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SLAC Publication: SLAC-PUB-16983
SLAC Release Date: May 25, 2017
LIFE EXPECTANCY STUDIES FOR LCLS-II PERMANENT MAGNET UNDULATORS
Santana Leitner, Mario.
LCLS-II at SLAC National Accelerator Laboratory will add a 4 GeV superconducting Linac to the existing 20 GeV copper structure. Electron beams from the two sources going through two new variable gap undulators will produce FEL from 200 keV to 5000 keV at up to 929 kHz, also reaching 20 keV at low frequency. Such performance will be achieved by hybrid design un- dulators with NdFeB magnet blocks until radiation-induced demagnetization exceeds 0.01 %. This is a sizable challenge, as LCLS-II will ... Show Full Abstract
LCLS-II at SLAC National Accelerator Laboratory will add a 4 GeV superconducting Linac to the existing 20 GeV copper structure. Electron beams from the two sources going through two new variable gap undulators will produce FEL from 200 keV to 5000 keV at up to 929 kHz, also reaching 20 keV at low frequency. Such performance will be achieved by hybrid design un- dulators with NdFeB magnet blocks until radiation-induced demagnetization exceeds 0.01 %. This is a sizable challenge, as LCLS-II will carry 120 kW beams in both its soft (SXR) and hard (HXR) beam-lines. Even small fractional losses could be excessive if too frequent or not detected and aborted fast enough. A model of SXR undulator was set for FLUKA [1, 2] radiation transport, including the segments, phase-shifters, quadrupoles, RFBPM, stands/pillars and interconnecting parts. Components were installed according to MAD files, which were also used to code the optics. Beam-loss/shower propagation was simulated for beam mis-steering, halo in- teractions and beam interception at wire scanners. Results help set limits on shut-off times, uniform loss levels and wire scanner use. Show Partial Abstract
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  • Interest Categories: Accelerator Physics, Accelerator (control systems), X-Ray Free Electron Laser