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Sato, I.

Paper Title Page
MOP110 Precise Control of Cooling Water System for Stabilization of 125 MeV Linac at LEBRA 331
  • T. Sakai, M. Inagaki, T. Kuwada, I. Sato
    Nihon University, Advanced Research Institute for the Sciences and Humanities, Funabashi
  • K. Hayakawa, Y. Hayakawa, K. Nakao, K. Nogami, Y. Takahashi, T. Tanaka
    LEBRA, Funabashi

The 125 MeV linac at Laboratory for Electron Beam Research and Application (LEBRA) in Nihon University has been used for generation of the near-infrared FEL and the Parametric X-ray Radiation (PXR). Currently the FELs from 0.86 to 6 microns and the PXR X-rays from 5 to 20 keV are available at LEBRA. Precise experiments using the light sources require a high stability in both the wavelength and the intensity of the lights. Though the linac was operated with the cooling water stabilized at 30 plus or minus 0.2 deg C, periodical fluctuation of the electron beam energy and the beam orbit suggested that the stability of the cooling water temperature was not sufficient. With this condition a large fluctuation (plus or minus 15%) was observed for the PXR intensity. After the improvement of the fine cooling water system and the water flow path, fluctuation of the cooling water temperature at the supply head of the accelerating tubes and the electromagnets was suppressed to within plus or minus 0.01 deg C. As a result of the improvement the PXR intensity fluctuation at the X-ray output port has been suppressed to within plus or minus 2% for the operation over several hours.