Phase measurement for driven spin oscillations in a storage ring

N Hempelmann,D Grzonka,V Shmakova,I Keshelashvili,D Eversmann,Yu Valdau,P Lenisa,S Chekmenev,L Barion,V Kamerdzhiev,Z Bagdasarian,S Mey,G Ciullo,A Magiera,A Vassiliev,Y Senichev,P Maanen,A Saleev,V Hejny,F Trinkel,S Dymov,G Tagliente,J Pretz,D Prasuhn,A Nass,D Mchedlishvili,K Grigoryev,E J Stephenson ,Н Н Николаев ,M Nioradze,Greta Guidoboni ,A Kacharava,J Slim,R Gebel,M Gaißer ,W Augustyniak,H Stockhorst,I A Koop ,M Rosenthal,A Stahl,Yu N Uzikov ,A Pesce,J Hetzel,P Wüstner,G Macharashvili,Fabian Müller ,R Stassen,Christian Weidemann ,Y K Semertzidis ,A Lehrach,Dirk Heberling ,F Rathmann,Eremey Valetov ,Mei Bai ,B Lorentz,P Żuprański ,P Thörngren Engblom,M Tabidze,R Talman,H Ströher,M Żurek,N Lomidze,Martin Berz ,Fabian Hinder ,A Wrońska,А И Куликов ,Alexander J Silenko ,V Schmidt,H Soltner

doi:10.1103/physrevaccelbeams.21.042002

Abstract

This paper reports the first simultaneous measurement of the horizontal and vertical components of the polarization vector in a storage ring under the influence of a radio frequency (rf) solenoid. The experiments were performed at the Cooler Synchrotron COSY in Jülich using a vector polarized, bunched 0.97 GeV/c deuteron beam. Using the new spin feedback system, we set the initial phase difference between the solenoid field and the precession of the polarization vector to a predefined value. The feedback system was then switched off, allowing the phase difference to change over time, and the solenoid was switched on to rotate the polarization vector. We observed an oscillation of the vertical polarization component and the phase difference. The oscillations can be described using an analytical model. The results of this experiment also apply to other rf devices with horizontal magnetic fields, such as Wien filters. The precise manipulation of particle spins in storage rings is a prerequisite for measuring the electric dipole moment (EDM) of charged particles.1 MoreReceived 13 January 2018DOI:https://doi.org/10.1103/PhysRevAccelBeams.21.042002Published 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 SocietyPhysics Subject Headings (PhySH)Research AreasAccelerator/storage ring control systemsRadio frequency techniquesPropertiesPolarizationAccelerators & Beams

Highlights

This paper reports the first simultaneous measurement of the horizontal and vertical components of the polarization vector in a storage ring under the influence of a radio frequency solenoid
The experiments were performed at the Cooler Synchrotron COSY in Jülich using a vector polarized, bunched 0.97 GeV=c deuteron beam
Experiments with polarized beams play an important role in accelerator physics, in the search for an electric dipole moment (EDM) of charged elementary particles

Summary

Phase measurement for driven spin oscillations in a storage ring

N. Hempelmann,1,2 V. Hejny,2 J. Pretz,1,2,3,* H. Soltner,4 W. Augustyniak,5 Z. Bagdasarian,6,2 M. Bai,2,3 L. Barion,7 M. Berz,8 S. Chekmenev,1 G. Ciullo,7 S. Dymov,2,9 D. Eversmann,1 M. Gaisser,10,1 R. Gebel,2 K. Grigoryev,1 D. Grzonka,2 G. Guidoboni,7 D. Heberling,11,3 J. Hetzel,2 F. Hinder,1,2 A. Kacharava,2 V. Kamerdzhiev,2 I. Keshelashvili,2 I. Koop,12 A. Kulikov,9 A. Lehrach,2,3 P. Lenisa,7 N. Lomidze,6 B. Lorentz,2 P. Maanen,1 G. Macharashvili,6,9 A. Magiera,13 D. Mchedlishvili,6,2 S. Mey,1,2 F. Müller,1,2 A. Nass,2 N. N. Nikolaev,14,15 M. Nioradze,6 A. Pesce,7 D. Prasuhn,2 F. Rathmann,2 M. Rosenthal,1,2 A. Saleev,2,16 V. Schmidt,1,2 Y. Semertzidis,10,17 Y. Senichev,2 V. Shmakova,9 A. Silenko,18,19 J. Slim,11 A. Stahl,1,3 R. Stassen,2 E. Stephenson,20 H. Stockhorst,2 H. Ströher,2,3 M. Tabidze,6 G. Tagliente,21 R. Talman,22 P. Thörngren Engblom,23 F. Trinkel,1,2 Yu. Uzikov,9,24 Yu. Valdau,25,26 E. Valetov,8 A. Vassiliev,26 12Budker Institute of Nuclear Physics, 630090 Novosibirsk, Russia 13Institute of Physics, Jagiellonian University, 30348 Cracow, Poland 14L.D. Landau Institute for Theoretical Physics, 142432 Chernogolovka, Russia 15Moscow Institute for Physics and Technology, 141700 Dolgoprudny, Russia 16Samara National Research University, 443086 Samara, Russia 17Department of Physics, KAIST, Daejeon 34141, Republic of Korea 18Research Institute for Nuclear Problems, Belarusian State University, 220030 Minsk, Belarus 19Bogoliubov Laboratory of Theoretical Physics, Joint Institute for Nuclear Research, 141980 Dubna, Russia 20Indiana University Center for Spacetime Symmetries, Bloomington, Indiana 47405, USA 21INFN, 70125 Bari, Italy 22Cornell University, Ithaca, New York 14850, USA 23Department of Physics, KTH Royal Institute of Technology, SE-10691 Stockholm, Sweden 24Dubna State University, 141980 Dubna, Russia 25Helmholtz-Institut für Strahlen- und Kernphysik, Universität Bonn, 53115 Bonn, Germany 26Petersburg Nuclear Physics Institute, 188300 Gatchina, Russia 27Zentralinstitut für Engineering, Elektronik und Analytik (ZEA-2), Forschungszentrum Jülich, 52425 Jülich, Germany (Received 13 January 2018; published 16 April 2018) 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

Solenoid On