A Study of a Mini-Drift GEM Tracking Detector

Azmoun, B.; Ruzza, B. Di; Franz, A.; Kiselev, A.; Pak, R.; Phipps, M. W.; Purschke, M. L.

doi:10.1109/tns.2016.2550503

Cited by 7 publications

(6 citation statements)

References 20 publications

(16 reference statements)

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“…However, this non-linearity can be corrected for by measuring the response of the pad in very fine steps. In order to measure this, the detector was configured as a "minidrift" detector with a 1.6 mm drift gap above the GEM [4,5] and scanned across the chevron direction using a highly collimated X-ray source. Figure 7 shows the measured response of the detector as a function of the source position and the differential non-linearity.…”

Section: Electrostatic Field Simulationsmentioning

confidence: 99%

A Prototype Combination TPC Cherenkov Detector with GEM Readout for Tracking and Particle Identification and its Potential Use at an Electron Ion Collider

et al. 2018

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Abstract. A prototype detector is being developed which combines the functions of a Time Projection Chamber for charged particle tracking and a Cherenkov detector for particle identification. The TPC consists of a 101010 cm 3 drift volume where the charge is drifted to a 1010 cm 2 triple GEM detector. The charge is measured on a readout plane consisting of 210 mm 2 chevron pads which provide a spatial resolution ~ 100 m per point in the chevron direction along with dE/dx information. The Cherenkov portion of the detector consists of a second 1010 cm 2 triple GEM with a photosensitive CsI photocathode on the top layer. This detector measures Cherenkov light produced in the drift gas of the TPC by high velocity particles which are above threshold. CF4 or CF4 mixtures will be used as the drift gas which are highly transparent to UV light and can provide excellent efficiency for detecting Cherenkov photons. The drift gas is also used as the operating gas for both GEM detectors. The prototype detector has been constructed and is currently being tested in the lab with sources and cosmic rays, and additional tests are planned in the future to study the detector in a test beam.

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Section: Electrostatic Field Simulationsmentioning

confidence: 99%

A Prototype Combination TPC Cherenkov Detector with GEM Readout for Tracking and Particle Identification and its Potential Use at an Electron Ion Collider

et al. 2018

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“…Later, MWPCs and GEMs were read out with parallel zigzag strips and good spatial resolutions were achieved [2,3]. This was confirmed in more recent studies which showed that the spatial resolution of a small GEM detector with parallel zigzag strip or zigzag pad readout can approach 70 µm [4,5]. We subsequently introduced radial zigzag strips to read out trapezoidal large-area GEM detectors [6], which are intended for tracking systems at future experiments, e.g.…”

Section: Introductionmentioning

confidence: 65%

“…In our previous studies [5,6], we observed a non-linear relation between incident particle position and hit position measured from charge sharing among radial zigzag readout strips. This paper aims at quantifying the non-linear response of our previous zigzag designs and to demonstrate an improved zigzag design that has a linear response.…”

Section: Introductionmentioning

confidence: 86%

A GEM readout with radial zigzag strips and linear charge-sharing response

Zhang¹,

Hohlmann²,

Azmoun³

et al. 2018

Nuclear Instruments and Methods in Physics Research Section A:

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We study the position sensitivity of radial zigzag strips intended to read out large GEM detectors for tracking at future experiments. Zigzag strips can cover a readout area with fewer strips than regular straight strips while maintaining good spatial resolution. Consequently, they can reduce the number of required electronic channels and related cost for large-area GEM detector systems. A non-linear relation between incident particle position and hit position measured from charge sharing among zigzag strips was observed in a previous study. We significantly reduce this non-linearity by improving the interleaving of adjacent physical zigzag strips. Zigzag readout structures are implemented on PCBs and on a flexible foil and are tested using a 10 cm × 10 cm triple-GEM detector scanned with a strongly collimated X-ray gun on a 2D motorized stage. Angular resolutions of 60-84 µrad are achieved with a 1.37 mrad angular strip pitch at a radius of 784 mm. On a linear scale this corresponds to resolutions below 100 µm.

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“…Roughly half of all the clusters of charge collected by each pad-row fired a single pad, so interpolating the hit position was not possible. This resulted in a significant degradation of the single point resolution for pad rows with only one pad firing [9]. For this reason, tracks were only reconstructed for events where at least three pad-rows consisted of 2 or more fired pads.…”

Section: A Tpc Detectormentioning

confidence: 99%

Results From a Prototype Combination TPC Cherenkov Detector With GEM Readout

Azmoun

Dehmelt

Hemmick

et al. 2019

IEEE Trans. Nucl. Sci.

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A combination Time Projection Chamber-Cherenkov prototype detector has been developed as part of the Detector R&D Program for a future Electron Ion Collider. The prototype was tested at the Fermilab test beam facility to provide a proof of principle to demonstrate that the detector is able to measure particle tracks and provide particle identification information within a common detector volume. The TPC portion consists of a 10x10x10cm 3 field cage, which delivers charge from tracks to a 10x10cm 2 quadruple GEM readout. Tracks are reconstructed using charge and timing information from clusters collected on an array of 2x10mm 2 zigzag pads. The Cherenkov portion consists of a 10x10cm 2 readout plane segmented into 3x3 square pads, also coupled to a quadruple GEM. As tracks pass though the drift volume of the TPC, the generated Cherenkov light is able to escape through sparsely arranged wires making up one side of the field cage, facing the CsI photocathode of the Cherenkov detector. The Cherenkov detector is thus operated in a windowless, proximity focused configuration for high efficiency. Pure CF4 is used as the working gas for both detector components, mainly due to its transparency into the deep UV, as well as its high N0. Results from the beam test, as well as results on its particle id capabilities will be discussed.

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A Study of a Mini-Drift GEM Tracking Detector

Cited by 7 publications

References 20 publications

A Prototype Combination TPC Cherenkov Detector with GEM Readout for Tracking and Particle Identification and its Potential Use at an Electron Ion Collider

A Prototype Combination TPC Cherenkov Detector with GEM Readout for Tracking and Particle Identification and its Potential Use at an Electron Ion Collider

A GEM readout with radial zigzag strips and linear charge-sharing response

Results From a Prototype Combination TPC Cherenkov Detector With GEM Readout

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