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New Method for a Continuous Determination of the Spin Tune in Storage Rings and Implications for Precision Experiments
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2015 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 115, no 9, 094801Article in journal (Refereed) Published
Abstract [en]

A new method to determine the spin tune is described and tested. In an ideal planar magnetic ring, the spin tune-defined as the number of spin precessions per turn-is given by nu(s) = gamma G (gamma is the Lorentz factor, G the gyromagnetic anomaly). At 970 MeV/c, the deuteron spins coherently process at a frequency of approximate to 120 kHz in the Cooler Synchrotron COSY. The spin tune is deduced from the up-down asymmetry of deuteron-carbon scattering. In a time interval of 2.6 s, the spin tune was determined with a precision of the order 10(-8), and to 1 x 10(-10) for a continuous 100 s accelerator cycle. This renders the presented method a new precision tool for accelerator physics; controlling the spin motion of particles to high precision is mandatory, in particular, for the measurement of electric dipole moments of charged particles in a storage ring.

Place, publisher, year, edition, pages
2015. Vol. 115, no 9, 094801
Keyword [en]
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Physical Sciences
URN: urn:nbn:se:kth:diva-173430DOI: 10.1103/PhysRevLett.115.094801ISI: 000360065900008PubMedID: 26371657ScopusID: 2-s2.0-84940705211OAI: diva2:856606
EU, FP7, Seventh Framework Programme

QC 20140924

Available from: 2015-09-24 Created: 2015-09-11 Last updated: 2015-09-24Bibliographically approved

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Engblom, Pia Thörngren
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Nuclear Physics
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