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Update on HBD Activities at BNL

Update on HBD Activities at BNL. Craig Woody BNL. HBD Working Group Meeting November 16, 2004. Overview of Activities. Preamps Readout board Small prototype Gas system M onitoring CsI evaporator Clean room for assembly. Preamps (IO 1195). (Joe Harder, Instrumentation Division).

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Update on HBD Activities at BNL

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  1. Update on HBD Activities at BNL Craig Woody BNL HBD Working Group Meeting November 16, 2004

  2. Overview of Activities • Preamps • Readout board • Small prototype • Gas system • Monitoring • CsI evaporator • Clean room for assembly C.Woody, HBD Working Group Meeting, 11/16/04

  3. Preamps (IO 1195) (Joe Harder, Instrumentation Division) • Prototypes tested and working on the bench • Noise ~ 350 e’s with Cin ~ 5 pf and 250 ns shaping • Parts ordered for up to 2000 pieces C.Woody, HBD Working Group Meeting, 11/16/04

  4. Test with GEM Detector PA Pulse Trace on Scope Pulser Input(1.2pF)~ 13mV100,000 e-’s • Input capacitance ~ 0.0 pF?? • 20 pe x 5E3 (gain) ~ • 100,000 electron input into • pre-amp • Baseline Noise~ 1100e-’s • after background is subtracted • off. s(Baseline Noise) ~1100 e-’s PA Output~48mV  PA Pulse Height Spectrum B.Azmoun C.Woody, HBD Working Group Meeting, 11/16/04

  5. Readout board (Bo Yu, Instrumentation Division) • Currently designing board for small prototype • Designed to use 10x10 cm2 GEMs • 16 pads, 2.5 x 2.5 cm2 each • Honeycomb structure • Will test construction, assembly, • feed throughs, etc. • Will use standard output connector, • but will be able to mate to final • high density connector • Will use this design to scale up to final size boards C.Woody, HBD Working Group Meeting, 11/16/04

  6. 50 cm Prototype • Small prototype to test actual HBD components • Constructed out of light weight material (no stainless) • 50 cm radiator • Uses 10x10 cm GEMs • Will test with gas system in lab to study gas purity and test CF4 operation in a “realistic” detector • Could be used to test in PHENIX and/or Light Source GEM C.Woody, HBD Working Group Meeting, 11/16/04

  7. Gas System (Leonid Kotchenda, Rob Pisani, Carter Biggs) CF4 output gas collected, compressed, purified and reused C.Woody, HBD Working Group Meeting, 11/16/04

  8. Beam Splitter MgF2 Windows Gas Cells Input gas Output gas HBD East Output gas HBD West Reference Silicylate Windows PMTs Focusing elemements D2 Lamp Monochromator Monitoring • Gas purity monitoring • Need spectrometer to measure UV transmission • of input and output gas • Gas gain monitoring • Using MIPs w/reverse bias ? • CsI QE monitoring • YAG laser ? • 4th harmonic @ 266 nm • Test planned • Hg lamp ? C.Woody, HBD Working Group Meeting, 11/16/04

  9. CsI Evaporation Looked at evaporators at BNL Instrumentation & Stony Brook • Both seem to be able to do the job • Can do up to 17” (43 cm) diameter • Stony Brook facility seems more accessible (and cleaner) • Will begin doing evaporation tests starting this week with • small (1”x1”) GEMs • Check thickness of deposited layer • Check uniformity of large area deposits • Check quality of CsI C.Woody, HBD Working Group Meeting, 11/16/04

  10. Clean Room Facility at BNL • Large, new clean room in Instrumentation Division • Available on a shared basis starting next year • Would need glove box/dry box for assembly & storage C.Woody, HBD Working Group Meeting, 11/16/04

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