20-25 October 2019
PSI
Europe/Zurich timezone

GADGET: a novel ultra-cold neutron gaseous detector for the n2EDM project

22 Oct 2019, 17:00
1m
WHGA/001 - Auditorium (PSI)

WHGA/001 - Auditorium

PSI

Speakers

Mr Jianqi Chen (Laboratoire de physique corpusculaire, Caen, France)Mr William Saenz (Laboratoire de physique corpusculaire, Caen, France)

Description

A new ultra-cold neutron (UCN) detector is required for the n2EDM experiment since the previous $^6$Li-doped glass scintillator (NANOSC) model, used in the nEDM experiment, is constrained by its small size and high price (\textcolor{red}. Hence, the authors propose a novel detector (GADGET) composed of a chamber filled with $^3$He and CF$_4$ gases, and three perpendicular photo-multiplier tubes coupled to it. In order to access the optimal gas pressures, two experiments, one at the Paul Scherrer Institute with a pulsed UCN beam, and the other at the Mainz's TRIGA reactor with constant UCN flux, were carried out. As a result, under conditions of 400 mbar for CF$_4$ and 25 mbar for $^3$He, a relatively higher detection efficiency (twice the one of a Cascade detector) and a great background suppression (estimated in a 2\% of the total counts at PSI) were achieved. In addition, to further improve the light emission properties of GADGET, tests with new customized photo-multiplier tubes, thinner entrance foils and higher transmittance chamber windows are also discussed.

Primary authors

Mr Gilles Ban ({Laboratoire de physique corpusculaire, Caen, France) Mr Jianqi Chen (Laboratoire de physique corpusculaire, Caen, France) Mr Pierrick Flaux (Laboratoire de physique corpusculaire, Caen, France) Mr Damien Goupilli\'ere (Laboratoire de physique corpusculaire, Caen, France) Mr Thomas Lefort (Laboratoire de physique corpusculaire, Caen, France) Mr Yves Lemi\'ere (Laboratoire de physique corpusculaire, Caen, France) Mr William Saenz (Laboratoire de physique corpusculaire, Caen, France)

Presentation Materials