliver beams of light and heavy ions, as well as polarized protons, with variable energy for nuclear physics research, a low-intensity proton 200 MeV beam for proton therapy and a high-intensity 66 MeV proton beam for neutron therapy and the production of radioisotopes. The intensity of the 66 MeV proton beam has recently been increased to 250 μA. This necessitated development of non-destructive beam diagnostic equipment, amongst others, for beam current measurement at various positions in the different beamlines. It was decided to determine the beam current by digitizing and analyzing the signals from capacitive phase probes on-line, instead of using more costly DC beam-current transformers. It was also important to design the phase probes with as low as possible inductance in their support to the diagnostic vacuum chambers to eliminate ringing in the probe signals. The design of the probes, the analyses of the probe signals and the results that were obtained with the equipment will be presented.
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