Low-mass GEM detector with radial zigzag readout strips for forward tracking at the EIC

TL;DR

This paper details the design and construction of a low-mass, large-area Triple-GEM detector with innovative thin foil electrodes and radial zigzag readout strips, optimized for forward tracking at the future Electron-Ion Collider.

Contribution

It introduces a novel low-mass GEM detector with integrated drift and readout electrodes on thin foils, reducing material budget and improving uniformity for forward tracking applications.

Findings

Material budget reduced by a factor of seven

Achieved uniform drift and signal response across the detector

Implemented radial zigzag strips for cost-effective high-resolution readout

Abstract

We present design and construction of a large low-mass Triple-GEM detector prototype for forward tracking at a future Electron-Ion Collider. In this environment, multiple scattering of forward and backward tracks must be minimized so that electron tracks can be cleanly matched to calorimeter clusters and so that hadron tracks can efficiently seed RICH ring reconstruction for particle identification. Consequently, the material budget for the forward tracking detectors is critical. The construction of the detector builds on the mechanical foil stretching and assembly technique pioneered by CMS for the muon endcap GEM upgrade. As an innovation, this detector implements drift and readout electrodes on thin large foils instead of on PCBs. These foils get stretched mechanically together with three GEM foils in a single stack. This reduces the radiation length of the total detector material in the active area by a factor seven from over 4% to below 0.6%. It also aims at improving the uniformity of drift and induction gap sizes across the detector and consequently signal response uniformity. Thin outer frames custom-made from carbon-fiber composite material take up the tension from the stretched foil stack and provide detector rigidity while keeping the detector mass low. The gas volume is closed with thin aluminized polyimide foils. The trapezoidal detector covers an azimuthal angle of 30.1 degrees and a radius from 8 cm to 90 cm. It is read out with radial zigzag strips with pitches of 1.37 mrad at the outer radius and 4.14 mrad at the inner radius that reduce the number of required electronics channels and associated cost while maintaining good spatial resolution. All front-end readout electronics is located away from the active area at the outer radius of the trapezoid.