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Matis, H.S.

Paper Title Page
MOPEC020 Simulation of the LHC BRAN Luminosity Monitor for High Luminosity Interaction Regions 498
 
  • J. Stiller
    Heidelberg University, Heidelberg
  • H.S. Matis, A. Ratti, W.C. Turner
    LBNL, Berkeley, California
  • R. Miyamoto
    BNL, Upton, Long Island, New York
  • S.M. White
    CERN, Geneva
  
 

The LHC BRAN lu­mi­nos­i­ty de­tec­tor mon­i­tors the high lu­mi­nos­i­ty in­ter­ac­tion re­gions (Atlas and CMS). This cham­ber, which is an Argon gas ion­iza­tion de­tec­tor mea­sures the for­ward neu­tral par­ti­cles from col­li­sions the in­ter­ac­tion re­gion. To pre­dict and im­prove the un­der­stand­ing of the de­tec­tor's per­for­mance, we pro­duced a de­tailed model of the de­tec­tor and its sur­round­ings in FLUKA. In this paper, we pre­sent the model and re­sults of our sim­u­la­tions in­clud­ing the de­tec­tor's es­ti­mat­ed re­sponse to in­ter­ac­tions for beam en­er­gies of 3.5, 5.0, and 7.0 TeV.

  
MOPEC021 First Results from the LHC Luminosity Monitors 501
 
  • A. Ratti, H.S. Matis, W.C. Turner
    LBNL, Berkeley, California
  • E. Bravin, S.M. White
    CERN, Geneva
  • R. Miyamoto
    BNL, Upton, Long Island, New York
  
 

The Lu­mi­nos­i­ty Mon­i­tor for the LHC is ready for op­er­a­tion dur­ing the planned 2009-2010 run. The de­vice de­signed for the high lu­mi­nos­i­ty re­gions is a gas ion­iza­tion cham­ber, that is de­signed with the abil­i­ty to re­solve bunch by bunch lu­mi­nos­i­ty as well as sur­vive ex­treme lev­els of ra­di­a­tion. The de­vices are in­stalled at the zero de­gree col­li­sion angle in the TAN ab­sorbers ±140m from the IP and mon­i­tor show­ers pro­duced by high en­er­gy neu­trons from the IP. They are used in real time as a col­lid­er op­er­a­tions tool for op­ti­miz­ing the lu­mi­nos­i­ty at ATLAS and CMS. A pho­to-mul­ti­pli­er based sys­tem is used at low lu­mi­nosi­ties and also avail­able. We will pre­sent early test re­sults, noise and back­ground stud­ies and cor­re­la­tion be­tween the gas ion­iza­tion and the PMT. Com­par­i­son with on­go­ing mod­el­ing ef­forts will be in­clud­ed.