Correction of the Chromaticity up to Second Order for MEIC

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The proposed electron collider lattice exhibits low β- functions at the Interaction Point (IP) (βx∗100mm − βy∗ 20 mm) and rather large equilibrium momentum spread of the collider ring (δp/p = 0.00158). Both features make the chromatic corrections of paramount importance. Here the chromatic effects of the final focus quadruples are cor- rected both locally and globally. Local correction features symmetric sextupole families around the IP, the betatron phase advances from the IP to the sextupoles are chosen to eliminate the second order chromatic aberration. Global interleaved families of sextupoles are placed in the figure-8 arc sections, and non-interleaved families ... continued below

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

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The proposed electron collider lattice exhibits low β- functions at the Interaction Point (IP) (βx∗100mm − βy∗ 20 mm) and rather large equilibrium momentum spread of the collider ring (δp/p = 0.00158). Both features make the chromatic corrections of paramount importance. Here the chromatic effects of the final focus quadruples are cor- rected both locally and globally. Local correction features symmetric sextupole families around the IP, the betatron phase advances from the IP to the sextupoles are chosen to eliminate the second order chromatic aberration. Global interleaved families of sextupoles are placed in the figure-8 arc sections, and non-interleaved families at straight sec- tion making use of the freely propagated dispersion wave from the arcs. This strategy minimizes the required sex- tupole strength and eventually leads to larger dynamic aper- ture of the collider. The resulting spherical aberrations induced by the sextupoles are mitigated by design; the straight and arc sections optics features an inverse identity transformation between sextupoles in each pair.

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

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  • Report No.: JLAB-ACP-11-1348
  • Report No.: DOE/OR/23177-1636
  • Grant Number: AC05-06OR23177
  • Office of Scientific & Technical Information Report Number: 1020995
  • Archival Resource Key: ark:/67531/metadc835556

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  • March 1, 2010

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  • May 19, 2016, 3:16 p.m.

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  • Aug. 3, 2016, 6:21 p.m.

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H. K. Sayed, S.A. Bogacz, P. Chevtsov. Correction of the Chromaticity up to Second Order for MEIC, article, March 1, 2010; Newport News, Virginia. (digital.library.unt.edu/ark:/67531/metadc835556/: accessed July 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.