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CONSTRUCTION AND TEST CMS 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. for

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construction and test cms ns2 gems ge1 1

CONSTRUCTION AND TESTCMS NS2 GEMs (GE1/1)

Yi Zhou, Christopher Armaingnaud, Jeremie Merlin, Stefano Colafranceschi, LieselotteMoreels, Emmanuel Rohee, Hugo Buhours, Dylan Furic, AndreyMarinov, LeszekRopelewski, EraldoOliveri,

Rui De Oliveira, Archana Sharma

for

GEMs for CMS Collaboration

& RD51

RD51 Collaboration Meeting Stony Brook Oct 2012

introduction the cms g em e ndcap system
Introduction: the CMS GEM Endcap system

GEM Detectors

Superchambers

GE1/1

GE2/1

slide4

MASS : 9,2 Kg

Recent 20mm elongation

In this direction (HV Div.)

III GEM WORKSHOP

ge1 1 prototypes proto1 readout pcb with strips
GE1/1 Prototypes – Proto1Readout PCB with strips

0.8mm pitch

128 channels per VFAT connector

1.6mm pitch

256 strips for each eta partition

PCB thickness = 3mm

1024 channels

slide8

Pins

Springs

Canons Filetes

  • Figure1 The HV divider
4 detectors completed
4 detectors completed

NS2 Technique

  • 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
power supply
Power supply

Ceramic divider distributing the High Voltage among the 3 GEMs

gain calibration
Gain calibration

CMS – GE1/1 – NS2 prototype

gain calibration1
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 sectors
  • All the sectors are working
  • The GEM stretching system is suitable
  • Gain VS chamber HV supply
gain calibration2
Gain calibration

Experimental Setup

Prototype 1

Copper X – ray (8KeV)

Holes

Electronic modules

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