Presentation is loading. Please wait.

Presentation is loading. Please wait.

Gas Electron Multiplier

Published byLorena Logan Modified over 8 years ago

Similar presentations

Presentation on theme: "Gas Electron Multiplier"— Presentation transcript:

1 Gas Electron Multiplier
GEM DETECTORS Gas Electron Multiplier Bat-El Pinchasik, Technion Israel

2 GEM detectors main element
GEM foil Terminals 10 cm Kapton (polyimide) copper-clad on both sides Millions of holes!

3 GAS ATMOSPHERE CO2+ Argon GEM CATHODE ANODE DRIFT REGION
INDUCTION REGION segmentation Tracking, Triggering Etc..

4 Field lines Induction field Drift field GEM foil
Electrons follow the field lines Drift field GEM foil In the holes: high density of field lines 500 volts 50μm Induction field Electrons gain energy!

5 Electrons are shared between bottom GEM and anode
Simulation: Ions CATHODE Electron-Ion pair Drift field Top GEM Bottom Electrons are shared between bottom GEM and anode Induction field Gain of the detector ANODE

6 Area covered by a detector
Advantages Detector Area covered by a detector Cost (per area) Rate capability Aging process GEM detector $$ Low aging Wire chamber $ Gain loss and discharges increase Silicon detectors Noise and leakage current increase

7 Standard GEM Conical GEM First invented in 1998
Double conical geometry Used already in several experiments Conical GEM 42.5µm 98.9µm copper kapton Recent development! Easy to produce larger detectors low cost per area

8 Glance from above Standard GEM Conical GEM- Top Conical GEM-Bottom
Internal & External diameter 140 µm Conical GEM- Top Conical GEM-Bottom Larger diameter smaller 140 µm

9 Does a conical GEM have the same characteristics?
See the difference Large conical GEM foil 60 cm 10 X 10 cm Does a conical GEM have the same characteristics?

10 GAS ATMOSPHERE CO2+ Argon CATHODE Voltage over the GEM ANODE
Drift field ANODE Induction field Anode current

11 Electrons end up in Top GEM
Drift field scan GEM voltage: 500 volts E induction: 3 (kv/cm) plateau Recombination Electrons end up in Top GEM

12 Integration over distance
Gain vs. GEM voltage Gain Integration over distance Townsend coefficient Field & gas properties α Gain of the detector Log scale E induction: 3kv/cm E drift: 2 kv/cm Gem voltage (volt)

13 Electrons distribution
Induction scan Electrons distribution I anode (normalized) Increasing induction field More electrons get to the anode Higher signal E induction (volt/cm)

14 Conclusions Results Conical GEM has similar performance as standard GEM Advantages Low cost Larger area Easy to fabricate Conclusion Conical GEM is an attractive candidate to future LHC upgrades

15 Current applications COMPASS TOTEM LHCB LHCB muon And the future?

Download ppt "Gas Electron Multiplier"

Similar presentations

Triple-GEM detector operation for high-rate particle triggering W. Bonivento, G. Bencivenni, A. Cardini, C. Deplano, P. de Simone, F. Murtas, D. Pinci,

Triple-GEM detector operation for high-rate particle triggering W. Bonivento, G. Bencivenni, A. Cardini, C. Deplano, P. de Simone, F. Murtas, D. Pinci,
GEM Chambers at BNL The detector from CERN, can be configured with up to 4 GEMs The detector for pad readout and drift studies, 2 GEM maximum.

GEM Chambers at BNL The detector from CERN, can be configured with up to 4 GEMs The detector for pad readout and drift studies, 2 GEM maximum.
TIME 2005: TPC for the ILC 6 th Oct 2005 Matthias Enno Janssen, DESY 1 A Time Projection Chamber for the International Linear Collider R&D Studies Matthias.

TIME 2005: TPC for the ILC 6 th Oct 2005 Matthias Enno Janssen, DESY 1 A Time Projection Chamber for the International Linear Collider R&D Studies Matthias.
General Characteristics of Gas Detectors

General Characteristics of Gas Detectors
Standard GEM Charging Up Simulation: First test of the approach Matteo Alfonsi, Gabriele Croci, Serge Duarte Pinto, Leszek Ropelewski, Rob Veenhof, Marco.

Standard GEM Charging Up Simulation: First test of the approach Matteo Alfonsi, Gabriele Croci, Serge Duarte Pinto, Leszek Ropelewski, Rob Veenhof, Marco.
1 MUON TRACKER FOR CBM experiment Murthy S. Ganti, VEC Centre Detector Choice.

1 MUON TRACKER FOR CBM experiment Murthy S. Ganti, VEC Centre Detector Choice.
Drift velocity Adding polyatomic molecules (e.g. CH4 or CO2) to noble gases reduces electron instantaneous velocity; this cools electrons to a region where.

Drift velocity Adding polyatomic molecules (e.g. CH4 or CO2) to noble gases reduces electron instantaneous velocity; this cools electrons to a region where.
Atsuhiko Ochi Kobe University 4/10/2012 10 th RD51 collaboration meeting.

Atsuhiko Ochi Kobe University 4/10/ th RD51 collaboration meeting.
Bulk Micromegas Our Micromegas detectors are fabricated using the Bulk technology The fabrication consists in the lamination of a steel woven mesh and.

Bulk Micromegas Our Micromegas detectors are fabricated using the Bulk technology The fabrication consists in the lamination of a steel woven mesh and.
GEM Detector Shoji Uno KEK. 2 Wire Chamber Detector for charged tracks Popular detector in the particle physics, like a Belle-CDC Simple structure using.

GEM Detector Shoji Uno KEK. 2 Wire Chamber Detector for charged tracks Popular detector in the particle physics, like a Belle-CDC Simple structure using.
E-field calculations for the TPC/HBD N. Smirnov Upgrade Working Group Meeting 05/13/03, BNL.

E-field calculations for the TPC/HBD N. Smirnov Upgrade Working Group Meeting 05/13/03, BNL.
1 VCI, 21. 2. 2001 1Werner Riegler RPCs and Wire Chambers for the LHCb Muon System  Overview  Principles  Performance Comparison: Timing, Efficiency,

1 VCI, Werner Riegler RPCs and Wire Chambers for the LHCb Muon System  Overview  Principles  Performance Comparison: Timing, Efficiency,
Proportional Counters

Proportional Counters
D. Peterson, “ILC Detector Work”, Cornell Group Meeting, 4-October-2005 1 ILC Detector Work This project is supported by the US National Science Foundation.

D. Peterson, “ILC Detector Work”, Cornell Group Meeting, 4-October ILC Detector Work This project is supported by the US National Science Foundation.
RF test of the GEM detector prototipe Detector description RF test area (LINAC3) detector working conditions RF field measurement Detector measurements.

RF test of the GEM detector prototipe Detector description RF test area (LINAC3) detector working conditions RF field measurement Detector measurements.
Status of simulation studies of IBF for GEMs

Status of simulation studies of IBF for GEMs
TRAINING COURSE ON RADIATION DOSIMETRY: Instrumentation 1 – Gas detectors / Part 1 Anthony WAKER, University of Ontario Instutute of Technology Wed. 21/11/2012,

TRAINING COURSE ON RADIATION DOSIMETRY: Instrumentation 1 – Gas detectors / Part 1 Anthony WAKER, University of Ontario Instutute of Technology Wed. 21/11/2012,
Chamber parameters that we can modify and that affect the rising time Number of ionisation clusters produced in the drift gap: Poisson Distribution Probability.

Chamber parameters that we can modify and that affect the rising time Number of ionisation clusters produced in the drift gap: Poisson Distribution Probability.
1 Small GEM Detectors at STAR Yi Zhou University of Science & Technology of China.

1 Small GEM Detectors at STAR Yi Zhou University of Science & Technology of China.
June 9, 2008What’s a Drift Chamber? Mac Mestayer Drift Chambers: The Science behind the Art What are they? how do they work? ionization of the gas by particles.

June 9, 2008What’s a Drift Chamber? Mac Mestayer Drift Chambers: The Science behind the Art What are they? how do they work? ionization of the gas by particles.

Similar presentations

Ads by Google