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

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.

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

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  1. 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 Beam runs at IHEP Protvino accelerator U-70 (protons up to 60 GeV, intensity in range 107:1012 particles/sec): November 2007 mistake with EMEC electrode design April 2008 EMEC OK, but LAr in it was frozen November 2008 problems with data acquisition and electronics November 2009 ? ...

  2. Reducing gap size, shaping time… “dE/dx” + ohmic heating Additional cooling loops in critical places, more powerful HV power supplies 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. Energy fluxes at L=1034: η = 2.5 5.0*105 GeV/cm2/s η = 3.2 2.5*106 GeV/cm2/s η = 4.9 2.0*108 GeV/cm2/s Main factors: ion’s mobility and recombination. Signal starts to degrade significantly above critical charge density.

  3. Radiational damage of materials, activation β-decay of Ar41: = 6560 s After 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_2,3 After 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

  4. ATLAS sub-detectors End-cap calorimeters integration Forward Calorimeters Hadronic EC Calorimeters Feedthroughs and Front-end crates Presampler Electromagnetic EC Calorimeter

  5. ATLAS sub-detectorsEnd-cap forward calorimeters • 3.2 < |η| < 4.9 • 106 Gy/yr, neutron flux 109 cm-2s-1 • R1=45.5 cm, r1=7.2 cm, 45 cm • Cell size (cm2)/ number of rods: 2/4, 3.5/6, 5.6/9 • Number of rods: 12000, 10000, 8000 • λ: 2.6, 3.5, 3.4 • Mass (ton): 2.3, 4.1, 4.0

  6. ATLAS sub-detectors • EM calorimeters based on “accordion” technology

  7. ATLAS sub-detectorsHEC design

  8. Scintillators S4,S5,S6 HEC EMEC Second set of iron absorbers (1.8 ) FCAL First set of iron absorbers (0.7 )

  9. 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

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