Münster 2017 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 27: Poster

HK 27.81: Poster

Dienstag, 28. März 2017, 16:45–18:45, F Foyer

An electroluminescence tracking TPC for high rates — •Markus Ball, Bernhard Ketzer, and Konstantin Muenning — Helmholtz Institut für Strahlen und Kerphysik, Universität Bonn

We will discuss a novel method to amplify primary charges for a tracking Time Projection Chamber (TPC) in high energy physics (HEP). The goal is to develop an ion backflow-less TPC detector to overcome the major drawback of this detector type for future HEP applications. Back drifting ions are inhomogeneous space charges that can distort the‘next incoming electron clouds. With the purpose of performing high-resolution spectrometry of low energy X-rays, detector designs exploiting electroluminescence in noble gases were developed in Coimbra and CERN. Here the primary charges are not amplified by ionising, but exciting the gas atoms. This forms dimers between the noble gas atoms. When the dimers decay they emit photons with a gas specific wavelength, which is typically in the deep uv region.
We want to adapt this concept for for high rate tracking TPCs. This requires to add an quencher to the noble gas that on the one hand reduces the light yield, but on the other hand increases to drift velocity of the electrons in the gas to typical values for tracking TPCs. We have designed a demonstrator detector and a gas system to measure the reduction of light yield as a function of the amounts of quencher. The drift velocity can be calculated using the software package Garfield+. A list of suitable gas mixtures that will be evaluated with the prototype, as well as, first results will be presented.