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simulation

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PT14 Design of BPM PU for Low-Beta Proton Beam Using Magic Code proton linac, pick-up, BPM, MAGIC code, sensitivity 199
 
  • S.J. Park, J.H. Park, Y.S. Bae, W.H. Hwang, J.Y. Huang, S.H. Nam
    POSTECH, Pohang Accelerator Laboratory, Pohang, Korea
  • Y.S. Cho, J.M. Han, S.H. Han, B.H. Choi
    KAERI, Proton Engineering Frontier Project, Korea
  We have designed the BPM PU based on capacitive buttons for use in the KOMAC (Korea Multi-purpose Accelerator Complex), the high-intensity proton linac that are under development at the KAERI (Korea Atomic Research Institute), Korea. The KOMAC is aiming to produce CW 20 mA beam current at the 100 MeV energy. We have chosen the button-type PU since it is easier to fabricate than other type PUs including the stripline, and it could provide enough signal power because of the high beam current. The PU sensitivity was calculated by the MAGIC that is a kind of the Particle-In-Cell code that originates from the plasma science community. The utilization of the MAGIC code is especially useful for BPM PUs in the low-beta sections of the accelerator, because it is difficult to obtain the PU sensitivity experimentally due to the difficulties in simulating the low-beta beams by the electromagnetic waves in a test bench. In this presentation, we report on the design of the BPM PU based on the MAGIC calculation.  
 
PT29 Dark Current Measurements at the PITZ Rf Gun PITZ, gun, cathode, secondary-beams 242
 
  • J.H. Han, I. Bohnet, M. Krasilnikov, F. Stephan
    DESY-Zeuthen, Deutsches Elektronen-Synchrotron, Zeuthen, Germany
  • K. Flöttmann
    DESY, Deutsches Elektronen-Synchrotron, Hamburg, Germany
  For photoelectron rf guns with acceleration gradients of 40 MV/m or higher at the photo cathode operated at the rf pulse length of 100 μs or more, the amount of dark current might be comparable with the photoelectron beam. Strong dark current can cause multipacting, radiation damages and cryogenic losses. At the photo injector test facility at DESY Zeuthen (PITZ) the dark current was measured with various solenoid setups at the rf gun by Faraday cup. We compare the dark current behavior of different photo cathodes. Experimental results are discussed with simulations.