# A new amplification structure for time projection chambers based on electroluminescence

## TL;DR

This paper introduces a simple, scalable, and robust hole-type electroluminescence amplification structure for time projection chambers, demonstrating promising energy resolution and optical gain in pure xenon at high pressure.

## Contribution

The paper presents a novel hole-type electroluminescence structure that is easy to manufacture, scalable, and operates effectively in high-pressure xenon for TPCs.

## Key findings

- Energy resolution of 18.9% at 10 bar for $^{55}$Fe x-rays
- Optical gain of 500 photons per electron
- Stable operation at high reduced electric fields

## Abstract

A simple hole-type secondary scintillation structure (2 mm-hole, 5 mm-pitch, 5 mm-thickness) is introduced and its operation demonstrated in pure xenon in the pressure range 2-10 bar. The new device, characteristically translucent, has been manufactured through a collaboration between IGFAE and the CERN workshop, and relies entirely on radiopure materials (acrylic and copper), being extremely rugged in the presence of sparks, mechanically robust, and easily scalable, yet made through a relatively simple process. With an overall figure (at 10 bar) characterized by an energy resolution of 18.9%(FWHM) for $^{55}$Fe x-rays, an optical gain of m$_\gamma$ = 500 ph/e, and a stable operation at reduced fields more than twice those of some of the presently running experiments ($E_{EL}=3$ kV/cm/bar), this family of structures seems to show great promise for electroluminescence readouts on large scale detectors. As argued below, further improvements have the potential of bringing the energy resolution close to the Fano factor and increasing the optical gain.