Performance of a large-area GEM detector read out with wide radial zigzag strips
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- 作者：Aiwu Zhang ; azhang@fit.edu" class="auth_mail" title="E-mail the corresponding author ; Vallary Bhopatkar ; Eric Hansen ; Marcus Hohlmann ; Shreeya Khanal ; Michael Phipps ; Elizabeth Starling ; Jessie Twigger ; Kimberly Walton
- 关键词：MPGD ; GEM ; Zigzag readout strip ; Beam test ; Angular resolution
- 刊名：Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
- 出版年：2016
- 出版时间：1 March 2016
- 年：2016
- 卷：811
- 期：Complete
- 页码：30-41
- 全文大小：7598 K
文摘
A 1-meter-long trapezoidal Triple-GEM detector with wide readout strips was tested in hadron beams at the Fermilab Test Beam Facility in October 2013. The readout strips have a special zigzag geometry and run radially with an azimuthal pitch of 1.37 mrad to measure the azimuthal ϕ-coordinate of incident particles. The zigzag geometry of the readout reduces the required number of electronic channels by a factor of three compared to conventional straight readout strips while preserving good angular resolution. The average crosstalk between zigzag strips is measured to be an acceptable 5.5%. The detection efficiency of the detector is (98.4±0.2)%. When the non-linearity of the zigzag-strip response is corrected with track information, the angular resolution is measured to be (193±3) μrad, which corresponds to 14% of the angular strip pitch. Multiple Coulomb scattering effects are fully taken into account in the data analysis with the help of a stand-alone Geant4 simulation that estimates interpolated track errors.