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Characterization and test beam results of novel triple-GEM readout structures

78th Annual Meeting March 7, 2014 Indian River State College. Characterization and test beam results of novel triple-GEM readout structures. J. Twigger , M. Hohlmann, V. Bhopatkar, M. Phipps, A. Zhang Florida Institute of Technology Melbourne, FL. Motivations. Characterization

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Characterization and test beam results of novel triple-GEM readout structures

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  1. 78th Annual Meeting March 7, 2014 Indian River State College Characterization and test beam results of novel triple-GEM readout structures J. Twigger, M. Hohlmann, V. Bhopatkar, M. Phipps, A. Zhang Florida Institute of Technology Melbourne, FL

  2. Motivations • Characterization • Before our detectors were transported to and tested at Fermilab National Accelerator Laboratory we wanted to understand their individual responses to irradiation. • This testing process also gave us an ideal situation within which to test the limits of our Data Acquisition system and online monitoring abilities.

  3. Self-Triggered DAQ Mini-X Pre-amplifier Readout electronics Linear Amplifier SRS Computer

  4. Self-Triggered DAQ Use of an Amptek portable X-ray source allows us to irradiate selectively. For situations where we wish to study gain uniformity, the source may be positioned several centimeters away from the surface of the detector to allow a cone of radiation roughly uniform in a 30 degree cone.

  5. The Beam Line CMS Detector Trackers Trackers

  6. Beam Line Operation

  7. Beam Line Operation 20 GeV Beam

  8. Beam Line Operation 32 GeV Beam

  9. Detector Misalignment Before the implementation of fine alignment methods, the positions for corresponding events were plotted against each other. From these plots we can spot the shifts between detector planes.

  10. Spatial Resolution Before the implementation of track building into our data analysis the easiest way to calculate the resolution of our zigzag readout structures was to calculate the difference in returned position for our most closely spaced detectors

  11. Delta-Y Calculation Reconstructed cluster positions Real Track y The difference between reconstructed positions for each detector is plotted and fitted to determine resolution 2.2

  12. Measured Resolution As expected we see a decrease in spatial resolution with increasing detector high voltage. In order to define a proper operating voltage for this readout structure we must find a balance between detector efficiency and spatial resolution

  13. Conclusions • All detectors, electronic systems, and readout • designs performed successfully under • commissioning at FIT. • Initial results from our test beam studies show that • are detectors are operating as expected, even with • novel readout designs. • Construction and testing for large-scale • manufacturing of GE1/1 prototypes can • commence with similar techniques.

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