Abstract
The R&D activities for the linear collider TPC (LC-TPC) are currently working on the adoption of the micro pattern devices for the gaseous amplification stage. Several beam tests have been carried out at DESY with a 5 GeV electron beam in a 1 T superconducting magnet. We worked on a large prototype TPC with an end-plate that was built, for the first time, using seven resistive bulk Micromegas modules. During experiments, reduced signal sensitivity was observed at the boundary of these modules. Electrostatic field distortion near the module boundaries was considered to be the possible major reason behind these observations. In the present work, we will explore this hypothesis through numerical simulation. Our aim has been to understand the origin of distortions observed close to the edges of the test beam modules and to explore the possibility of using the Garfield simulation framework for investigating a phenomenon as complex as distortion.
Highlights
A Time Projection Chamber (TPC) [1] is envisaged just beyond the vertex detector of the proposed linear collider [2]
Since 2008, the linear collider TPC (LC-TPC) collaboration has been involved in the design, development and test of a Large Prototype TPC (LP-TPC) with amplification systems based on different Micro-Pattern Gaseous Detectors (MPGDs) and corresponding read-out schema
Overall features of the electrostatic field, electron drift and diffusion are the same, no direct comparison can be made since the geometries of the modules and the approximations involved are of a different nature
Summary
A Time Projection Chamber (TPC) [1] is envisaged just beyond the vertex detector of the proposed linear collider [2]. For the 2013 February test beam run, Micromegas modules with resistive coating were chosen [7]. These modules have keystone shape (∼ 22 × 17 cm2), which is similar to the shape foreseen for the ILD-TPC. The reconstruction of a typical track on theTPC end-plate, consisting of seven modules, is shown in figure 1(a). Besides investigating the electric field at the module boundaries for an end-plate having Micromegas modules, we have numerically estimated the residuals for a relatively more realistic geometry and compared our estimates with the experimental data. Instead of a TPC field cage, a drift plane has been placed 1 cm above the modules. As shown in figure 3(a), have been considered
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