Dynamics of polarization buildup by spin filtering - High Energy Physics - PhenomenologyReport as inadecuate




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Abstract: There has been much recent research into polarizing an antiproton beam,instigated by the recent proposal from the PAX Polarized AntiprotoneXperiment project at GSI Darmstadt. It plans to polarize an antiproton beamby repeated interaction with a polarized internal target in a storage ring. Themethod of polarization by spin filtering requires many of the beam particles toremain within the ring after scattering off the polarized internal target viaelectromagnetic and hadronic interactions. We present and solve sets ofdifferential equations which describe the buildup of polarization by spinfiltering in many different scenarios of interest to projects planning toproduce high intensity polarized beams. These scenarios are: 1 spin filteringof a fully stored beam, 2 spin filtering while the beam is being accumulated,i.e. unpolarized particles are continuously being fed into the beam, 3 theparticle input rate is equal to the rate at which particles are being lost dueto scattering beyond ring acceptance angle, the beam intensity remainingconstant, 4 increasing the initial polarization of a stored beam by spinfiltering, 5 the input of particles into the beam is stopped after a certainamount of time, but spin filtering continues. The rate of depolarization of astored polarized beam on passing through an electron cooler is also shown to benegligible.



Author: N. H. Buttimore, D. S. O'Brien

Source: https://arxiv.org/







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