Phase Locking the Spin Precession in a Storage Ring

N Hempelmann; V Hejny; J Pretz; E Stephenson; W Augustyniak; Z Bagdasarian; M Bai; L Barion; M Berz; S Chekmenev; G Ciullo; S Dymov; F-J Etzkorn; D Eversmann; M Gaisser; R Gebel; K Grigoryev; D Grzonka; G Guidoboni; T Hanraths; D Heberling; J Hetzel; F Hinder; A Kacharava; V Kamerdzhiev; I Keshelashvili; I Koop; A Kulikov; A Lehrach; P Lenisa; N Lomidze; B Lorentz; P Maanen; G Macharashvili; A Magiera; D Mchedlishvili; S Mey; F Müller; A Nass; N N Nikolaev; A Pesce; D Prasuhn; F Rathmann; M Rosenthal; A Saleev; V Schmidt; Y Semertzidis; V Shmakova; A Silenko; J Slim; H Soltner; A Stahl; R Stassen; H Stockhorst; H Ströher; M Tabidze; G Tagliente; R Talman; P Thörngren Engblom; F Trinkel; Yu Uzikov; Yu Valdau; E Valetov; A Vassiliev; C Weidemann; A Wrońska; P Wüstner; P Zuprański; M Żurek; JEDI Collaboration

doi:10.1103/PhysRevLett.119.014801

Phase Locking the Spin Precession in a Storage Ring

Phys Rev Lett. 2017 Jul 7;119(1):014801. doi: 10.1103/PhysRevLett.119.014801. Epub 2017 Jul 5.

Authors

N Hempelmann^{1

2}, V Hejny², J Pretz^{1

2

3}, E Stephenson⁴, W Augustyniak⁵, Z Bagdasarian^{2

6}, M Bai^{2

3}, L Barion⁷, M Berz⁸, S Chekmenev¹, G Ciullo⁷, S Dymov^{2

9}, F-J Etzkorn², D Eversmann¹, M Gaisser^{1

10}, R Gebel², K Grigoryev¹, D Grzonka², G Guidoboni⁷, T Hanraths², D Heberling^{3

11}, J Hetzel², F Hinder^{1

2}, A Kacharava², V Kamerdzhiev², I Keshelashvili², I Koop¹², A Kulikov⁹, A Lehrach^{1

2

3}, P Lenisa⁷, N Lomidze⁶, B Lorentz², P Maanen¹, G Macharashvili^{6

9}, A Magiera¹³, D Mchedlishvili^{2

6}, S Mey^{1

2}, F Müller^{1

2}, A Nass², N N Nikolaev^{14

15}, A Pesce⁷, D Prasuhn², F Rathmann², M Rosenthal^{1

2}, A Saleev^{2

16}, V Schmidt^{1

2}, Y Semertzidis^{10

17}, V Shmakova⁹, A Silenko^{18

19}, J Slim¹¹, H Soltner²⁰, A Stahl^{1

3}, R Stassen², H Stockhorst², H Ströher^{2

3}, M Tabidze⁶, G Tagliente²¹, R Talman²², P Thörngren Engblom²³, F Trinkel^{1

2}, Yu Uzikov⁹, Yu Valdau^{24

25}, E Valetov⁸, A Vassiliev²⁵, C Weidemann⁷, A Wrońska¹³, P Wüstner²⁶, P Zuprański⁵, M Żurek²; JEDI Collaboration

Affiliations

¹ III. Physikalisches Institut B, RWTH Aachen University, 52056 Aachen, Germany.
² Institut für Kernphysik, Forschungszentrum Jülich, 52425 Jülich, Germany.
³ JARA-FAME (Forces and Matter Experiments), Forschungszentrum Jülich and RWTH Aachen University, 52056 Aachen, Germany.
⁴ Indiana University Center for Spacetime Symmetries, Bloomington, Indiana 47405, USA.
⁵ Department of Nuclear Physics, National Centre for Nuclear Research, 00681 Warsaw, Poland.
⁶ High Energy Physics Institute, Tbilisi State University, 0186 Tbilisi, Georgia.
⁷ University of Ferrara and INFN, 44100 Ferrara, Italy.
⁸ Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA.
⁹ Laboratory of Nuclear Problems, Joint Institute for Nuclear Research, 141980 Dubna, Russia.
¹⁰ Center for Axion and Precision Physics Research, Institute for Basic Science (IBS), Daejeon 34141, Republic of Korea.
¹¹ Institut für Hochfrequenztechnik, RWTH Aachen University, 52056 Aachen, Germany.
¹² Budker Institute of Nuclear Physics, 630090 Novosibirsk, Russia.
¹³ Institute of Physics, Jagiellonian University, 30348 Cracow, Poland.
¹⁴ L.D. Landau Institute for Theoretical Physics, 142432 Chernogolovka, Russia.
¹⁵ Moscow Institute for Physics and Technology, 141700 Dolgoprudny, Russia.
¹⁶ Samara National Research University, 443086 Samara, Russia.
¹⁷ Research Institute for Nuclear Problems, Belarusian State University, 220030 Minsk, Belarus.
¹⁸ Department of Physics, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea.
¹⁹ Bogoliubov Laboratory of Theoretical Physics, Joint Institute for Nuclear Research, 141980 Dubna, Russia.
²⁰ Zentralinstitut für Engineering, Elektronik und Analytik (ZEA-1), Forschungszentrum Jülich, 52425 Jülich, Germany.
²¹ INFN, 70125 Bari, Italy.
²² Cornell University, Ithaca, New York 14850, USA.
²³ Department of Physics, KTH Royal Institute of Technology, SE-10691 Stockholm, Sweden.
²⁴ Helmholtz-Institut für Strahlen- und Kernphysik, Universität Bonn, 53115 Bonn, Germany.
²⁵ Petersburg Nuclear Physics Institute, 188300 Gatchina, Russia.
²⁶ Zentralinstitut für Engineering, Elektronik und Analytik (ZEA-2), Forschungszentrum Jülich, 52425 Jülich, Germany.

PMID: 28731757
DOI: 10.1103/PhysRevLett.119.014801

Abstract

This Letter reports the successful use of feedback from a spin polarization measurement to the revolution frequency of a 0.97 GeV/c bunched and polarized deuteron beam in the Cooler Synchrotron (COSY) storage ring in order to control both the precession rate (≈121 kHz) and the phase of the horizontal polarization component. Real time synchronization with a radio frequency (rf) solenoid made possible the rotation of the polarization out of the horizontal plane, yielding a demonstration of the feedback method to manipulate the polarization. In particular, the rotation rate shows a sinusoidal function of the horizontal polarization phase (relative to the rf solenoid), which was controlled to within a 1 standard deviation range of σ=0.21 rad. The minimum possible adjustment was 3.7 mHz out of a revolution frequency of 753 kHz, which changes the precession rate by 26 mrad/s. Such a capability meets a requirement for the use of storage rings to look for an intrinsic electric dipole moment of charged particles.