Application of disturbance observer-based control on pulsed superconducting radio frequency cavities

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Application of disturbance observer-based control on pulsed superconducting radio frequency cavities

Feng Qiu, Takako Miura, Dai Arakawa, Nao Higashi, Yosuke Honda, Eiji Kako, Toshihiro Matsumoto, Shinichiro Michizono, Tsukasa Miyajima, Takashi Obina, Hiroshi Sakai, Kensei Umemori, and Masahiro Yamamoto

Phys. Rev. Accel. Beams 24, 012804 – Published 28 January 2021

Abstract

A disturbance observer (DOB)-based control approach was verified using the low-level radio-frequency systems of superconducting (SC) cavities operated in a continuous wave (CW) mode in a compact energy recovery linac (cERL) at KEK. This approach compensates for both predictable and unpredictable disturbances in a radio frequency (rf) system such as beam loading, Lorentz force detuning, and microphonics. This paper generalizes the DOB method in pulsed SC rf systems in the cERL at KEK. The results show that the pulse-to-pulse stabilities of the rf system are improved as expected by using this control approach. Furthermore, this method is validated by successfully compensating long pulse beam-loading effects in cERL.

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Received 25 September 2020
Accepted 8 January 2021

DOI:https://doi.org/10.1103/PhysRevAccelBeams.24.012804

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.

Published by the American Physical Society

Physics Subject Headings (PhySH)

Beam control Radio frequency power sources Superconducting RF

Accelerators & Beams

Authors & Affiliations

Feng Qiu ^1,2,*,†, Takako Miura^1,2, Dai Arakawa¹, Nao Higashi ^1,2, Yosuke Honda ^1,2, Eiji Kako ^1,2, Toshihiro Matsumoto^1,2, Shinichiro Michizono^1,2, Tsukasa Miyajima^1,2, Takashi Obina^1,2, Hiroshi Sakai ^1,2, Kensei Umemori ^1,2, and Masahiro Yamamoto ^1,2

¹High Energy Accelerator Research Organization, 1–1 Oho, Tsukuba, Ibaraki 305–0801, Japan
²The Graduate University for Advanced Studies, Shonan Village, Hayama, Kanagawa 240–0193, Japan

^*qiufeng@impcas.ac.cn
^†Present address: Institute of Modern Physics, Chinese Academy of Sciences, China.

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Issue

Vol. 24, Iss. 1 — January 2021

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