Uva GEM R&D Update –Part I
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Transcript of Uva GEM R&D Update –Part I
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Uva GEM R&D Update –Part I
Kondo Gnanvo, Nilanga Liyanage, Vladimir Nelyubin, Kiadtisak Saenboonruang, Taylor Scholz and Adarsh
Ramakrishnan
In Collaboration with
Evaristo Cisbani and Paolo Musico
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Outline
GEM R&D and assembly facilities at UVa
Cosmic test results
Update on the 40 × 50 cm2 GEM prototype
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GEM R&D and assembly facility at UVa
A 3.5 × 3 m2 class 1000 clean room Used for the assembly of BigBite drift chambers
and GEM tracker with 10 × 10 cm2 chambers Located in a large (4.5 m x 9 m) semi-clean area. Accessories (clean room table, HV Gas box,…. Additional clean room to be added later this year
Setting up the GEM lab @ UVa the test and commissioning of the chambers 16 channels Wiener HV power supply (VME) Picoammeter model Keithley 6487 CODA based DAQ 2 APV readout systems
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GEM R&D and assembly facility at UVa The mechanical stretcher
Use for stretching GEM foil and glue it to spacer frames to keep it flat
Stretch the foil to a tension bigger than 1kg/cm
Method developed by Bencivenni. Et al. (LNF Italy) for LHCb GEM chambers\
New 40 cm x 50 cm GEM stretcher at Uva
More detail in Kondo’s talk next week
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Page 5More detail in Kondo’s talk next week
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Test frames glued
More detail in Kondo’s talk next week
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GEM R&D and assembly facility at UVa
GEM foil and Frame HV test box
More detail in Kondo’s talk next week
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GEM R&D and assembly facility at UVa
More detail in Kondo’s talk next week
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GEM R&D and assembly facility at UVa
More detail in Kondo’s talk next week
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GEM R&D and assembly facility at UVa
GEM foil and Frame HV test box
More detail in Kondo’s talk next week
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On going studies with 10 cm x 10 cm chambers compact voltage dividers from CERN
Gains, spark rates etc. well studied for this combination of resistors Nominal operation at 4100 V, but tested to 4300 V (Max voltage on a GEM
foil is 430 V; this is small compared to 500 V foil test voltage) If there a spark in the bottom GEM, DV for other GEMs increase by only
about 6 V. A spark in the other foils has negligible effect.
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GEM 1: DV = 410 V
GEM 2: DV = 373 V
GEM 2: DV = 328 V
= 4100 V
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K. Gnanvo - SoLID Coll. Meeting, 02/03/12
CMS Prototype Gain measurements with the divider
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K. Gnanvo - SoLID Coll. Meeting, 02/03/12
CMS Prototype Gain measurements with the divider
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GEM R&D and assembly facility at UVa
10 × 10 cm2 GEM prototypes
3 working chambers for the tracker,
2 mores to be assembled soon
trigger GEM chamber with pad readout
Scalable Readout System (SRS)
Multi channel scalable readout system developed by the CERN-based RD51 coll.
Small system @ UVa with up to 2048 ch 4 small GEM chambers with X/Y readout
Currently running with a standalone ALICE DAQ (DATE) and Monitoring (AMORE) software.
Integration of the SRS into CODA under development
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Cosmic test results
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Cosmic test results
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Cosmic test results
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Cosmic test results
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Cosmic test results
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Cosmic test results
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