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presented by J. Huston Michigan State University

Minimum Bias Trigger Scintillators (MBTS) a project of: 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). MBTS counters.

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presented by J. Huston Michigan State University

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  1. Minimum Bias Trigger Scintillators (MBTS)a project of:CERNDubnaMichigan State UniversityUniversity of Texas-Arlington presented by J. Huston Michigan State University (apologies: some useful drawings captive on laptop, in for repairs)

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

  3. 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

  4. 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

  5. Preliminary mounting scheme …making use of mounting holes in cryostats

  6. 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

  7. New drawings of moderator + MBTS …still have to be approved

  8. MBTS drawings

  9. 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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