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Title |
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| TUP025 |
Beam-Size Measurement System at the SAGA-LS Storage Ring
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140 |
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- Y. Takabayashi, Y. Iwasaki, T. Kaneyasu, S. Koda
SAGA, Tosu
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The SAGA Light Source (SAGA-LS) accelerator consists of 260-MeV injector linac and 1.4-GeV storage ring, and it started a user-mode operation in 2006. In order to measure the size of the stored electron beam, we adopted a synchrotron radiation interferometer, which was invented at KEK-PF about fifteen years ago. In this method, the beam size can be obtained from the contrast (visibility) of interferogram of the synchrotron (visible) light passed through a double slit. Our measurement system consists of a double slit, achromatic lens, ND filter, magnification lens, polarization filter, band-pass filter, and CCD camera. The image of the interferogram was acquired through a frame grabber board in a Windows PC (server). The software was developed on LabVIEW. The interferogram was fitted to a theoretical equation and then the visibility was extracted. The beam size obtained is displayed on a console PC (client) in the control room every 1 s. The client-server system employs the ActiveX CA protocol. This measurement system is useful for the diagnosis of the beam status and the control of the betatron coupling.
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| TUP098 |
Present Status of the SAGA-LS Control System
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307 |
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- T. Kaneyasu, Y. Iwasaki, S. Koda, Y. Takabayashi
SAGA, Tosu
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SAGA Light Source (SAGA-LS) is a synchrotron radiation facility consisting of a 255 MeV injector linac and a 1.4 GeV electron storage ring with a circumference of 75.6 m. The SAGA-LS has been stably providing synchrotron light, ranging from VUV to hard x-rays, with users since February 2006. For the control of the SAGA-LS accelerators, a simple PC-LabView based system which uses the EPICS channel access (ActiveX CA) as a communication protocol is utilized. The control system was designed to meet requirements for high reliability, cost-effectiveness and easy maintenance and upgrade. The system consists of off-the-shelf IO devices connected to local server PCs (CA servers), console PCs (CA clients) and Ethernet LAN. Both the server and client applications are developed in LabView because of its easiness for in-house software modification and development along with the machine improvements. Up to now about 2,000 process variables have been employed to control accelerator components such as magnet power supplies, an RF system, vacuum monitors, beam diagnostic systems and insertion devices.
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