Development of a detector for bunch by bunch measurement and optimization of luminosity in the LHC

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The front IR quadrupole absorbers (TAS) and the IR neutral particle absorbers (TAN) in the high luminosity insertions of the LHC each absorb approximately 1.8TeV of forward collision products on average per pp interaction ({approximately}235W at design luminosity 1034cm-2s-1). This secondary particle flux can be exploited to provide a useful storage ring operations tool for optimization of luminosity. Novel segmented, multi-gap, pressurized gas ionization chambers are proposed for sampling the energy deposited near the maxima of the hadronic/ electromagnetic showers in these absorbers. The system design choices have been strongly influenced by optimization of signal to noise ratio and by ... continued below

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Turner, W.C.; Burks, M.T.; Datte, P.S.; Manfredi, P.F.; Millaud, J.E.; Mokhov, N.V. et al. May 19, 2000.

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The front IR quadrupole absorbers (TAS) and the IR neutral particle absorbers (TAN) in the high luminosity insertions of the LHC each absorb approximately 1.8TeV of forward collision products on average per pp interaction ({approximately}235W at design luminosity 1034cm-2s-1). This secondary particle flux can be exploited to provide a useful storage ring operations tool for optimization of luminosity. Novel segmented, multi-gap, pressurized gas ionization chambers are proposed for sampling the energy deposited near the maxima of the hadronic/ electromagnetic showers in these absorbers. The system design choices have been strongly influenced by optimization of signal to noise ratio and by the very high radiation environment. The ionization chambers are instrumented with state of the art low noise, fast, pulse shaping electronics capable of resolving individual bunch crossings at 40 MHz. Data on each bunch are separately accumulated over multiple bunch crossings until the desired statistical accuracy is obtained. At design luminosity approximately 2x103 bunch crossings suffice for a 1% luminosity measurement.

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  • Journal Name: Nuclear Instruments and Methods in Physics Research, Section A; Journal Volume: 461; Journal Issue: 1-3; Other Information: Journal Publication Date: April 1, 2001

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  • Report No.: LBNL--45774
  • Report No.: CBP Note-337
  • Grant Number: AC03-76SF00098
  • Office of Scientific & Technical Information Report Number: 783457
  • Archival Resource Key: ark:/67531/metadc724939

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  • May 19, 2000

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  • Sept. 29, 2015, 5:31 a.m.

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  • Sept. 1, 2016, 7:11 p.m.

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Turner, W.C.; Burks, M.T.; Datte, P.S.; Manfredi, P.F.; Millaud, J.E.; Mokhov, N.V. et al. Development of a detector for bunch by bunch measurement and optimization of luminosity in the LHC, article, May 19, 2000; California. (digital.library.unt.edu/ark:/67531/metadc724939/: accessed August 19, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.