Wuppertal 2015 – scientific programme

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T: Fachverband Teilchenphysik

T 29: TPC und Micromegas

T 29.1: Talk

Monday, March 9, 2015, 16:45–17:00, I.12.02 (HS 31)

A pixel TPC for the Linear Collider: A Testbeam with the demonstrator — •Michael Lupberger for the LCTPC-Deutschland collaboration — Universität Bonn

A Time Projection Chamber (TPC) is foreseen as tracker for the ILD, one of the two detector concepts at the planned International Linear Collider (ILC). At the TPC endplates, Micromegas or GEMs will be used as gas amplification structure.

Besides segmented anodes, also an active endplate with pixel ASICs is considered as a readout option. We use the Timepix chip as readout ASIC in our experiments. In a photolithographic process a grid has been produced on top of the chip to form a so called InGrid, which is a Micromegas-like detector.

An endplate module with an array of eight InGrids has been tested as readout of a prototype time projection chamber at DESY in March 2013. Meanwhile, a complete module has been equipped with 96 InGrid chips. 50% of the module surface is covered with pixels, resulting in 6.2 million readout channels. For that reason, the readout system was largely extended, also using the scalability that it provides.

This final design of the module and readout system, including data transfer and concentration, cooling, low and high voltage distribution will be tested in another testbeam campaign at the beginning of 2015. Design choices, implementations and impressions from the construction and commissioning phase will be presented. Possibly, preliminary results from the test beam will be shown.