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M. Staib , M. Abercrombie, B. Benson, K. Gnanvo, M. Hohlmann

Characterization of triple-GEM detectors constructed with a low-cost stretching technique using infrared heating. M. Staib , M. Abercrombie, B. Benson, K. Gnanvo, M. Hohlmann Department of Physics and Space Sciences Florida Institute of Technology. Presentation Outline. Outline GEM Design

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M. Staib , M. Abercrombie, B. Benson, K. Gnanvo, M. Hohlmann

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  1. Characterization of triple-GEM detectors constructed with a low-cost stretching technique using infrared heating M. Staib, M. Abercrombie, B. Benson, K. Gnanvo, M. Hohlmann Department of Physics and Space Sciences Florida Institute of Technology

  2. Presentation Outline Outline GEM Design GEM Stretching IR GEM Stretching Characterization Future Work • GEM detector design for ft3 MT station • GEM stretching and framing by IR thermal method • Gain uniformity measurements of detectors fabricated using this new method • Future work regarding implementation of these detectors into our ft3 muon tomography station

  3. Gas Electron Multiplier (GEM) Detector Outline GEM Design GEM Stretching IR GEM Stretching Characterization Future Work V GEM foil under electron microscope (F. Sauli) ~400 V μ- e-

  4. Outline GEM Design GEM Stretching IR GEM Stretching Characterization Future Work Triple-GEM Detector for MT station 30 cm x 30 cm triple-GEM detectors for muon tomography based on design used for the COMPASS experiment at CERN and are operated in Ar/CO2 70:30 mixture X-Y Cartesian readout strips 1568 strips per detector 400 μm pitch Drift Cathode GEM foil FR4 Spacer Frame X-Y Readout Assembled GEM Detector COMPASS Design Nucl. Inst. and Meth. A 490 (2002) 177–203

  5. Outline GEM Design GEM Stretching IR GEM Stretching Characterization Future Work Traditional GEM Foil Stretching • GEM foils lack mechanical rigidity and must be stretched and framed before being assembled into a detector. • Traditional methods of tensioning the foils are expensive to implement. • Stretching must take place under clean room conditions. Framed GEM Foil Mechanical (INFN) Thermal (CERN/FIT)

  6. Low-Cost GEM Stretching Using IR Heating Outline GEM Design GEM Stretching IR GEM Stretching Characterization Future Work

  7. Low-Cost GEM Stretching Using IR Heating Outline GEM Design GEM Stretching IR GEM Stretching Characterization Future Work Two 30 cm x 30 cm detectors were assembled at FIT using GEM foils tensioned by IR heating Framed GEM Foil Gas In 128 Strip Readout Connectors 30 x 30 cm2 Active Area HV Divider Board Gas Out

  8. CMS Upgrade Using GEM Detectors Outline GEM Design GEM Stretching IR GEM Stretching Characterization Future Work Framed GEM Foil Gas In ~1 m Potential muon upgrade at CMS using GEMs for triggering & tracking (A. Sharma, S. Colafranceschi)

  9. Scaled-up IR Array for Large Area GEM Outline GEM Design GEM Stretching IR GEM Stretching Characterization Future Work We have scaled up our design in order to stretch foils as large as 1 m x 0.5 m Wedge shaped drift foil for proposed CMS endcap upgrade using GEMs in the high-η region

  10. Scaled-up IR Array for Large Area GEM Outline GEM Design GEM Stretching IR GEM Stretching Characterization Future Work Temperature profile of Plexiglas stretching frame

  11. Outline GEM Design GEM Stretching IR GEM Stretching Characterization Future Work Gain Uniformity Measurement The gain uniformity was measured using spectra obtained from a Cd-109 gamma source.

  12. Outline GEM Design GEM Stretching IR GEM Stretching Characterization Future Work Why use 109Cd for Uniformity Measurements? • Only about 5% of the x-rays produced by 55Fe pass through the honeycomb cover into the drift region where they can be detected. • 55Fe measurement is very slow, impractical for a large study. • We can observe copper K-line fluorescence from within the detector using a 109Cd source. 55Fe Spectrum (16 Hours) 109Cd Spectrum(1 Hour) 5.9 keV Copper K-line Emission 2.9 keV

  13. Outline GEM Design GEM Stretching IR GEM Stretching Characterization Future Work Gain Uniformity Measurement Top Strip Uniformity GEM Detector 9

  14. Outline GEM Design GEM Stretching IR GEM Stretching Characterization Future Work Gain Uniformity Measurement Bottom Strip Uniformity GEM 9 No-peak Measurement

  15. Outline GEM Design GEM Stretching IR GEM Stretching Characterization Future Work Gain Uniformity Measurement GEM 10 Uniformity Some problems in one corner visible on both readout axes Top Strip Uniformity Bottom Strip Uniformity

  16. Future Work Outline GEM Design GEM Stretching IR GEM Stretching Characterization Future Work • The GEMs assembled at Florida Tech are currently en route to CERN for use in our ft3 muon tomography station. • We are implementing full readout of all 10 detectors (~16k channels!) and will continue characterization using complete readout electronics. • We are working with the CMS collaboration to scale up our IR stretching method for a proposed upgrade to the muon system using large area GEM detectors.

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