Life Expectancy Studies for LCLS-II Permanent Magnet Undulators
| Autor: | Santana-Leitner, Mario, Bruch, Daniel, Field, R., Martinez-Galarce, Dennis, McKee, Bobby, Nuhn, Heinz-Dieter, Rowen, Michael, Score, Steve |
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| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: | |
| DOI: | 10.18429/jacow-ipac2017-tupab134 |
| Popis: | LCLSII at SLAC National Accelerator Laboratory will add a 4 GeV superconducting Linac to the existing 20 GeV Cu structure. Electron beams from the two sources going through two new variable gap undulators [*] will produce FEL ranging 200-5000 keV at up to 929 kHz, also reaching 20 keV at low frequency. Such performance will be achieved by hybrid design undulators 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 result excessive if too frequent or not detected and aborted fast enough. A model of SXR undulator was set for FLUKA [**] radiation transport, including 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, interception at wire scanners and gas-bremsstrahlung interactions. Results help set limits on shut-off times, uniform loss levels and wire scanner use, and to define placement for beam loss monitors. Proceedings of the 8th Int. Particle Accelerator Conf., IPAC2017, Copenhagen, Denmark |
| Databáze: | OpenAIRE |
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