Absorbers for the high luminosity insertions of the LHC

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At design luminosity and inelastic cross section {sigma}{sub pp} = 80mb there are 8 {times} 10{sup 8} inelastic collisions per second at the high luminosity interaction points IP1 and IP5 of the LHC. These interactions give rise to {approximately} 0.9 kW of power in collision products leaving an IP in each direction. The inelastic collision power carried off by neutrals, mostly neutrons and photons, in each direction and intercepted by neutral absorbers (TAN) has been estimated with the MARS13 code to be 210W. Similarly the collision power escaping the beam tube and incident on the front face of the inner ... continued below

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4 p.

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Turner, W.C.; Hoyer, E.H. & Mokhov, N.V. June 1, 1998.

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Description

At design luminosity and inelastic cross section {sigma}{sub pp} = 80mb there are 8 {times} 10{sup 8} inelastic collisions per second at the high luminosity interaction points IP1 and IP5 of the LHC. These interactions give rise to {approximately} 0.9 kW of power in collision products leaving an IP in each direction. The inelastic collision power carried off by neutrals, mostly neutrons and photons, in each direction and intercepted by neutral absorbers (TAN) has been estimated with the MARS13 code to be 210W. Similarly the collision power escaping the beam tube and incident on the front face of the inner triplet quadrupole absorber (TAS) has been estimated to be {approximately} 270W, mostly carried by charged pions and photons. Special purpose absorbers must intercept this power to prevent quenching the inner triplet quadrupoles (Q1 to Q3) and the twin aperture magnets outside the second beam separation dipole D2. Because of the high incident flux of collision products near zero degrees the absorbers are natural places to consider for the location of radiation hard gas ionization detectors which could be used for: (1) measurement of luminosity, (2) measurement of the beam transverse dimensions at the IP and (3) feedback control of the colliding beam centers at the IP`s to maximize luminosity. The following sections describe: (1) the conceptual design of the absorbers, (2) the radiation deposition and activation calculations and (3) the possibilities for instrumentation.

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4 p.

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INIS; OSTI as DE98059377

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  • EPAC 1998: 6. European particle accelerator conference, Stockholm (Sweden), 22-26 Jun 1998

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  • Other: DE98059377
  • Report No.: LBNL--41964
  • Report No.: CBP-Note--256;CONF-980671--
  • Grant Number: AC03-76SF00098
  • Office of Scientific & Technical Information Report Number: 666052
  • Archival Resource Key: ark:/67531/metadc702452

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  • June 1, 1998

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  • Sept. 12, 2015, 6:31 a.m.

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  • Nov. 4, 2015, 2:57 p.m.

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Turner, W.C.; Hoyer, E.H. & Mokhov, N.V. Absorbers for the high luminosity insertions of the LHC, article, June 1, 1998; United States. (digital.library.unt.edu/ark:/67531/metadc702452/: accessed August 18, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.