A GEM Based TPC for the LEGS Experiment

Yu, B. X.; Geronimo, G. De; Fried, J.; Kandasamy, A.; Makowiecki, D.; Smith, Graham C.; Radeka, V.; Hoblit, S.; Sandorfi, A. M.; Thorn, C.; Norum, B.; Wang, K.; Mahon, J.

doi:10.1109/nssmic.2005.1596405

Cited by 9 publications

(5 citation statements)

References 3 publications

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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].…”

Section: Introductionmentioning

confidence: 76%

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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Section: Introductionmentioning

confidence: 76%

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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“…It can also be used as a TPC readout where a large number of individual pads are required that only require a high precision coordinate determination in one direction (e.g., r-), such as described in Refs. [4,5].…”

Section: Pulse Shape Deconvolution Methodsmentioning

confidence: 99%

“…Alternatively, a chevron style readout [2,3] can be used with relatively large pads (~ few mm) which exploit the charge sharing between interspersed electrodes within the chevron to achieve a resolution that is much smaller than the pad size. This type of readout has also been used for TPCs where a high degree of pad segmentation is required [4,5]. We have studied the minidrift GEM detector with a 2x10 mm 2 chevron pad readout, where fine chevon strips along the 2 mm direction provided precise position information, and the 10 mm dimension was chosen simply for segmentation purposes.…”

Section: Introductionmentioning

confidence: 99%

A Study of a Mini-Drift GEM Tracking Detector

Azmoun¹,

Ruzza²,

Franz³

et al. 2016

IEEE Trans. Nucl. Sci.

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Abstract-A GEM tracking detector with an extended drift region has been studied as part of an effort to develop new tracking detectors for future experiments at RHIC and for the Electron Ion Collider that is being planned for BNL or JLAB. The detector consists of a triple GEM stack with a small drift region that was operated in a mini TPC type configuration. Both the position and arrival time of the charge deposited in the drift region were measured on the readout plane which allowed the reconstruction of a short vector for the track traversing the chamber. The resulting position and angle information from the vector could then be used to improve the position resolution of the detector for larger angle tracks, which deteriorates rapidly with increasing angle for conventional GEM tracking detectors using only charge centroid information. Two types of readout planes were studied. One was a COMPASS style readout plane with 400 m pitch XY strips and the other consisted of 2x10mm 2 chevron pads. The detector was studied in test beams at Fermilab and CERN, along with additional measurements in the lab, in order to determine its position and angular resolution for incident track angles up to 45 degrees. Several algorithms were studied for reconstructing the vector using the position and timing information in order to optimize the position and angular resolution of the detector for the different readout planes. Applications for large angle tracking detectors at RHIC and EIC are also discussed.

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“…In applications with large-area GEM detectors, the use of readout strips with such small pitch will quickly lead to a large number of required electronic channels and consequently to significant system cost incurred by the readout electronics. Readout structures employing pads or strips with a chevron or zigzag geometry were proposed and studied in the past to address this issue for MPGDs and other gaseous detectors [4,5,6,7,8]. A zigzag strip covers a larger area than a standard straight strip, so that zigzag strips can reduce the number of electronic channels needed to read out a given detector area.…”

Section: Introductionmentioning

confidence: 99%

Performance of a large-area GEM detector read out with wide radial zigzag strips

Zhang

Bhopatkar

Hansen

et al. 2016

Nuclear Instruments and Methods in Physics Research Section A:

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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 along the radial direction 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.

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A GEM Based TPC for the LEGS Experiment

Cited by 9 publications

References 3 publications

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

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

A Study of a Mini-Drift GEM Tracking Detector

Performance of a large-area GEM detector read out with wide radial zigzag strips

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