May 24 – 28, 2021
America/Vancouver timezone

Options for gain elements and gas mixtures in a high rate EIC Time Projection Chamber

May 25, 2021, 5:00 AM
30m
Poster Sensors: Gaseous Detectors Sensor Posters: Gaseous Detectors

Speaker

Nik Smirnov (Yale University (US))

Description

  In order to investigate options for a future high rate TPC we have tested various gas gain structures and gas mixtures. Our goal was to focus on crucial TPC parameters: ion back flow, energy resolution (dE/dx), electron and ion drift speed, electron diffusion (in E- and B-fields), and stability. We concentrated on two options for the gain structure: 4 GEMs and MMG+2GEMs. We investigated a potential instability (MMGs) that occurs primarily from a high voltage (HV) power supply (PS) voltage drop in reaction to a discharge. It was demonstrated that a resistive protection layer on a readout structure reduces the HV PS voltage drop after a spark to practically negligible levels. The hybrid micro-pattern gas amplification stage allows for a TPC design that can operate in a continuous mode, serves as an option to limit space charge distortions in high-rate TPCs, and guarantees that dE/dx, space reconstruction resolution, drift parameters and detector stability will not be compromised.

Primary authors

Nik Smirnov (Yale University (US)) Dr Craig Woody (BNL) Prof. John Harris (Yale University) Mrs Caitlin Beattie (Yale University)

Presentation materials