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Triple GEM Tracking Detectors for COMPASS

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Presentation on theme: "Triple GEM Tracking Detectors for COMPASS"— Presentation transcript:

1 Triple GEM Tracking Detectors for COMPASS
This presentation will probably involve audience discussion, which will create action items. Use PowerPoint to keep track of these action items during your presentation In Slide Show, click on the right mouse button Select “Meeting Minder” Select the “Action Items” tab Type in action items as they come up Click OK to dismiss this box This will automatically create an Action Item slide at the end of your presentation with your points entered. Triple GEM Tracking Detectors for COMPASS Klaus Dehmelt

2 FAS 2003 – K. Dehmelt – March, 21st
A COmmon Muon and Proton Apparatus for Structure and Spectroscopy  COMPASS Measurement of Gluon polarization DG/G due to cross-section differences (asymmetry) of open charm production (among other things) ECAL1+2 m-Wall 1+2 RICH SM1+2 HCAL Tracking Polarized target DC MicroMegas FAS 2003 – K. Dehmelt – March, 21st

3 FAS 2003 – K. Dehmelt – March, 21st
Small Area Tracking (SAT) GEM (Gas Electron Multiplier) Cover area up to ~20 cm around beam 7 stations with 14 detectors in 2001 10 stations with 20 detectors in 2002 Each station equipped with two Triple-GEM-detectors, rotated by 45º with respect to each other FAS 2003 – K. Dehmelt – March, 21st

4 FAS 2003 – K. Dehmelt – March, 21st
GEM - Basics GEM structure: photolithography – etching (A. Gandi, R. de Oliveira) FAS 2003 – K. Dehmelt – March, 21st

5 GEM - Basics Applied potential difference DU ~ 500V between electrodes
FAS 2003 – K. Dehmelt – March, 21st

6 FAS 2003 – K. Dehmelt – March, 21st
COMPASS - GEMs GEM: COMPASS design Ar/CO2 (70/30) FAS 2003 – K. Dehmelt – March, 21st

7 FAS 2003 – K. Dehmelt – March, 21st
COMPASS - GEMs GEM: COMPASS design 2-Dim Readout structure m FAS 2003 – K. Dehmelt – March, 21st

8 FAS 2003 – K. Dehmelt – March, 21st
COMPASS - GEMs GEM: COMPASS design FAS 2003 – K. Dehmelt – March, 21st

9 FAS 2003 – K. Dehmelt – March, 21st
COMPASS - GEMs Triple-GEM properties Single U0=4050 V G ~ 8000 FAS 2003 – K. Dehmelt – March, 21st

10 FAS 2003 – K. Dehmelt – March, 21st
COMPASS - GEMs Triple-GEM properties FAS 2003 – K. Dehmelt – March, 21st

11 FAS 2003 – K. Dehmelt – March, 21st
COMPASS - GEMs Triple-GEM properties Charge correlation ~ 1 Narrow correlation s ~ 0.1  Resolve hit ambiguities FAS 2003 – K. Dehmelt – March, 21st

12 FAS 2003 – K. Dehmelt – March, 21st
COMPASS - GEMs Triple-GEM properties Absolute efficiency G ~ 8000 FAS 2003 – K. Dehmelt – March, 21st

13 FAS 2003 – K. Dehmelt – March, 21st
COMPASS - GEMs Triple-GEM properties Spatial resolution s < 50mm FAS 2003 – K. Dehmelt – March, 21st

14 FAS 2003 – K. Dehmelt – March, 21st
COMPASS – GEMs Performance Hit map: Positions of maximum clusters for each event (2.1 x 108 m per spill) FAS 2003 – K. Dehmelt – March, 21st

15 FAS 2003 – K. Dehmelt – March, 21st
COMPASS – GEMs Performance Hit map: Correlation between two different detectors, 0.5 m apart in beam direction (2.1 x 108 m per spill) FAS 2003 – K. Dehmelt – March, 21st

16 FAS 2003 – K. Dehmelt – March, 21st
Summary GEM detectors meet requirements for tracking devices in modern HEP experiments: High rate capability High spatial resolution Large active area Low material budget No aging observed for COMPASS Triple GEM GEM detectors will contribute to success of COMPASS FAS 2003 – K. Dehmelt – March, 21st

17 The Group B. Ketzer, M.C. Altunbas, K. Dehmelt,
J. Ehlers, J. Friedrich, B. Grube, S. Kappler, I. Konorov, S. Paul, A. Placci, L. Ropelewski, and F. Sauli FAS 2003 – K. Dehmelt – March, 21st

18 FAS 2003 – K. Dehmelt – March, 21st
A COmmon Muon and Proton Apparatus for Structure and Spectroscopy  COMPASS ECAL1+2 m-Wall 1+2 RICH SM1+2 HCAL Tracking Polarized target DC MicroMegas Fixed Target Experiment at SPS-CERN FAS 2003 – K. Dehmelt – March, 21st

19 FAS 2003 – K. Dehmelt – March, 21st
A COmmon Muon and Proton Apparatus for Structure and Spectroscopy  COMPASS ECAL1+2 m-Wall 1+2 RICH SM1+2 HCAL Tracking Polarized target DC MicroMegas FAS 2003 – K. Dehmelt – March, 21st

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