Spin Rotator Optics for MEIC

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A unique de­sign fea­ture of a po­lar­ized Medi­um En­er­gy Elec­tron-Ion Col­lid­er (MEIC) based on CEBAF is its 'Fig­ure-8' stor­age rings for both elec­trons and ions, which sig­nif­i­cant­ly sim­pli­fies beam po­lar­iza­tion main­te­nance and ma­nip­u­la­tion. While elec­tron (positron) po­lar­iza­tion is main­tained ver­ti­cal in arcs of the ring, a sta­ble lon­gi­tu­di­nal spin at four col­li­sion points is achieved through solenoid based spin ro­ta­tors and hor­i­zon­tal orbit bends. The pro­posed MEIC lat­tice was de­vel­oped in order to pre­serve a very high po­lar­iza­tion (more than 70%) of the elec­tron beams in­ject­ed from the CEBAF ma­chine. The oth­er­wise cou­pled beam tra­jec­to­ry due to solenoids used in ... continued below

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H. K. Sayed, S.A. Bogacz, P. Chevtsov March 1, 2010.

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A unique de­sign fea­ture of a po­lar­ized Medi­um En­er­gy Elec­tron-Ion Col­lid­er (MEIC) based on CEBAF is its 'Fig­ure-8' stor­age rings for both elec­trons and ions, which sig­nif­i­cant­ly sim­pli­fies beam po­lar­iza­tion main­te­nance and ma­nip­u­la­tion. While elec­tron (positron) po­lar­iza­tion is main­tained ver­ti­cal in arcs of the ring, a sta­ble lon­gi­tu­di­nal spin at four col­li­sion points is achieved through solenoid based spin ro­ta­tors and hor­i­zon­tal orbit bends. The pro­posed MEIC lat­tice was de­vel­oped in order to pre­serve a very high po­lar­iza­tion (more than 70%) of the elec­tron beams in­ject­ed from the CEBAF ma­chine. The oth­er­wise cou­pled beam tra­jec­to­ry due to solenoids used in the spin ro­ta­tors was de­cou­pled by de­sign. Aspin match­ing tech­nique needs to be im­ple­ment­ed in order to en­hance quan­tum self-po­lar­iza­tion and min­i­mize de­po­lar­iza­tion ef­fects.

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  • IPAC'10, 23-28 May 2010, Kyoto, Japan

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  • Report No.: JLAB-ACP-11-1347
  • Report No.: DOE/OR/23177-1635
  • Grant Number: AC05-06OR23177
  • Office of Scientific & Technical Information Report Number: 1020994
  • Archival Resource Key: ark:/67531/metadc843231

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  • March 1, 2010

Added to The UNT Digital Library

  • May 19, 2016, 3:16 p.m.

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  • Aug. 3, 2016, 6:01 p.m.

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H. K. Sayed, S.A. Bogacz, P. Chevtsov. Spin Rotator Optics for MEIC, article, March 1, 2010; Newport News, Virginia. (digital.library.unt.edu/ark:/67531/metadc843231/: accessed August 17, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.