JACoW is a publisher in Geneva, Switzerland that publishes the proceedings of accelerator conferences held around the world by an international collaboration of editors.
@inproceedings{fisher:ibic2022-tu2c3,
author = {A.S. Fisher and G.W. Brown and E.P. Chin and C.I. Clarke and W.G. Cobau and T. Frosio and B.T. Jacobson and R.A. Kadyrov and J.A. Mock and J. Park and E. Rodriguez and P.K. Roy and M. Santana-Leitner and J.J. Welch},
% author = {A.S. Fisher and G.W. Brown and E.P. Chin and C.I. Clarke and W.G. Cobau and T. Frosio and others},
% author = {A.S. Fisher and others},
title = {{Commissioning Beam-Loss Monitors for the Superconducting Upgrade to LCLS}},
& booktitle = {Proc. IBIC'22},
booktitle = {Proc. 11th Int. Beam Instrum. Conf. (IBIC'22)},
pages = {207--210},
eid = {TU2C3},
language = {english},
keywords = {gun, linac, cryomodule, electron, MMI},
venue = {Kraków, Poland},
series = {International Beam Instrumentation Conference},
number = {11},
publisher = {JACoW Publishing, Geneva, Switzerland},
month = {12},
year = {2022},
issn = {2673-5350},
isbn = {978-3-95450-241-7},
doi = {10.18429/JACoW-IBIC2022-TU2C3},
url = {https://jacow.org/ibic2022/papers/tu2c3.pdf},
abstract = {{Commissioning of the 4-GeV, 120-kW superconducting linac, an upgrade to the LCLS x-ray FEL at SLAC, began in summer 2022, by accelerating a beam through the first cryomodule to 100 MeV. This autumn the beam will accelerate along the full linac, pass through the bypass transport line above the copper linac, and end at a new high-power tune-up dump at the muon shield wall. The first beam through the undulators is expected by early 2023, at a rate well below the full 1 MHz. A new system of beam-loss detectors will provide radiation protection, machine protection, and diagnostics. Radiation-hard optical fibres span the full 4 km from the electron gun to the undulators and their beam dumps. Diamond detectors cover anticipated loss points. These replace ionization chambers previously used with the copper linac, due to concern about ion pile-up at high loss rates. Signals from the new detectors are integrated with a 500-ms time con-stant and compared to the allowed threshold. If this level is crossed, the beam stops within 0.2 ms. We report on the initial commissioning of this system and on the detection of losses of both photocurrent and of dark current from the gun and cryomodules.}},
}