| Title |
Commissioning the Beam-Loss Monitoring System of the LCLS Superconducting Linac |
| Authors |
- A.S. Fisher, N. Balakrishnan, G.W. Brown, E.P. Chin, W.G. Cobau, J.E. Dusatko, B.T. Jacobson, S. Kwon, J.A. Mock, J. Park, J. Pigula, E. Rodriguez, J.I.D. Rudolph, D. Sanchez, L. Sapozhnikov, J.J. Welch
SLAC, Menlo Park, California, USA
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| Abstract |
A 4-GeV superconducting linac has been added to the LCLS x-ray FEL facility at SLAC. Its 120-kW, 1-MHz beam requires new beam-loss monitors (BLMs) for radiation protection, machine protection, and diagnostics. Long radiation-hard optical fibres span the full 4 km from the electron gun of the SC linac to the final beam dump. Diamond detectors at anticipated loss points provide local protection. Detector signals are continuously integrated with a 500-ms time constant and compared to a loss threshold. If crossed, the beam is halted within 0.1 ms. Commissioning began in March 2022 with the 100-MeV injector and with RF processing of the cryomodules. At IBIC 2022 last September, we presented commissioning results from the injector BLMs. In October, the beam passed through the full linac and the bypass transport line above the LCLS copper linac, stopping at an intermediate dump. In August it continued through the soft x-ray undulator and achieved first lasing. Here we present BLM commissioning at energies up to 4 GeV and rates up to 100 kHz. We discuss measurements and software using the fast diagnostic-waveform output to localize beam losses and to detect wire-scanner signals.
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| Paper |
download TUP005.PDF [1.053 MB / 4 pages] |
| Poster |
download TUP005_POSTER.PDF [2.620 MB] |
| Cite |
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| Conference |
IBIC2023 |
| Series |
International Beam Instrumentation Conference (12th) |
| Location |
Saskatoon, Canada |
| Date |
10-14 September 2023 |
| Publisher |
JACoW Publishing, Geneva, Switzerland |
| Editorial Board |
Volker R.W. Schaa (GSI, Darmstadt, Germany); Tonia Batten (CLS, Saskatoon, Canada); Michael Bree (CLS, Saskatoon, Canada); Christine Petit-Jean-Genaz (CERN, Geneva, Switzerland); Darren Hunter (CLS, Saskatoon, Canada) |
| Online ISBN |
978-3-95450-236-3 |
| Online ISSN |
2673-5350 |
| Received |
06 September 2023 |
| Revised |
08 September 2023 |
| Accepted |
13 September 2023 |
| Issue Date |
27 September 2023 |
| DOI |
doi:10.18429/JACoW-IBIC2023-TUP005 |
| Pages |
187-190 |
| Copyright |
 Published by JACoW Publishing under the terms of the Creative Commons Attribution 4.0 International license. Any further distribution of this work must maintain attribution to the author(s), the published article's title, publisher, and DOI. |
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