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| URL | https://doi.org/10.18429/JACoW-ICALEPCS2025-TUPD097 |
|---|---|
| Title | Vacuum monitoring and controls acceptance testing for LCLS-II HE cryomodules at SLAC |
| Authors |
|
| Abstract | The LCLS-II High Energy (LCLS-II HE) upgrade at SLAC National Accelerator Laboratory involves the delivery and long-term storage of superconducting cryomodules, manufactured at partner laboratories and shipped to SLAC. To maintain their performance, these cryomodules must preserve ultra-high vacuum (UHV) conditions prior to installation. Upon arrival, each unit undergoes a comprehensive controls acceptance test to validate instrumentation functionality, including sensor accuracy, signal integrity, and system connectivity. To ensure vacuum integrity during extended storage, a vacuum monitoring system was developed to continuously track cold cathode gauge pressure, integrated into the EPICS control system for real-time data, alarms, and archiving. Despite using a single gauge per cryomodule, the system enables early detection of vacuum degradation with minimal hardware. This paper outlines the acceptance testing, vacuum monitoring system design, and operational experiences, along with data trends, alarm scenarios, and lessons learned to improve future cryomodule storage practices. |
| Paper | download: TUPD097.pdf |
| Cite | BibTeX, LaTeX, Text/Word, RIS, EndNote |
| Conference | 20th Int. Conf. Accel. Large Exp. Phys. Control Syst. (ICALEPCS'25) |
| Series | |
| Location | Chicago, IL, USA |
| Date | 20-26 Sep 2025 |
| Publisher | JACoW Publishing, Geneva, Switzerland |
| Editorial Board | Kent Wootton (ANL), Jeffery Biss (FNAL), Gustavo Bruno (ANL), Jeff Kirchman (ANL), Kelly Jaje (ANL), Denise Skiadopoulos (ANL), SuYin Grass Wang (ANL) |
| Online ISBN | 978-3-95450-255-4 |
| Online ISSN | 2226-0358 |
| Received | 06 September 2025 |
| Revised | 23 September 2025 |
| Accepted | 27 October 2025 |
| Issued | 25 November 2025 |
| DOI | 10.18429/JACoW-ICALEPCS2025-TUPD097 |
| Pages | 719-723 |
| Copyright | Published by JACoW Publishing under the terms of the Creative Commons Attribution 4.0 license. Any further distribution of this work must maintain attribution to the author(s), the published article's title, publisher, and DOI. |