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Phase locking the spin precession in a storage ring

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arxiv 1703.07561 v2 pith:SE2CHVEN submitted 2017-03-22 physics.acc-ph

N. Hempelmann , V. Hejny , J. Pretz , E. Stephenson , W. Augustyniak , Z. Bagdasarian , M. Bai , L. Barion
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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
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classification physics.acc-ph
keywords polarizationfrequencyhorizontalphaseprecessionratestoragefeedback
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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 ($\approx 121$ 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 one 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.

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