Maintaining a resonance condition of an rf spin rotator through a feedback loop in a storage ring

This paper presents the successful application of a phase-lock feedback system to maintain the resonance condition of a radio frequency (rf) spin rotator (specifically, an rf Wien filter) with respect to a 120 kHz spin precession in the Cooler Synchrotron (COSY) storage ring. Real-time monitoring of the spin precession and the rf Wien filter signal allows the relative phase between the two to be stabilized at an arbitrary setpoint. The feedback system compensates for deviations in the relative phase by adjusting the frequency and/or phase of the rf device as needed. With this method, a variation in the phase relative to the demanded value with a standard deviation of <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mrow><a:msub><a:mrow><a:mi>σ</a:mi></a:mrow><a:mrow><a:mi mathvariant="normal">Δ</a:mi><a:mi>φ</a:mi></a:mrow></a:msub><a:mo>≈</a:mo><a:mn>0.2</a:mn><a:mtext> </a:mtext><a:mtext> </a:mtext><a:mi>rad</a:mi></a:mrow></a:math> could be achieved. The system was implemented in two runs aiming at a first direct measurement of the deuteron electric dipole moment in 2018 and 2021. In addition, the difference between a single-bunch beam affected by the spin rotator and a two-bunch system in which only one bunch is exposed to the spin rotator fields is discussed. Both methods have been used during these beam times. The ability to keep the spin precession and the rf fields synchronized is crucial for future investigations of electric dipole moments of charged particles using storage rings.

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Publication Details

Journal
Physical Review Accelerators and Beams
Published
2025-06-03
DOI
https://doi.org/10.1103/physrevaccelbeams.28.062801
Citations
1
Primary Topic
Magnetic properties of thin films
Type
article
Field-Weighted Citation Impact
1.25

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Maintaining a resonance condition of an rf spin rotator through a feedback loop in a storage ring

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Magnetic properties of thin films
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article

Maintaining a resonance condition of an rf spin rotator through a feedback loop in a storage ring

Helmut Soltner, V. Kamerdzhiev, I. Keshelashvili, Alfonso Piccoli, J. Pretz, A. Aksentev, F. Abusaif, Rahul Shankar, N. N. Nikolaev, Alexander J. Silenko, D. Mchedlishvili, B. Breitkreutz, M. Żurek, A. Wirzba, P. Lenisa, V. Shmakova, R. Stassen, A. Nass, E. J. Stephenson, Yu. Valdau, J. Slim, S. Karanth, L. Barion, A. Saleev, M. Beyß, B. Lorentz, G. Macharashvili, Analía Pesce, M. Vitz, K. Grigoryev, F. Müller, A. Magiera, S. Dymov, V. Poncza, A. Kononov, O. Javakhishvili, A. Andres, N.-O. Fröhlich, D. Shergelashvili, V. Hejny, M. Gaißer, Tim Wagner, K. Laihem, D. Grzonka, F. Rathmann, N. Lomidze, J. C. Barrière, G. Tagliente, A. Aggarwal, A. Melnikov, R. Gebel, A. Kacharava, N. Canale, Nikolay Shurkhno, J. Hetzel, B. Alberdi, D. Prasuhn, A. Lehrach, C. Böhme, M. Tabidze, G. Ciullo, S. Siddique, A. Wrońska, P. Wüstner, H. Ströher, D. Okropiridze
article en
1 citations

Abstract

This paper presents the successful application of a phase-lock feedback system to maintain the resonance condition of a radio frequency (rf) spin rotator (specifically, an rf Wien filter) with respect to a 120 kHz spin precession in the Cooler Synchrotron (COSY) storage ring. Real-time monitoring of the spin precession and the rf Wien filter signal allows the relative phase between the two to be stabilized at an arbitrary setpoint. The feedback system compensates for deviations in the relative phase by adjusting the frequency and/or phase of the rf device as needed. With this method, a variation in the phase relative to the demanded value with a standard deviation of <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mrow><a:msub><a:mrow><a:mi>σ</a:mi></a:mrow><a:mrow><a:mi mathvariant="normal">Δ</a:mi><a:mi>φ</a:mi></a:mrow></a:msub><a:mo>≈</a:mo><a:mn>0.2</a:mn><a:mtext> </a:mtext><a:mtext> </a:mtext><a:mi>rad</a:mi></a:mrow></a:math> could be achieved. The system was implemented in two runs aiming at a first direct measurement of the deuteron electric dipole moment in 2018 and 2021. In addition, the difference between a single-bunch beam affected by the spin rotator and a two-bunch system in which only one bunch is exposed to the spin rotator fields is discussed. Both methods have been used during these beam times. The ability to keep the spin precession and the rf fields synchronized is crucial for future investigations of electric dipole moments of charged particles using storage rings.

Physical Review Accelerators and BeamsVol. 28(6)
Tbilisi State University (GE), Jagiellonian University (PL), Istituto Nazionale di Fisica Nucleare (IT), GSI Helmholtz Centre for Heavy Ion Research (DE), Forschungszentrum Jülich (DE), Landau Institute for Theoretical Physics (RU), University of Ferrara (IT), Joint Institute for Nuclear Research (RU), Institute of Physics (PL), Institute for Nuclear Research (RU), Istituto Nazionale di Fisica Nucleare, Sezione di Bari (IT), Agricultural University of Georgia (GE), Indiana University Bloomington (US), Indiana University (US), RWTH Aachen University (DE)
Strong, European Commission, Russian Science Foundation, Horizon 2020 Framework Programme
Openalex Percentile: Top 21%
Magnetic properties of thin films
1.25
DOIOpen Access PDFOpenAlex
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