EIC Tracking Meeting, March 26, 2012

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

2. R&D Update EIC Tracking Meeting - M. Hohlmann

3. First Test of Zigzag Readout 2 sets of 10cm zigzag strips with different zigzag pitch (along strip) 24 coarse zigzag strips 24 fine 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 EIC Tracking Meeting - M. Hohlmann

4. Pedestal Distributions 12-bit SRS ADCs (4096 count range) Open Readout Board with 10cm long zigzag strips Std. Triple-GEM with 10cm long straight 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 EIC Tracking Meeting - M. Hohlmann

5. 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 EIC Tracking Meeting - M. Hohlmann

6. 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 EIC Tracking Meeting - M. Hohlmann

7. 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 EIC Tracking Meeting - M. Hohlmann

8. 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 EIC Tracking Meeting - M. Hohlmann

9. 2012 EIC Proposal INPUT EIC Tracking Meeting - M. Hohlmann

10. 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

11. 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?)