Numerical Study of Electrostatic Field Distortion on LPTPC End-Plates based on Bulk Micromegas Modules
School of Physical Science, National Institute of Science Education and Research, Jatni, Khurda, India 752050
2 Applied Nuclear Physics Division, Saha Institute of Nuclear Physics, 1/AF, Bidhannagar, Kolkata, India 700064
3 Retired Professor, Applied Nuclear Physics Division, Saha Institute of Nuclear Physics, 1/AF, Bidhannagar, Kolkata, India 700064
4 DSM/IRFU, CEA/Saclay, F-91191. Gif-sur-Yvette, CEDEX, France
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Published online: 21 February 2018
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.
© The Authors, published by EDP Sciences, 2018
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