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Phase measurement for driven spin oscillations in a storage ring
Rhein Westfal TH Aachen, Phys Inst B 3, D-52056 Aachen, Germany.;Forschungszentrum Julich, Inst Kernphys, D-52425 Julich, Germany..
Forschungszentrum Julich, Inst Kernphys, D-52425 Julich, Germany..
Rhein Westfal TH Aachen, Phys Inst B 3, D-52056 Aachen, Germany.;Forschungszentrum Julich, Inst Kernphys, D-52425 Julich, Germany.;Forschungszentrum Julich, JARA FAME Forces & Matter Expt, D-52056 Aachen, Germany.;Rhein Westfal TH Aachen, D-52056 Aachen, Germany..
Forschungszentrum Julich, Zent Inst Engn Elekt & Analyt ZEA 1, D-52425 Julich, Germany..
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2018 (English)In: Physical Review Accelerators and Beams, ISSN 2469-9888, Vol. 21, no 4, article id 042002Article in journal (Refereed) Published
Abstract [en]

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 Julich 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.

Place, publisher, year, edition, pages
American Physical Society, 2018. Vol. 21, no 4, article id 042002
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-226753DOI: 10.1103/PhysRevAccelBeams.21.042002ISI: 000430077600001Scopus ID: 2-s2.0-85047423976OAI: oai:DiVA.org:kth-226753DiVA, id: diva2:1203665
Funder
EU, FP7, Seventh Framework Programme, 283286
Note

QC 20180504

Available from: 2018-05-04 Created: 2018-05-04 Last updated: 2018-10-16Bibliographically approved

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