%0 Conference Paper
%A Barber, D. P.
%A Hoffstaetter, G. H.
%A Vogt, M.
%T Polarized Protons in HERA
%N DESY-M-02-01F
%M PUBDB-2016-04001
%M DESY-M-02-01F
%P 302-204
%D 2002
%X Since 1994 the e± − p collider HERA has been providing longitudinally polarised electron (positron) beams at 27.5 GeV to the HERMES experiment. The beams become self–polarised by the Sokolov-Ternov effect and the polarisation is made longitudinal with spin–rotators. There is now strong interest in the study of collisions of e± with high energy polarised protons but there is no convincing self-polarising mechanism for protons at highenergy. Therefore protons must be polarised almost at rest in a source and then accelerated to the working energy. At HERA, if no special measures are adopted, this means that the spins must cross several thousand spinorbit resonances, each of which could depolarise the beam.While Siberian Snakes enable all first order resonances to be avoided, higher order resonances can still be destructive. We have searched for orbital tunes that reduce the number of dangerous higher-order resonances and we have searched for a suitable choice of Siberian Snakes.Long term spin-orbit tracking simulations demonstrate that a beam would lose at least about 15
%B The 8th European Particle Accelerator Conference
%C 3 Jun 2002 - 7 Jun 2002, Paris (France)
Y2 3 Jun 2002 - 7 Jun 2002
M2 Paris, France
%K talk: Paris 2002/06/03 (INSPIRE)
%K electron p: storage ring (INSPIRE)
%K p: polarized beam (INSPIRE)
%K polarization: resonance (INSPIRE)
%K spin: rotator (INSPIRE)
%K DESY HERA Stor (INSPIRE)
%F PUB:(DE-HGF)29 ; PUB:(DE-HGF)8
%9 ReportContribution to a conference proceedings
%R 10.3204/PUBDB-2016-04001
%U https://bib-pubdb1.desy.de/record/309821