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Locking the Spin Precession in a Storage Ring
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2017 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 119, no 1, article id 014801Article in journal (Refereed) Published
Abstract [en]

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 (approximate to 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 sigma= 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.

Place, publisher, year, edition, pages
American Physical Society, 2017. Vol. 119, no 1, article id 014801
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-211346DOI: 10.1103/PhysRevLett.119.014801ISI: 000404764500007Scopus ID: 2-s2.0-85022343225OAI: oai:DiVA.org:kth-211346DiVA, id: diva2:1129084
Funder
EU, European Research Council, 694390EU, FP7, Seventh Framework Programme, 283286
Note

QC 20170801

Available from: 2017-08-01 Created: 2017-08-01 Last updated: 2017-08-01Bibliographically approved

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Thörngren Engblom, Pia
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