1 / 12

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. Reducing gap size, shaping time….

stephen-hunter
Télécharger la présentation

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

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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

  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. 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

More Related