Interaction region analysis for a high-field hadron collider

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The primary goal of the interaction region (IR) is to demagnify the transverse beam dimension to a small spot size at the interaction point (IP) to reach the required luminosity. With an experimental drift space of {+-}25 m and a quadrupole focusing strength of 360 T/m at the triplets, a {Beta}* of 0.1 m can be achieved at a beam energy of 50 TeV. Only two families of sextupoles are needed to globally correct the chromaticity. Since the momentum spread of the beam is small ({sigma}{sub p} {approx} 2 x 10{sup -5}), a relatively large (about 20) linear chromaticity can ... continued below

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6 p.

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Wei, Jie; Peggs, S.G. & Goderre, G.P. December 1, 1996.

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The primary goal of the interaction region (IR) is to demagnify the transverse beam dimension to a small spot size at the interaction point (IP) to reach the required luminosity. With an experimental drift space of {+-}25 m and a quadrupole focusing strength of 360 T/m at the triplets, a {Beta}* of 0.1 m can be achieved at a beam energy of 50 TeV. Only two families of sextupoles are needed to globally correct the chromaticity. Since the momentum spread of the beam is small ({sigma}{sub p} {approx} 2 x 10{sup -5}), a relatively large (about 20) linear chromaticity can be tolerated so that higher-order chromatic aberration produced by the low-{Beta}* optics is negligible. With a crossing angle of 70 {mu}r and a beam separation of 5 {sigma}, the required minimum aperture of the triplet magnets is about 3 cm. The luminosity reduction resulted from such a crossing angle is about 13%. Crab crossing can be used to further reduce {Beta}* to below 0.05 m. At the same time, luminosity degradation caused by the angle crossing is eliminated. With crab cavities positioned near the triplet operating at a voltage of a few MV, the required voltage of the 379 MHz storage rf system can be reduced from the nominal 100 MV to below 10 MV. The requirements on the accuracy of the positioning of the crab cavities and the operating voltage are both moderate. More than two families of sextupoles are needed for global chromatic compensation only when, {Beta}* approaches 0.05 m and below.

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6 p.

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INIS; OSTI as DE97001551

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  • 1996 DPF/DPB workshop on new directions for high energy physics, Snowmass, CO (United States), 25 Jun - 12 Jul 1996

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  • Other: DE97001551
  • Report No.: BNL--63535
  • Report No.: CONF-9606243--17
  • Grant Number: AC02-76CH00016
  • Office of Scientific & Technical Information Report Number: 414609
  • Archival Resource Key: ark:/67531/metadc677599

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  • December 1, 1996

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  • July 25, 2015, 2:20 a.m.

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  • Nov. 9, 2015, 9:51 p.m.

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Wei, Jie; Peggs, S.G. & Goderre, G.P. Interaction region analysis for a high-field hadron collider, article, December 1, 1996; Upton, New York. (digital.library.unt.edu/ark:/67531/metadc677599/: accessed September 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.