Experimental Safe Extremum Seeking for Accelerators

被引：1

作者：

Williams, Alan ^{[1
,2
]}

Scheinker, Alexander ^{[3
]}

Huang, En-Chuan ^{[3
]}

Taylor, Charles ^{[3
]}

Krstic, Miroslav ^{[1
]}

机构：

[1] Univ Calif San Diego, Dept Mech & Aerosp Engn, San Diego, CA 92093 USA

[2] Los Alamos Natl Lab, Accelerator Operat Technol Appl Electrodynam AOT, Los Alamos, NM 87544 USA

[3] Los Alamos Natl Lab AOT AE, Los Alamos, NM 87544 USA

来源：

IEEE TRANSACTIONS ON CONTROL SYSTEMS TECHNOLOGY | 2024年 / 32卷 / 05期

关键词：

Particle beams; Tuning; Safety; Particle accelerators; Optimization; Heuristic algorithms; Linear particle accelerator; particle accelerators; particle beam handling; robust control; safety; time-varying systems;

D O I：

10.1109/TCST.2024.3377828

中图分类号：

TP [自动化技术、计算机技术];

学科分类号：

0812 ;

摘要：

We demonstrate the recent designs of safe extremum seeking (Safe ES) on the 1-km-long charged particle accelerator at the Los Alamos Neutron Science Center (LANSCE). Safe ES is a modification of extremum seeking (ES) which, in addition to minimizing an analytically unknown cost, also employs a safety filter based on an analytically unknown control barrier function (CBF) safety metric. Tuning is necessitated by accelerators being large complex systems, with many drifting parameters due to thermal effects and degradation. At the same time, safe operation (the maintenance of state constraints) is crucial, as damage brings astronomical costs, both financially and in operation downtime. Our measured (but analytically unknown) safety metric is the beam current. We perform multivariable Safe ES on three accelerator applications, in which we adapt 4, 6, and 3 magnet strength parameters, respectively. Two of the three applications are for validated simulation models of beamlines at LANSCE: the first for the proton radiography (pRad) beamline of 800-MeV protons for spot size tuning; the second on a high-performance code, HPSim, for tuning the low-energy beam transport (LEBT) region that contains a beam of 750-keV protons. The third is an experimental tuning of the steering magnets in the LEBT at LANSCE.

引用

页码：1881 / 1890

页数：10

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