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presented by J. Huston Michigan State University

Forward scintillators in ATLAS: cryostat and MBTS CERN Dubna Michigan State University University of Texas-Arlington. presented by J. Huston Michigan State University (apologies: some useful drawings captive on laptop, in for repairs). ITC Scintillators. (cryostat (or crack) scintillators).

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presented by J. Huston Michigan State University

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  1. Forward scintillators in ATLAS: cryostat and MBTSCERNDubnaMichigan State UniversityUniversity of Texas-Arlington presented by J. Huston Michigan State University (apologies: some useful drawings captive on laptop, in for repairs)

  2. ITC Scintillators (cryostat (or crack) scintillators) (gap scintillators) 1.6 1.4 E3 C10 B11 E1 D5 A14 - A15 B14 D6 A16 - - 1.2 D4 A12 A13 B12 - B13 - - - - B15 - 1.1 1.0

  3. Crack Scintillator (E3, E4)

  4. Mounting Proposal

  5. View of 2 cryostat shells mounting bracket

  6. Closeup

  7. Bracket in final position

  8. Bracket in final position

  9. Special ITC brackets

  10. Inner radius • Counters held together by pins in one module fitting into slots in neighbor module

  11. Cryostat scintillator status as of 2004 • Optics, PMT’s, electronics and even mechanical shells were available • Scintillator purchase was a victim of management contingency and the cryostat scintillators were on the upgrade path • In the last few months, thanks to Marzio and Howard Gordon, the money is now available for construction and installation • Scintillator has been shipped from CERN to MSU yesterday • ~2.5 month delay • Construction will still be complete during summer Same WLS fibers as for gap scintillators …and,to save money, we will use polystyrene scintillator provided by Dubna, rather than the PVT scintillator from Bicron; factor of 2 less light yield, i.e. more like 2-3 pe/mip calibration issues

  12. MBTS counters 2 segments in h; inner segment covers pixel detectors

  13. Readout • Scintillator is polystyrene-based, 2 cm thick • Readout is by WLS fibers running along division between L/R scintillator segments plus through sigma grooves in scintillator • Struggle to be able to trigger on MIP’s • increase light yield using every trick we know • Will also crank up HV to 900 V • WLS fibers welded to clear fibers to produce a pigtail which will mate into 1/8 of cryostat scintillator optical connections • after commissioning cryostat detectors will be re-connected

  14. Scintillator • Scintillator has been produced by Dubna • same scintillator as used for CDF central pre-radiator upgrade • currently at CERN, awaiting shipment to MSU later this week • ~2.5 month delay… • …construction will still be complete in September • will continue to test counters using ATLAS electronics readout chain at the U. of Chicago • …and installation will take place this fall/winter

  15. New decision • MBTS scintillator and boronated polyethylene moderator will be mounted together in same can • MBTS counters are never removed; they just slowly die but continue to moderate • Moderator has to be machined back to 30 mm • currently looking for vendor • envelope of MBTS + moderator is 57 mm

  16. New drawings of moderator + MBTS …still have to be approved 3606 3547

  17. MBTS drawings

  18. Installation work • This fall/winter, the gap and cryostat scintillators will be installed on EBA and EBC • maybe delay in current schedule, but roughly Nov and Jan • During these times, teams from the institutions listed on front page will be at CERN and will also work on installation of MBTS counters + moderator • working with shielding group • all details not worked out yet, but Ron Richards is at CERN for next few weeks to coordinate • installation is designed to be relatively straightforward

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