INTAS Progress Report 2007 : INTAS-CERN 05-103-7555

download INTAS  Progress  Report 2007 : INTAS-CERN 05-103-7555

of 12

  • date post

    02-Jan-2016
  • Category

    Documents

  • view

    28
  • download

    4

Embed Size (px)

description

INTAS Progress Report 2007 : INTAS-CERN 05-103-7555 Title : A proposal for R&D to establish the limitations on the operation of the ATLAS end-cap calorimeters at high LHC luminosity Coordinators : Peter Schacht, Sergei Denisov Start date : 8. 5. 2006. Reducing gap size, shaping time…. - PowerPoint PPT Presentation

Transcript of INTAS Progress Report 2007 : INTAS-CERN 05-103-7555

  • INTAS Progress Report 2007: INTAS-CERN 05-103-7555Title: A proposal for R&D to establish the limitations on the operation of the ATLAS end-cap calorimeters at high LHC luminosityCoordinators: Peter Schacht, Sergei DenisovStart date: 8. 5. 2006

  • Energy fluxes at L=1034: = 2.5 5.0*105 GeV/cm2/s = 3.2 2.5*106 GeV/cm2/s = 4.9 2.0*108 GeV/cm2/sMain factors: ions mobility and recombination.Signal starts to degrade significantly above critical charge density.In HEC and EMEC, should not exceed 5 %.In FCAL ~ 64 V at nominal of 250 V. The resistors sit on the rear HEC side.Reducing gap size, shaping timedE/dx + ohmic heatingAdditional cooling loops in critical places, more powerful HV power supplies

  • Radiational damage of materials, activation

    -decay of Ar41: = 6560 sAfter 100 days running at L=10**34: 98 GBq in EMEC, 50 in Barrel, 11 in HEC, 1.1 in FCAl_1, 0.5 in FCAl_2,3After 7 more days of cool-down:9.7 GBq in EMEC, 2.1 in Barrel, 6.5 in HEC, 19 in FCAl_1, 600 (?) in FCAl_2,3

  • LHC schedule (L.Evans & Dec 2006 Council): last magnet installed March 07 machine closed August 07 450 GeV (lum~1029:1030, 75 ns between bunch crossings) November 07 7 TeV August 08

    Calorimeters (plan of 20 February): end of access to ECA - end of June, Barrel A 15 July, Barrel C and ECC 15 August

    Problems: calorimeters - LV power supplies (BNL and CERN, modified version should be supplied starting from April) Inner detector - SCT and TRT - heaters problem, Pixels on retard

    LHC - failure of support structure of final focus inner triplet superconductive quadrupoles (1 of 28, all assembled by FNAL) during pressure test 27 March