CONSTRUCTION AND TESTCMS NS2 GEMs (GE1/1)

Yi Zhou, Christopher Armaingnaud, Jeremie Merlin, Stefano Colafranceschi, Lieselotte Moreels, Emmanuel Rohee, Hugo Buhours,

Dylan Furic, Andrey Marinov, Leszek Ropelewski, Eraldo Oliveri,Rui De Oliveira, Archana Sharma

forGEMs for CMS Collaboration

& RD51

RD51 Collaboration Meeting Stony Brook Oct 2012

Introduction: the CMS GEM Endcap system

GEM Detectors

2

GE1/1GE2/1

Superchambers

GE1/1 Detector Layout

GE1/1 Proto1 GE1/1 Proto2Drift, GEM1 = 3mm

Drift, GEM1 = 3mm

GEM1, GEM2 = 2mm

GEM1, GEM2 = 1mm

GEM2, GEM3 = 2mm

GEM2, GEM3 = 2mm

GEM3, Readout = 2mm

GEM3, Readout = 1mm

III GEM WORKSHOP 418/04/2012

MASS : 9,2 Kg

Recent 20mm elongationIn this direction (HV Div.)

III GEM WORKSHOP 518/04/2012

GE1/1 Prototypes – Proto1Readout PCB with strips

0.8mm pitch1.6mm pitch256 strips for each eta partition

128 channels per VFAT connector

PCB thickness = 3mm1024 channels

Pins SpringsCanons Filetes

4 detectors completed

• No spacers in active area• Assembly time : 2 hours• No gluing, no soldering• Re-opening possible• GEM exchange possible• No stretch degradation with

time• Stretching more intense

NS2 Technique

Power supply

Ceramic divider distributing the High Voltage among the 3 GEMs

Gain calibration CMS – GE1/1 – NS2 prototype

Gain calibration

• For each sector (24 readout sectors) :– Counts VS chamber HV supply– Output current– Position of the X-ray peak

• We want to see if : The gain is uniform for all the readout sectorsAll the sectors are workingThe GEM stretching system is suitable

Gain VS chamber HV supply

Gain calibration Experimental Setup

Copper X – ray (8KeV)

Electronic modules

• Gas mixture Ar - CO2 (70%/30%)• Gas flow : 5L/hour

Holes

Prototype 1

Gain calibration

29503000

30503100

31503200

32503300

33503400

34503500

35503600

10

100

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10000

Gain VS high voltage applied

sector1-4sector1-5sector1-8sector2-5sector2-6sector3-4sector3-5sector3-6sector3-8sector1-1sector1-2sector1-3

H.V.

Gain

Chamber 1

gain1-1

gain1-3

gain1-5

gain1-7

gain2-1

gain2-3

gain2-5

gain2-7

gain3-1

gain3-3

gain3-5

gain3-7

0100020003000400050006000700080009000

10000

Gain (3600V)

Gain (3600V)

Gain calibration

1 2 3 4 5 6 7

0

2000

4000

6000

8000

10000

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raw 1raw 2

raw 3

Gain VS sector position

raw 1raw 2raw 3

Gain

Chamber 1