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26 April 2024

» arxiv » 0901.2564

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Spin resonance strengths due to rf solenoids and dipoles for stored deuteron beams
M.A. Leonova ; A.W. Chao ; E.D. Courant ; A.D. Krisch ; V.S. Morozov ; R.S. Raymond ; D.W. Sivers ; J.M. Williams ; V.K. Wong ; A. Garishvili ; R. Gebel ; A. Lehrach ; B. Lorentz ; R. Maier ; D. Prasuhn ; H. Stockhorst ; D. Welsch ; F. Hinterberger ; K. Ulbrich ; Ya.S. Derbenev ; A.M. Kondratenko ; Y.F. Orlov ; E.J. Stephenson ; N.P.M. Brantjes ; C.J.G. Onderwater ; M. da Silva ;
Date:	16 Jan 2009
Abstract:	Recent experiments reported huge disagreements between the spin resonance strengths measured in rf frequency sweeps and the theoretical values calculated from the rf dipoles’ integral-Bdl using the widely-used formulae. The measured:calculated strength ratios found in these experiments, ranging from 0.15 to 170, resulted in careful re-examinations of these formulae. This paper reports frequency sweeps of a new rf-solenoid magnet, with 1.85 GeV/c polarized deuterons stored in COSY; the measured ratio was 1.02 +/- 0.05. These new data firmly support one of the earlier-disputed factors of 2 in the rf-solenoid formula; they also validate the experimental calibration of earlier rf-dipole data at COSY, which found a strength ratio of 0.15 +/- 0.01 for deuterons. Together the experiments indicate that the widely-used formula for rf dipoles is not correct.
Source:	arXiv, 0901.2564
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