| Paper |
Title |
Page |
| TUPAN056 |
Fabrication Status of ACS Accelerating Modules of J-PARC Linac
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1514 |
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- H. Ao, K. Hirano, T. Morishita, A. Ueno
JAEA/LINAC, Ibaraki-ken
- K. Hasegawa
JAEA, Ibaraki-ken
- M. Ikegami
KEK, Ibaraki
- V. V. Paramonov
RAS/INR, Moscow
- Y. Yamazaki
KEK/JAEA, Ibaraki-Ken
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An ACS (Annular Coupled Structure) cavity has been developed for the J-PARC Linac from 190-MeV to 400-MeV. We fabricated a buncher module with two 5-cell accelerating tanks and one 5-cell bridge tank as the first module. The buncher module is shorter than accelerating module that consists of two 17-cell accelerating tanks and one 9-cell bridge tank. The first buncher module achieved the stable operation of 50 Hz, 600 us, 600 kW in the high-power test, which corresponds to the E0 value of 4.8 MV/m. The second buncher module and three accelerating modules are under fabrication continuously. These results of the frequency tuning and assembling are presented in detail.
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| THPAN038 |
Generation and Acceleration of High Brightness Electron Bunch Train in ATF of KEK
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3312 |
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- S. Liu, S. Araki, M. K. Fukuda, M. Takano, N. Terunuma, J. Urakawa
KEK, Ibaraki
- K. Hirano
NIRS, Chiba-shi
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Laser Undulator Compact X-ray source (LUCX) is a test bench for compact high brightness X-ray generator at KEK in order to demonstrate the possibility on K-edge digital subtraction angiography, based on the Compton Scattering. For this project, one of the challenging problems is to generate and accelerate high brightness multi-bunch electron beams, compensating the energy difference due to beam loading effect. In this paper, we calculate the transient beam loading voltage and energy gain from RF field in standing wave gun cavity and traveling wave accelerating tube for multi-bunch train, considering the process of propagation, buildup of RF field in them and the special RF pulse shape. We generated and accelerated 100 bunch electron beam train with 50nC, which beam loading effect was compensated effectively by adjusting the laser injection timing. By BPM and OTR system, we measured the electron beam energy bunch by bunch. The average energy of 100 bunch train is 40.5MeV and maximum energy difference bunch to bunch is 0.26MeV, the relative energy spread of single bunch is about 0.13%. The transverse emittance can be optimized roughly to 3.6 pimm.mrad.
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