Paper |
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Other Keywords |
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PT14 |
Design of BPM PU for Low-Beta Proton Beam Using Magic Code
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proton linac, pick-up, BPM, MAGIC code, sensitivity |
199 |
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- 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
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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.
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PT29 |
Dark Current Measurements at the PITZ Rf Gun
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PITZ, gun, cathode, secondary-beams |
242 |
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- J.H. Han, I. Bohnet, M. Krasilnikov, F. Stephan
DESY-Zeuthen, Deutsches Elektronen-Synchrotron, Zeuthen, Germany
- K. Flöttmann
DESY, Deutsches Elektronen-Synchrotron, Hamburg, Germany
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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.
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