Speaker
Description
A report will be presented on the performance of Time Projection Chamber gas amplification elements that have been utilized and gases proposed for next generation central tracking detectors, including an option with continuous readout at high luminosity. The presentation will focus on issues critical for high rate detector operation, such as the positive ion backflow (IBF) and energy resolution of these structures. Different gas mixtures were studied for a 4-GEM TPC readout setup to select options with low transverse diffusion, high electron drift speed and acceptable IBF. We have proposed, simulated, and measured the properties of a combination of a MicroMeGas (MMG) detector with two Gas Electron Multipliers (GEM) for high rate TPC applications. HV supply reactions to sparks for the MMG setup with/without a resistive layer for protection were studied with the TPC application in mind.
