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

R&D UPDATE

3/26/2012 2EIC Tracking Meeting - M. Hohlmann

First Test of Zigzag Readout

3/26/2012

APV25 Hybrid(using 38% of ch.)

+ SRS First commissioning step:• Measure pedestals and compare with regular straight strips• Does the noise increase substantially due to the

increased strip area and capacitance?

Readout Boardfor std. CERN10cm×10cmTriple-GEM Detector

2 sets of 10cm zigzag strips with different zigzag pitch (along strip)

BNL/FIT/SBU Collaboration

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2 mm 2 mm

24 finezigzagstrips

24 coarsezigzagstrips

LEMO footpads

Work done by grad. students Mike Staib & Vallary Bhopatkar

3EIC Tracking Meeting - M. Hohlmann

Pedestal Distributions

3/26/2012

Std. Triple-GEM with 10cm long straight strips Open Readout Board with 10cm long zigzag strips

ADC channel

# ev.perch.

ADC channel

# ev.perch.

ADC channel

# ev.perch.

ADC channel

# ev.perch.

APV ch. 31

APV ch. 63

12-bit SRS ADCs (4096 count range)

pedestal width: rms 3.1 → 3.7 cts.

4EIC Tracking Meeting - M. Hohlmann

Pedestals for 128 channels

3/26/2012

Open Readout Board with 10cm long zigzag strips

Pedestal width (rms)[ADC counts]

APV channel number

48 channels connectedto zigzag strips (24+24)

channels not connected

Channels connectedto LEMO footpads (5)

5EIC Tracking Meeting - M. Hohlmann

Pedestal Distributions

3/26/2012

Readout Board with 10cm long zigzag strips covered with one GEM foil placed 2 mm above induction plane:

ADC channel

# ev.perch.

ADC channel

# ev.perch.

APV ch. 31

APV ch. 63

pedestal width: rms 3.7 → 3.9 cts.

6EIC Tracking Meeting - M. Hohlmann

Pedestals for 128 channels

3/26/2012

Pedestal width (rms)[ADC counts]

APV channel number

48 channels connectedto zigzag strips (24+24)

channels not connected

Channels connectedto LEMO footpads (5)

Readout Board with 10cm long zigzag strips covered with one GEM foil placed 2 mm above induction plane:

7EIC 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 8EIC Tracking Meeting - M. Hohlmann

2012 EIC PROPOSAL INPUT

3/26/2012 9EIC 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 10

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?)11