Combination of two Gas Electron Multipliers and a Micromegas as gain elements for a time projection chamber

Abstract

We measured the properties of a novel combination of two Gas Electron Multipliers with a Micromegas for use as amplification devices in high-rate gaseous time projection chambers. The goal of this design is to minimize the buildup of space charge in the drift volume of such detectors in order to eliminate the standard gating grid and its resultant dead time, while preserving good tracking and particle identification performance. We measured the positive ion back-flow and energy resolution at various element gains and electric fields, using a variety of gases, and additionally studied crosstalk effects and discharge rates. At a gain of 2000, this configuration achieves an ion back-flow below 0.4% and an energy resolution better than $\sigma /\text{E}=12\%$ for ${}^{55}$Fe X-rays.

22 Pages, 9 Figures. Submitted to Nuclear Instruments and Methods

References in corpus (2)

• Ion backflow in the Micromegas TPC for the future linear collider
• Simulations of a multi-layer extended gating grid

Cited by in corpus (8)

• Overview and Design of the sPHENIX TPC
• Particle identification studies with a full-size 4-GEM prototype for the ALICE TPC upgrade
• Studies on ion back-flow of Time Projection Chamber based on GEM and anode wire grid
• Reduction of ion back flow using a quadruple GEM detector with various gas mixtures
• Feasibility study of TPC tracker detector for the circular collider
• Discharge mitigation methods in MPGD-based detectors
• Study of a Passive Gating Grid for Ion Back Flow Suppression
• Measurement of the ion blocking by the passive bi-polar grid