摘要:

An rf frequency rotator magnet provides a useful tool for manipulating particle spins in any accelerator or storage ring with polarized beams. This note briefly demonstrates the general idea of the rotator‐aided crossing of spin resonance and sketches the proof of a general theorem about the process. The important question of whether this technique can be useful for a specific spin resonance at a particular accelerator involves a detailed analysis of the impact of the rotator on a range of machine parameters. © 2003 American Institute of Physics

ISSN:0094-243X    

DOI:10.1063/1.1586681

出版商:AIP    

年代:1903

数据来源: AIP

摘要:

With a partial Siberian snake in the AGS and transport lines with interspersed horizontal and vertical bends, the incoming spin direction at the injection points of both the collider rings is not likely to match the ideal vertical stable spin direction of RHIC which has two full helical Siberian snakes per ring. In this paper we examine the matching of a polarized beam transfered from the AGS into RHIC. The present 5&percent; partial solenoidal snake as well as a proposed 20&percent; superconducting helical are considered for the AGS. Solutions with retuned snakes in RHIC to better match the incoming beam have been found. © 2003 American Institute of Physics

ISSN:0094-243X    

DOI:10.1063/1.1586682

出版商:AIP    

年代:1903

数据来源: AIP

摘要:

It is shown how one can choose suitable combinations of Siberian Snakes and betatron phase advances to optimize the ability of a ring to accelerate a polarized beam with little reduction of polarization. In an analysis of HERA‐p, these methods have lead to a 14‐fold increase of the vertical beam emittance for which polarization could be preserved. This is not only impressive as a result, but also the methods which lead to this result are very interesting. They contain detailed spin‐orbit tracking and the application of the Froissart‐Stora Formula for higher order spin‐orbit resonances, for which an algorithm of determining resonance strength has been found. © 2003 American Institute of Physics

ISSN:0094-243X    

DOI:10.1063/1.1586683

出版商:AIP    

年代:1903

数据来源: AIP

ISSN:0094-243X    

DOI:10.1063/1.1586811

出版商:AIP    

年代:1903

数据来源: AIP