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| URL | https://doi.org/10.18429/JACoW-ICALEPCS2025-WEPD041 |
|---|---|
| Title | Control system design for the new SMH16 pulsed current generator in the CERN PS extraction system |
| Authors |
|
| Abstract | The existing direct-drive septum magnet (PE.SMH16), in operation since 1994, is reaching the end of its lifetime under increased extraction frequency and will be replaced by a new eddy-current septum magnet, requiring a redesigned 30 kA pulsed generator. To meet the demanding flat-top stability requirement of ±0.05% over an 11 µs window and ±0.05% pulse-to-pulse repeatability over a year, a dedicated regulation control system was developed and validated. The objective of this work is to demonstrate that the control system achieves the required closed-loop performance, delivering repeatable magnet current waveforms under representative test bench conditions. The control system employs real-time regulation of flat-top amplitude and flatness, supported by a thermally stabilized enclosure to mitigate acquisition drift. Measurements confirm that the closed-loop system consistently maintained flatness requirement over an 8 µs window, with long-term repeatability and all observed deviations, including spurious glitches up to 400 ppm, remaining within specification. The restriction of 8 µs stems from test-bench limitations rather than control capability, which is discussed in detail. These results show that the regulation system fulfils its role up to specification; final confirmation of absolute flat-top accuracy will come from further qualification of acquisition chain elements in a dedicated test campaign, followed by beam-based validation in operation. |
| Paper | download: WEPD041.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 | 05 September 2025 |
| Revised | 22 September 2025 |
| Accepted | 30 October 2025 |
| Issued | 25 November 2025 |
| DOI | 10.18429/JACoW-ICALEPCS2025-WEPD041 |
| Pages | 1127-1131 |
| 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. |