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Selcuk, Haciomeroglu
액시온 및 극한상호작용 연구단
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Real-time sextupole tuning for a long in-plane polarization at storage rings

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Title
Real-time sextupole tuning for a long in-plane polarization at storage rings
Author(s)
Selcuk Hacıömeroğlu
Subject
Polarized beam, ; Storage ring, ; Sextupole fields, ; Real-time tuning, ; PID controller
Publication Date
2020-12
Journal
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, v.982, pp.164550
Publisher
ELSEVIER SCIENCE BV
Abstract
© 2020 Elsevier B.V. A long in-plane beam polarization can be a desired feature for spin measurement experiments in storage rings. The spin precession of the particles within a beam can be controlled by means of the frozen spin method and beam bunching via RF cavities, eventually yielding a polarization lifetime of 10-100 s. Previous studies have shown that it can be further improved by sextupoles, which correct the second order effects related to the chromaticity of the beam. However, sextupoles can require readjustment after slight changes in ring parameters. This work presents a real-time sextupole tuning method that relies on a feedback algorithm. It adjusts the sextupole strength during storage, targeting a zero average radial spin component. Satisfying this condition results in a longer polarization lifetime. Simulation studies show that roughly determined feedback coefficients in this method work effectively for a wide range of ring parameters, with practical field imperfections and measurement errors taken into account. Alternatively, this technique can be used to optimize sextupole strengths in a test run without intervening the measurement
URI
https://pr.ibs.re.kr/handle/8788114/7514
DOI
10.1016/j.nima.2020.164550
ISSN
0168-9002
Appears in Collections:
Center for Axion and Precision Physics Research(액시온 및 극한상호작용 연구단) > 1. Journal Papers (저널논문)
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