Long Term Operation and Plans for Tests at GIF

CMS GEM Upgrade Workshop III

Jeremie MERLIN and Christopher Armaingaud(University of Strasbourg*)

* Also at Telecom Physique Strasbourg April 20,2012

Long Term Operation and Plans for Tests at GIF

Jeremie MERLIN

Christopher ArmaingaudApril 20,2012CMS GEM Upgrade Workshop III

Introduction to the ageing process

The ageing process Polymer formation in the avalanche plasma Direct deposition of pollutants Appearance of reactive gas/products in the avalanche process

From M. Capeans, Ageing of Gaseous Detectors : assembly materials and procedures, CERN

2/9

Long Term Operation and Plans for Tests at GIF

Jeremie MERLIN

Christopher ArmaingaudApril 20,2012CMS GEM Upgrade Workshop III

Introduction to the ageing process

The aim of the ageing test Ensure a long term operation in CMS Understand the effects of the radiation on the materials If there is ageing, understand its origin and propose solutions

50μm

3/9

Long Term Operation and Plans for Tests at GIF

Jeremie MERLIN

Christopher ArmaingaudApril 20,2012CMS GEM Upgrade Workshop III

The previous ageing measurements-double GEM-

Standard operation conditions Ar/CO2 : 70/30

Setup 6 keV X-rays, rate: 4,75.104 Hz/mm2

Drift: 2kV/cm , Others: 4kV/cm Gain: 2,2.103

Data from S. Bachmann et al.,Development and test of large size GEM detectors, IEEE Trans. Nucl. Sci. NS-47 (2000) 1412

4/9

Long Term Operation and Plans for Tests at GIF

Jeremie MERLIN

Christopher ArmaingaudApril 20,2012CMS GEM Upgrade Workshop III

The previous ageing measurements-triple GEM-

Standard operation conditions Ar/CO2 : 70/30

Setup 8,9 keV X-rays, rate: 103 - 104 Hz/mm2

Drift: 2,5kV/cm , Others: 3,7kV/cm Gain: 8,5.103

Data from M. C. Altunbas et al., Aging Measurements with the Gas Electron Multiplier (GEM), CERN-EP/2001-091

5/9

Long Term Operation and Plans for Tests at GIF

Jeremie MERLIN

Christopher ArmaingaudApril 20,2012CMS GEM Upgrade Workshop III

The ongoing ageing test

Standard operation conditions Ar/CO2/CF4 : 45/15/40

Setup 137Cs source, A: 566 GBq Drift: 3kV/cm , Others: 3,5kV/cm-5kV/cm Gain: 8.103 - 104

During 6 months in the GIF

6/9

Long Term Operation and Plans for Tests at GIF

Jeremie MERLIN

Christopher ArmaingaudApril 20,2012CMS GEM Upgrade Workshop III

The ongoing ageing test-Gamma Irradiation Facility-

From I. Brunner, Integrated dose around the GIF installation from June to September 2004, CERN-SC-2004-077-RP-SN

GEM

lead

shi

eld

7/9

AmplifierPreamplifier50x

Input : negativeOutput Range : 10VInt/Diff : 0.25/0.25

BLR : out

unipolar

Discriminator

Linear fan in/fan out

Readout Connections

5 l/

h

Attenuator

GATE

ADC (965)

VME

CPU

C-programGND

PicoammeterGND

GPIB

LabView-program

Mass Chromatography

Gas Output

Gas input

Meteo Station

PressureTemp°Humidity

GND

LEAD SHIELDSWPC

SWPC

Dual Timer

VETO

GATE/RATE

Multii-Channels

Common Gate

GIF EXPERIMENTOVERVIEW

Power Supply System

HV

Long Term Operation and Plans for Tests at GIF

Jeremie MERLIN

Christopher ArmaingaudApril 20,2012

The ageing test-setup-

8/9

Long Term Operation and Plans for Tests at GIF

Jeremie MERLIN

Christopher ArmaingaudApril 20,2012CMS GEM Upgrade Workshop III

Thank you

9/9