Journal Article

FZJ-2025-02878

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Maintaining a resonance condition of an rf spin rotator through a feedback loop in a storage ring

Hejny, V. (Corresponding author)FZJ* ; Andres, A.FZJ* ; Pretz, J.FZJ* ; Abusaif, F. ; Aggarwal, A. ; Aksentev, A. ; Alberdi, B. ; Barion, L. ; Bekman, I.FZJ* ; Beyß, M. ; Böhme, C.FZJ* ; Breitkreutz, B. ; Canale, N. ; Ciullo, G. ; Dymov, S. ; Fröhlich, N.-O. ; Gebel, R.FZJ* ; Gaisser, M. ; Grigoryev, K.FZJ* ; Grzonka, D.FZJ* ; Hetzel, J.FZJ* ; Javakhishvili, O. ; Kacharava, A.FZJ* ; Kamerdzhiev, V. ; Karanth, S. ; Keshelashvili, I.FZJ* ; Kononov, A. ; Laihem, K. ; Lehrach, A.FZJ* ; Lenisa, P. ; Lomidze, N. ; Lorentz, B. ; Macharashvili, G. ; Magiera, A. ; Mchedlishvili, D. ; Melnikov, A. ; Müller, F. ; Nass, A.FZJ* ; Nikolaev, N. N. ; Okropiridze, D.FZJ* ; Pesce, A. ; Piccoli, A. ; Poncza, V. ; Prasuhn, D. ; Rathmann, F.FZJ* ; Saleev, A. ; Shergelashvili, D. ; Shmakova, V. ; Shankar, R. ; Shurkhno, N. ; Siddique, S. ; Silenko, A. ; Slim, J. ; Soltner, H.FZJ* ; Stassen, R.FZJ* ; Stephenson, E. J. ; Stroeher, H.FZJ* ; Tabidze, M. ; Tagliente, G. ; Valdau, Y. ; Vitz, M. ; Wagner, T. ; Wirzba, A.FZJ* ; Wrońska, A. ; Wüstner, P.FZJ* ; Żurek, M.

2025
American Physical Society College Park, MD

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Please use a persistent id in citations: doi:10.1103/PhysRevAccelBeams.28.062801  doi:10.34734/FZJ-2025-02878

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 𝜎Δ⁢𝜑≈0.2  rad 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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Contributing Institute(s):

1. Experimentelle Hadrondynamik (IKP-2)
2. Experimentelle Hadronstruktur (IKP-1)
3. Kernphysikalische Großgeräte (IKP-4)
4. IKP- Technische und Administrative Infrastruktur (IKP-TA)
5. Theorie der Starken Wechselwirkung (IAS-4)
6. Zentralinstitut für Elektronik (ZEA-2)
7. Zentralinstitut für Technologie (ZAT)

Research Program(s):

1. 613 - Matter and Radiation from the Universe (POF4-613) (POF4-613)
2. 621 - Accelerator Research and Development (POF4-621) (POF4-621)
3. srEDM - Search for electric dipole moments using storage rings (694340) (694340)

Experiment(s):

1. Jülich Electric Dipole moment Investigations

Appears in the scientific report 2025

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Database coverage:
; ; ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; DOAJ Seal ; Essential Science Indicators ; IF < 5 ; JCR ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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