EIC Tracking Meeting, March 26, 2012

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Presentation transcript:

EIC Tracking Meeting, March 26, 2012 Update on GEM Tracking R&D at Florida Tech & Plans and Requests for 2012 EIC proposal Marcus Hohlmann EIC Tracking Meeting, March 26, 2012

EIC Tracking Meeting - M. Hohlmann R&D Update 3/26/2012 EIC Tracking Meeting - M. Hohlmann

First Test of Zigzag Readout 2 sets of 10cm zigzag strips with different zigzag pitch (along strip) 24 fine zigzag strips 24 coarse zigzag strips CAD Design by C. Pancake, Stony Brook LEMO footpads APV25 Hybrid (using 38% of ch.) + SRS Readout Board for std. CERN 10cm×10cm Triple-GEM Detector 2 mm 2 mm First commissioning step: Measure pedestals and compare with regular straight strips Does the noise increase substantially due to the increased strip area and capacitance? BNL/FIT/SBU Collaboration Work done by grad. students Mike Staib & Vallary Bhopatkar 3/26/2012 EIC Tracking Meeting - M. Hohlmann

Pedestal Distributions 12-bit SRS ADCs (4096 count range) Std. Triple-GEM with 10cm long straight strips Open Readout Board with 10cm long zigzag strips # ev. per ch. # ev. per ch. APV ch. 31 ADC channel ADC channel pedestal width: rms 3.1 → 3.7 cts. # ev. per ch. # ev. per ch. APV ch. 63 ADC channel ADC channel 3/26/2012 EIC Tracking Meeting - M. Hohlmann

Pedestals for 128 channels Open Readout Board with 10cm long zigzag strips Pedestal width (rms) [ADC counts] Channels connected to LEMO footpads (5) 48 channels connected to zigzag strips (24+24) channels not connected APV channel number 3/26/2012 EIC Tracking Meeting - M. Hohlmann

Pedestal Distributions Readout Board with 10cm long zigzag strips covered with one GEM foil placed 2 mm above induction plane: # ev. per ch. APV ch. 31 ADC channel pedestal width: rms 3.7 → 3.9 cts. # ev. per ch. APV ch. 63 ADC channel 3/26/2012 EIC Tracking Meeting - M. Hohlmann

Pedestals for 128 channels Readout Board with 10cm long zigzag strips covered with one GEM foil placed 2 mm above induction plane: Pedestal width (rms) [ADC counts] 48 channels connected to zigzag strips (24+24) Channels connected to LEMO footpads (5) channels not connected APV channel number 3/26/2012 EIC Tracking Meeting - M. Hohlmann

R&D Conclusion & Outlook Noise increases only by 1.5 ADC counts on zz compared w/ straight strips (~ 0.1% of range) Encouraging! Even longer strips might have low enough noise for good measurements. Will also build a prototype with 30cm long zz strips. Next: Put Triple-GEM stack on zigzag r/o board Sandwich between 2 straight-strip GEM detectors See how well we can measure spatial resolution of the zigzag-strip detector using tracked cosmics Produce & test boards with gold-plated zigzag strips 3/26/2012 EIC Tracking Meeting - M. Hohlmann

EIC Tracking Meeting - M. Hohlmann 2012 EIC Proposal INPUT 3/26/2012 EIC Tracking Meeting - M. Hohlmann

Input for Proposal Form a “forward tracking” working group: BNL (?), FIT, U Va., & hopefully others !? Propose to propose for forward tracker R&D : Design & construction of 1-3 full-size, large-area, low-mass, trapezoidal prototype GEM chambers: 2 w/ zigzag strips and 1 w/ straight strips (as ref.) SRS: investigate other chips w/ trigger (Beetle?) Prototype tests: Bench tests at home institutions (cosmics, x-ray, source) Beam tests (in magnet!?, e.g. at CERN via RD51?) Goal: Full slice test with e.g. 3 tracking stations in beam 9/4/2011

Very rough budget estimate Equipment & material ~$85k 3 full-size prototype detectors ~$30k (CERN est.) GEM frames w/ various spacers (UVa.) ~$ 5k 3 large r/o boards (2 zz &1 straight str.) ~$15k mech. stretcher for large foils (UVa.) ~$10k SRS electronics ~$20k Materials (gas, cables, …) ~$ 5k Personnel ~$150k 12 mos. Postdoc (fully loaded) ~$85k (FIT rate as example) (alternative: grad student) (~$30k) 1 mo. Postdoc (UVa., fully loaded) ~$10k Engineering support (0.5 FTE) ~$50k (??) Undergrad. support (UVa.) ~$ 5k Travel Beam tests (at CERN in magnet?) ~$10k per yr TOTAL (shared among inst.) ~$245k for year 1 (1&2?)