Performance of an optically read out time projection chamber with ultra-relativistic electrons
Abstract
The Time Projection Chamber (TPC) is an ideal candidate to finely study the charged particle ionization in a gaseous medium. Large volumes TPCs can be read out with a suitable number of channels offering a complete 3D reconstruction of an ultra-relativistic charged particle track, that is the sequence of its energy releases in the TPC gas volume. Moreover, He-based TPCs are very promising to study keV energy particles as nuclear recoils, opening the possibility for directional searches of Dark Matter (DM) and the study of Solar Neutrinos (SN). In this paper, we report the analysis of the data acquired with a small TPC prototype (named LEMOn) built by the CYGNO collaboration that was exposed to a beam of 450 MeV electrons at the Beam Test Facility of National Laboratories of Frascati. LEMOn is operated with a He-CF4 mixture at atmospheric pressure and is based on a Gas Electron Multipliers amplification stage that produces visible light collected by a sub-millimeter position resolution scientific CMOS camera. This type of readout - in conjunction with a fast light detection - allows a 3D reconstruction of the electrons' tracks. The electrons are leaving a trail of segments of ionizations corresponding to a few keV energy releases each. Their study leads to predict a keV energy threshold and 1-10 mm longitudinal and 0.1-0.3 mm transverse position resolution for nuclear recoils, very promising for the application of optically readout TPC to DM searches and SN measurements.
Keywords
Cite
@article{arxiv.2005.12272,
title = {Performance of an optically read out time projection chamber with ultra-relativistic electrons},
author = {V. C. Antochi and E. Baracchini and L. Benussi and S. Bianco and C. Capoccia and M. Caponero and G. Cavoto and A. Cortez and I. A. Costa and E. Di Marco and G. D'Imperio and G. Dho and F. Iacoangeli and G Maccarrone and M. Marafini and G. Mazzitelli and A. Messina and R. A. N'obrega and A. Orlandi and E. Paoletti and L. Passamonti and F. Petrucci and D. Piccolo and D. Pierluigi and D. Pinci and F. Renga and F. Rosatelli and A. Russo and G. Saviano and S Tomassini and C. Voena},
journal= {arXiv preprint arXiv:2005.12272},
year = {2021}
}