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Title: An ionization chamber shower detector for the LHC Luminosity Monitor

Abstract

The front IR quadrupole absorbers (TAS) and the IR neutral particle absorbers (TAN) in the high luminosity insertions of the Large Hadron Collider (LHC) each absorb approximately 1.8 TeV of forward collision products on average per pp interaction (~;;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. A novel segmented, multi-gap, pressurized gas ionization chamber is being developed 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 low noise, fast, pulse shaping electronics to be capable of resolving individual bunch crossings at 40 MHz. Data on each bunch are to be separately accumulated over multiple bunch crossings until the desired statistical accuracy is obtained. At design luminosity approximately 2x103 bunch crossings will suffice for a 1percent luminosity measurement. In this paper we report the first experimental results of the ionization chamber and analog electronics. Single 450GeV protons from the SPS at CERN are used to simulate the hadronic/electromagnetic showers producedmore » by the forward collision products from the interaction regions of the LHC.« less

Authors:
; ; ; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
Accelerator& Fusion Research Division
OSTI Identifier:
1004998
Report Number(s):
LBNL-47438
Journal ID: ISSN 0018-9499; IETNAE; TRN: US201105%%160
DOE Contract Number:  
DE-AC02-05CH11231
Resource Type:
Journal Article
Journal Name:
IEEE Transactions on Nuclear Science
Additional Journal Information:
Journal Volume: 49; Journal Issue: 1; Conference: 2000 IEEE Nuclear Science Symposium, Lyon, France, Oct. 15-21, 2000; Related Information: Journal Publication Date: 2/1/2002; Journal ID: ISSN 0018-9499
Country of Publication:
United States
Language:
English
Subject:
99; 43; ACCURACY; CERN; DESIGN; HADRONS; IONIZATION CHAMBERS; LUMINOSITY; MONITORS; NEUTRAL PARTICLES; OPTIMIZATION; PROTONS; QUADRUPOLES; RADIATIONS; SAMPLING; SIGNAL-TO-NOISE RATIO; STORAGE RINGS; luminosity hadron collider ionization chamber

Citation Formats

Speziali, V., Beche, J.F., Burks, M.T., Datte, P.S., Haguenauer, M., manfredi, P.F., Millaud, J.E., Placidi, M., Ratti, L., Re, V., Riot, V.J., Schmickler, H., and Turner, W.C. An ionization chamber shower detector for the LHC Luminosity Monitor. United States: N. p., 2000. Web.
Speziali, V., Beche, J.F., Burks, M.T., Datte, P.S., Haguenauer, M., manfredi, P.F., Millaud, J.E., Placidi, M., Ratti, L., Re, V., Riot, V.J., Schmickler, H., & Turner, W.C. An ionization chamber shower detector for the LHC Luminosity Monitor. United States.
Speziali, V., Beche, J.F., Burks, M.T., Datte, P.S., Haguenauer, M., manfredi, P.F., Millaud, J.E., Placidi, M., Ratti, L., Re, V., Riot, V.J., Schmickler, H., and Turner, W.C. Sun . "An ionization chamber shower detector for the LHC Luminosity Monitor". United States. https://www.osti.gov/servlets/purl/1004998.
@article{osti_1004998,
title = {An ionization chamber shower detector for the LHC Luminosity Monitor},
author = {Speziali, V. and Beche, J.F. and Burks, M.T. and Datte, P.S. and Haguenauer, M. and manfredi, P.F. and Millaud, J.E. and Placidi, M. and Ratti, L. and Re, V. and Riot, V.J. and Schmickler, H. and Turner, W.C.},
abstractNote = {The front IR quadrupole absorbers (TAS) and the IR neutral particle absorbers (TAN) in the high luminosity insertions of the Large Hadron Collider (LHC) each absorb approximately 1.8 TeV of forward collision products on average per pp interaction (~;;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. A novel segmented, multi-gap, pressurized gas ionization chamber is being developed 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 low noise, fast, pulse shaping electronics to be capable of resolving individual bunch crossings at 40 MHz. Data on each bunch are to be separately accumulated over multiple bunch crossings until the desired statistical accuracy is obtained. At design luminosity approximately 2x103 bunch crossings will suffice for a 1percent luminosity measurement. In this paper we report the first experimental results of the ionization chamber and analog electronics. Single 450GeV protons from the SPS at CERN are used to simulate the hadronic/electromagnetic showers produced by the forward collision products from the interaction regions of the LHC.},
doi = {},
journal = {IEEE Transactions on Nuclear Science},
issn = {0018-9499},
number = 1,
volume = 49,
place = {United States},
year = {2000},
month = {10}
}