| Paper |
Title |
Page |
| MOPAN043 |
Beam Charge Feedback System for Thermionic Cathode RF-Gun
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254 |
| |
- H. Ohgaki, T. Kii, K. Masuda, T. Yamazaki, K. Yoshikawa, H. Zen
Kyoto IAE, Kyoto
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A beam current feedback system to stabilize the long-time operation of thermionic cathode RF-Gun has been developed in Kyoto University FEL facility where a 4.5-cell thermionic cathode RF-gun provides electron beam to drive a mid-infrared free electron laser. However, the back-bomberdment effect seriously increases the temperature of the cathode surface, and thus the stable operation was quit difficult without continuous control of the cathode temperature or the beam current. We have tried to stabilize the beam current by using a feedback system. The beam current was monitored with current transformer, which was located at the exit of the gun or at the downstream of the energy analyzer, was read by oscilloscope. The total charge was calculated in a PC and the LabView PID-unit controlled the cathode heater current. As a result, the long term stability of the beam current dramatically improved.
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| TUPMN047 |
W-band Electromagnetic Wave Undulator for AIST 800 MeV Electron Storage Ring TERAS
|
1025 |
| |
- H. Toyokawa, R. Kuroda
AIST, Tsukuba, Ibaraki
- H. Ohgaki
Kyoto IAE, Kyoto
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An electromagnetic-wave undulator based on a quasi-optical resonator operated in higher order TE mode is proposed to generate monochromatic X-rays. We plan to install it to an 800MeV electron storage ring TERAS of AIST. Mode propagation in the resonator was analysed with an electromagnetic-wave simulation code MAFIA and HFSS. Design parameters for the undulator operated in W-band (95 GHz) was presented. The peak electric field along the electron orbit was estimated to be 130 kV/m when we fed 1 kW of 95 GHz electromagnetic wave. The estimated X-ray flux density was 1 x 1011 photons/sec/mrad2/A for 3.4 keV X-rays.
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| THPAN044 |
Global COD Correction of SAGA-LS Storage Ring
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3327 |
| |
- H. Ohgaki
Kyoto IAE, Kyoto
- Y. Iwasaki, T. Tomimasu
SAGA, Tosu
- S. Koda, Y. Takabayashi, K. Yoshida
Saga Synchrotron Light Source, Industry Promotion Division, Saga City
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SAGA Light Source is a medium size light source which has been operated from February, 2006. The stored beam orbit has been corrected by a closed orbit correction system consisted of 24 beam position monitors, 40 steering magnets and PC-LabView based control system. The singular value decomposition method has been applied for the global COD correction by using a measured response matrix. As a result, the standard deviation of the orbit error around the ring was reduced to 20 micro-meters both for horizontal plane and for vertical plane, respectively.
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