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This update details the ongoing research and development of Gas Electron Multiplier (GEM) technology at the University of Virginia (UVa). It highlights the capabilities of the newly established clean room and GEM assembly facilities, including testing and commissioning of GEM chambers. We provide insights on the recent cosmic test results for the 40×50 cm² GEM prototype, chamber voltage behavior, and the development of a scalable readout system. Future plans for additional clean room space and further testing methods are discussed.
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Uva GEM R&D Update –Part I Kondo Gnanvo, Nilanga Liyanage, Vladimir Nelyubin, KiadtisakSaenboonruang, Taylor Scholz and AdarshRamakrishnan In Collaboration with EvaristoCisbani and Paolo Musico
Outline GEM R&D and assembly facilities at UVa Cosmic test results Update on the 40 × 50 cm2GEM prototype
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 cm2chambers • 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
GEM R&D and assembly facility at UVa New 40 cm x 50 cm GEM stretcher 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\ More detail in Kondo’s talk next week
Test framesglued More detail in Kondo’s talk next week
GEM R&D and assembly facility at UVa GEM foil and Frame HV test box More detail in Kondo’s talk next week
GEM R&D and assembly facility at UVa More detail in Kondo’s talk next week
GEM R&D and assembly facility at UVa More detail in Kondo’s talk next week
GEM R&D and assembly facility at UVa GEM foil and Frame HV test box More detail in Kondo’s talk next week
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. = 4100 V GEM 1: DV = 410 V GEM 2: DV = 373 V GEM 2: DV = 328 V
CMS Prototype Gain measurements with the divider K. Gnanvo - SoLID Coll. Meeting, 02/03/12
CMS Prototype Gain measurements with the divider K. Gnanvo - SoLID Coll. Meeting, 02/03/12
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 chamberswith X/Y readout • Currently running with a standalone ALICE DAQ (DATE) and Monitoring (AMORE) software. • Integration of the SRS into CODA under development
