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

Abstract

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 by 10 cm triple-GEM detector scanned with a strongly collimated X-ray gun on a 2D motorized stage. Angular resolutions of60-84 urad 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 um.

16 pages, 18 figures, submitted to NIM A

References in corpus (3)

• Performance of a Large-area GEM Detector Read Out with Wide Radial Zigzag Strips
• A Study of a Mini-drift GEM Tracking Detector
• R&D on GEM Detectors for Forward Tracking at a Future Electron-Ion Collider

Cited by in corpus (6)

• Design Studies for a TPC Readout Plane Using Zigzag Patterns with Multistage GEM Detectors
• A Comparative Study of Straight-Strip and Zigzag-Interleaved Anode Patterns for MPGD Readouts
• Reduction of ion back flow using a quadruple GEM detector with various gas mixtures
• Performance of a triple-GEM detector with capacitive-sharing 3-coordinate (X-Y-U)-strip anode readout
• Study of hard and electromagnetic processes at CERN-SPS energies: an investigation of the high-${\mu }_{\mathbf{B}}$ region of the QCD phase diagram with NA60+
• Low-mass GEM detector with radial zigzag readout strips for forward tracking at the EIC