WG5006
JASRI/SPring-8, Hyogo-ken, Japan
RIKEN SPring-8 Center, Sayo-cho, Sayo-gun, Hyogo, Japan
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WG5006 |
Availability of Optical Fiber Based Beam Loss Monitor at SACLA XFEL Facility | |
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| An optical fiber-based Cerenkov beam loss monitor (CBLM) has been developed as a real-time and long-range detection tool for the SPring-8 angstrom compact free electron laser (SACLA) in order to control electron beam losses. Based on the tests carried out at the 250 MeV SPring-8 Compact SASE Source (SCSS) prototype accelerator, large core (400 μm), long (>150 m) multimode fibers were selected and installed at the SACLA. We report the approach chosen to insure that the required sensitivity (≤ 1 pC) could be obtained over more than one hundred meters. A beam-based approach was used to characterize (attenuation, signal amplitude) different fibers (diameter, index profile, numerical aperture) and to select the most appropriate one. The results of the first few months of operation show that the SPring-8 CBLM has performed efficiently, with a detection limit below 1 pC per pulse across the 110 meters of the in-vacuum type undulators, and with a position accuracy of less than 1 m, and could be useful to apply to various electron accelerators especially in the tuning stage. | ||
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Slides WG5006 [1.183 MB] | |