RD51 Collaboration Meeting Nov 23, 2009

A High Eta Forward Muon Trigger and Tracking detector for CMS

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RD51 Collaboration Meeting Nov 23, 2009

RE1/1

RE1/2

RE1/3

RE2/1

RE2/2

RE2/3

RE3/1

RE3/2

RE3/3

RE4/1

RE4/2

RE4/3

No. of chambers 36*2 36*2 36*2 18*2 36*2 36*2 18*2 36*2 36*2 18*2 36*2 36*2

STAGED

Initial RE system –tailored to budget

Reduced RE system|h| < 1.6

h=2.4

h 2.4

2

Enhance and optimize the readout ( -h f) granularity by improved rate capability

Rate capability – 104/mm2

– Spatial resolution ~ 100 m (track< 45°)

– Time resolution ~ 1-3 ns (Gas!)– Efficiency > 98%– Rate capability > 5 kHz/cm2

- Argon CO2 (non flammable mixture - big plus)

MPGDs as candidate technology

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RD51 Collaboration Meeting Nov 23, 2009

Small proto-CMS-TG-01

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RD51 Collaboration Meeting Nov 23, 2009

Small proto-CMS-MM-01

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RD51 Collaboration Meeting Nov 23, 2009

2900 3000 3100 3200 3300 3400 3500 36000

2000

4000

6000

8000

10000

12000

EFFIICIENCY STUDIES WITH TRIPLE GEM ARGON CO2 90-10

Counts/10 s

HV Drift (Volts)

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RD51 Collaboration Meeting Nov 23, 2009

GAIN STUDIES WITH TRIPLE GEM ARGON CO2 CURRENT WITH Cu X-Rays

GAIN

HV Drift (Volts)3000 3100 3200 3300 3400 3500 3600 3700 38000

5000

10000

15000

20000

25000

90-10 80-20

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RD51 Collaboration Meeting Nov 23, 2009

2.50E+04 2.50E+05 2.50E+060

5000

10000

15000

20000

25000

30000

RATE CAPABILITY STUDIES WITH TRIPLE GEM ARGON CO2 90-10

GAIN

RATE PHOTONS/mm2

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RD51 Collaboration Meeting Nov 23, 2009

DISCHARGE STUDIES WITH TRIPLE GEM ARGON CO2

DIS

CHAR

GE

PRO

BABI

LTY

HV Drift (Volts)

3680 3700 3720 3740 3760 3780 3800 3820 3840 3860 38800.00E+00

2.00E-04

4.00E-04

6.00E-04

8.00E-04

1.00E-03

1.20E-03

90-10 80-20

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Decided to go ahead with Triple GEM based on dischargestudies and experience within CMSMPGD community

RD51 Collaboration Meeting Nov 23, 2009

1. Detail mechanical design 2. Definition of the readout electronics and it's mechanical

support3. Services and routing4. Mockup realization of the detector5. Production of the prototype

PROTOTYPE Plan:

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RD51 Collaboration Meeting Nov 23, 2009

mmR inner = 879.84 R Outer = 2639

Z = 5854

High Eta MPGD Prototype for 1/1 Space

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42.5 cm

35.9 cm35.6 cm

31.5 cm31.4 cm

27.8 cm27.5 cm

24 cm

32.2cm

24.4 cm

20.2 cm

21.5 cm

Sensitive Area & Readout Plane Sizes for CMS high 1/1h

43x33=141936x25=90032x20=64028x22=616

According to presentSensitive area coverage

These are routine for Workshop : cm

Can extend coverage by 5-7 %PLUS Extend further toEta 2.2 ?

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13

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Hans Postema, Stephane Bally, Antonio Conde, Gerard FaberNov 19, 2009

Is it possible to increase the eta coverage from 2.1 to > 2.2 ? There are mechanical (and installation) constraints to be understood.

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Hans Postema, Stephane Bally, Antonio Conde Garcia, Gerard FaberNov 19, 2009

Discussion on what is the optimum overlap for GEMs inside the mechanical envelope, given that the two planes of staggered chambers will make them asymmetric. Need to understand the optimum overlap. Can there be two different kinds of chambers?

H.V Divider: location and distribution of feed-throughs

Optimum frame widths given that gas will be flowing via grooves on the frames. Input and output locations, direction of flow...

A large stretching tool has been designed and built.The frame gluing will be performed by using the “vacuum bag” technique, tested in the construction of the CGEM

With the usual 1 kg/cm, finite element simulation indicates a maximum gravitational/electrostatic sag of the order of 20 μm

R&D on large GEM: the construction toolsG. Bencivenni

Gauge meters

Load Cells

Jaws

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RD51 Collaboration Meeting Nov 23, 2009

Test beam at SPS H4 Oct 21-Nov 2

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RD51 Collaboration Meeting Nov 23, 2009 18

First Results – to be studied in detail

- See talk by G. Croci - 09:00-

>13:00 WG7: Common Test Facilities

Beam Test and thereafter

- During the Beam Test and later back in the lab the CMS GEM has been working fine, data has been taken.- Unfortunately, lots of discharges have been observed during beam in the CMS microMegas prototypeBACK IN THE LAB Read the CMS GEM with VFAT electronics and play with Ar-CO2-CF4 Gas mixture. Understand the timing performance of the detector.

- See talk by G. Croci - 09:00-

>13:00 WG7: Common Test Facilities

CMS MPGDActivities since August 2009

1. Assembly and test of two small MPGD prototypes- Micromegas - Triple Gem

2. Planning for mock up of large prototype- Size and envelope limitations- Drawings

3. Participated in Beam test Oct-09- Overall good performance for Triple GEM- Readout electronics

4. Preparation on for building real size GE1/1 prototype

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RD51 Collaboration Meeting Nov 23, 2009

Next Steps..

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1. Analyze beam test data2. Build large size mock up to understand services3. Build large size prototype to understand performance4. Calculate rates as a function of eta-phi5. Background simulations, measurements and calculations6. Road for muon say 10 GeV, as a function of trigger sectors7. Stagger / Layer the detector for avoiding fake hits8. Engineering Design up to eta 2.49. Evaluate the improvement in

trigger and tracking efficiency10. Build Two 1/1 size chambers 2010 11. Six 1/1 size chambers 201112. Install six chamber in 2011/2012 shutdown (tba)

RD51 Collaboration Meeting Nov 23, 2009

This talk is on behalf of collaborators from:CERN + RD51Gent BelgiumLNF FrascatiSiennaFlorida TechBHU India

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