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GEM DHCAL Plans

GEM DHCAL Plans. Jae Yu CALICE TB Review June 16 and 17 @ FNAL. Why GEM’s for DHCAL?. Flexible configurations: allows small anode pads for high granularity Robust: survives ~10 12 particles/mm 2 with no performance degradations Fast: based on electron collection, ~few ns rise time

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GEM DHCAL Plans

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  1. GEM DHCAL Plans Jae Yu CALICE TB Review June 16 and 17 @ FNAL

  2. Why GEM’s for DHCAL? • Flexible configurations: allows small anode pads for high granularity • Robust: survives ~1012 particles/mm2 with no performance degradations • Fast: based on electron collection, ~few ns rise time • Short recovery time  can handle high rates • Uses simple gas (Ar/CO2) – no long-term issues • Runs at relatively low HV ( ~400V across a foil) • Stable and robust operations GEM DHCAL Plans, J. Yu

  3. What have been done so far? • Bench tested with various source and cosmic ray • Used QPA02 chip based preamp • Verified the signal shape, responses and gain • Took a beam test at a high flux electron beam • First chamber built with 3M’s 30cmx30cm GEM • Used QPA02 chip based preamp • Verified that the chamber can survive • Took two beam tests at FNAL’s MTBF • Used QPA02 chip based preamp • 8 GeV pion beams and 120GeV proton beams • Measured chamber responses, efficiencies and gain • Multiple channel readout w/ Analog KPiX chips GEM DHCAL Plans, J. Yu

  4. GEM DHCAL Status Have been working on getting the SLAC-Oregon KPiX analog chip working with GEM KPiX modified to accommodate smaller GEM signals (>~20fC) Signal from source extracted using 64 channel KPiX v4 No external trigger acceptance Basically a random trigger with respect to signal arrival A chamber with the updated KPiX v7 with external trigger capability working Have been debugging the chip Cosmic and source data taken and being understood 7% duty factor a cosmic killer GEM DHCAL Plans, J. Yu

  5. KPiX Self Trigger Threshold and Noise Scan 1.8V • Threshold at 2.0V most optimal • Observe clear Landau distribution of β from Ru106 1.9V 2.0V 2.1V 2.2V 2.3V Ru106 Source Noise GEM DHCAL Plans, J. Yu

  6. -2100V ∆V ~400V ∆V ~400V 0V HV dependence of Fe55 spectrum No obvious two characteristic X-ray peaks (4 and 5.9KeV) 3mm 2mm 2mm GEM DHCAL Plans, J. Yu

  7. Cosmic Ray Data with External Trigger HV@ 0V More data is being collected GEM DHCAL Plans, J. Yu

  8. GEM DHCAL Plans - I Through Fall 2009 30cmx30cm chamber Construct a new chamber with optimal gas flow design Complete characterization of the chamber with sources and cosmic rays using 64 channel KPiX v7 Characterize the chamber in particle beams Responses, noise characteristics, efficiencies, gains, etc 33cmx100cm unit chamber Finalize 33cmx100cm (32cmx96cm active area) large GEM foil silkscreen design and submit to CERN GDD GEM DHCAL Plans, J. Yu

  9. Gas Transparent Spacers Pathway for gas Room for HV lead wire Space for HV soldering GEM foil • Grid thickness: 1 mm • Gas hole between adjacent cell: • 5x1 mm2 for 3 mm spacer • 5x0.5 mm2 for 1 mm spacer

  10. Fe55 Source Signal Gas outlet Top side Data cable HV power LV power Analog signal GEM DHCAL Plans, J. Yu

  11. Large GEM Foil Draft Design Active area = 990x329.9 mm2 We need copper region and some markings for GEM alignment. We can reduce the number of sectors. It’s 33 currently.

  12. Large GEM Foil Development with CERN-GDD • The size of the foils are 33cmx100cm, the same as the physical size of the unit chamber • Active area is 32cmx96cm • Is this realistic to think of constructing a chamber with the same physical size foils? • CERN GDD says that the foils will be delivered in eight weeks or so once the design is completed • One-side hole etching technique is being improved  Since gain shows factor two difference GEM DHCAL Plans, J. Yu

  13. GEM DHCAL Plans - II Fall 2009 – Late 2009 33cmx100cm thin GEM unit chambers Production and certification of 33cmx100cm foils Characterization of 256 channel v8 KPiX chips To be available in fall 2009 Use 30cmx30cm STP chamber Begin construction and characterization of 33cmx100cm unit chambers One with 256 channel V8 KPiX boards Remainder with DCAL Chip Large Thick GEMs Working with Weizman institute on TGEMs Certification of large TGEMs GEM DHCAL Plans, J. Yu

  14. UTA’s 33cmx100cm DHCAL Unit Chamber Readout Board 330x500 mm2 1000 mm Basesteel plate, t=2 mm 330 mm GEM DHCAL Plans, J. Yu

  15. GEM DHCAL Plans - III Early 2010 – Late 2011 33cmx100cm thin GEM unit chambers w/ DCAL chips Characterization with DCAL chip Complete production of fifteen 33cmx100cm unit chambers Construct five 100cmx100cm GEM DHCAL planes Using DCAL III readout chips Beam test GEM DHCAL planes in the CALICE beam test stack together with RPC TGEMs and RETGEMs Construction and characterization of a prototype chamber using an analog readout chip Beam test of TGEM prototype chamber GEM DHCAL Plans, J. Yu

  16. UTA’s 100cmx100cm Digital Hadron Calorimeter Plane GEM DHCAL Plans, J. Yu

  17. GEM DHCAL Beam Test Plans • Phase I  Completion of 30cmx30cm characterization • Fall 2009 at MTBF: using one plane of 30cmx30cm double GEM chamber with 64 channel KPiX7 • Phase II  33cmx100cm unit chamber characterization • Late 2009 – late 2010 at MTBF: Using 256 channel v8 KPiX chips and with DCAL chip • Possible beam test and characterization of TGEM prototype using 256 channel v8 KPiX chips • Phase III  100cmx100cm plane GEM DHCAL performances in the CALICE stack • Late 2010 – late 2011 at MTBF • Five 100cmx100cm planes inserted into existing CALICE calorimeter stack and run with either Si/W or Sci/W ECALs and RPC planes in the remaining HCAL layers GEM DHCAL Plans, J. Yu

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