Synchrotron oscillation effects on an rf-solenoid spin resonance

Benati, P.; Öllers, D.; Polyanskiy, A.; Guidoboni, G.; Mchedlishvili, D.; Lorentz, B.; Dietrich, J.; Weidemann, Ch.; Maier, R.; Stockhorst, H.; Ströher, H.; Lenisa, P.; Hejny, V.; Kulessa, P.; Wüstner, P.; Stephenson, E. J.; Gebel, R.; Lehrach, A.; Pesce, A.; Chiladze, D.; Morse, W. M.; Semertzidis, Y. K.; Kamerdzhiev, Vsevolod; Rathmann, F.; Gaisser, M.; Talman, R.; Valdau, Yu.; Kacharava, A.; Prasuhn, D.

doi:10.1103/PhysRevSTAB.15.124202

Journal Article

FZJ-2013-01293

Synchrotron oscillation effects on an rf-solenoid spin resonance

Benati, P. (Corresponding author) ; Chiladze, D. ; Dietrich, J. ; Gaisser, M.FZJ* ; Gebel, R. ; Guidoboni, G.FZJ* ; Hejny, V.FZJ* ; Kacharava, A. ; Kamerdzhiev, V.FZJ* ; Kulessa, P. ; Lehrach, A.FZJ* ; Lenisa, P. ; Lorentz, B. ; Maier, R.FZJ* ; Mchedlishvili, D.FZJ* ; Morse, W. M. ; Öllers, D. ; Pesce, A. ; Polyanskiy, A. ; Prasuhn, D. ; Rathmann, F. ; Semertzidis, Y. K. ; Stephenson, E. J. ; Stockhorst, H. ; Ströher, H.FZJ* ; Talman, R. ; Valdau, Y. ; Weidemann, C.FZJ* ; Wüstner, P.ZEA-2*FZJ*

2012
Soc. [S.l.] @

Physical review accelerators and beams 15(12), 124202 (2012) [10.1103/PhysRevSTAB.15.124202]

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Please use a persistent id in citations: http://hdl.handle.net/2128/5019 doi:10.1103/PhysRevSTAB.15.124202

Abstract: New measurements are reported for the time dependence of the vertical polarization of a 0.97 GeV/c deuteron beam circulating in a storage ring and perturbed by an rf solenoid. The storage ring is the cooler synchrotron (COSY) located at the Forschungszentrum Juelich. The beam polarization was measured continuously using a 1.5 cm thick carbon target located at the edge of the circulating deuteron beam and the scintillators of the EDDA detector. An rf solenoid mounted on the ring was used to generate fields at and near the frequency of the 1 - G spin resonance. Measurements were made of the vertical beam polarization as a function of time with the operation of the rf solenoid in either fixed or continuously variable frequency mode. Using rf-solenoid strengths as large as 2.66*10^5 revolutions/turn, slow oscillations ( 1 Hz) were observed in the vertical beam polarization. When the circulating beam was continuously electron cooled, these oscillations completely reversed the polarization and showed no sign of diminishing in amplitude. But for the uncooled beam, the oscillation amplitude was damped to nearly zero within a few seconds. A simple spin-tracking model without the details of the COSY ring lattice was successful in reproducing these oscillations and demonstrating the sensitivity of the damping to the magnitude of the synchrotron motion of the beam particles. The model demonstrates that the characteristic features of measurements made in the presence of large synchrotron oscillations are distinct from the features of such measurements when made off resonance. These data were collected in preparation for a study of the spin coherence time, a beam property that needs to become long to enable a search for an electric dipole moment using a storage ring.

Keyword(s): deuteron: beam ; beam: polarization ; spin: resonance ; carbon: target ; solenoid ; synchrotron oscillation: effect ; scintillation counter ; Juelich COSY PS ; beam dynamics ; EDDA ; electric moment: measurement methods ; beam profile ; polarization: time dependence