Karlsruhe 2024 – scientific programme

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T: Fachverband Teilchenphysik

T 93: Detectors 9 (gas detectors)

T 93.6: Talk

Thursday, March 7, 2024, 17:15–17:30, Geb. 30.23: 2/17

Electron swarm parameter measurements at subatmospheric pressures — Stefan Roth, Keitlin Sejdarasi, David Smyczek, Jochen Steinmann, and •Nick Thamm — RWTH Aachen University - Physics Institute III B, Aachen, Germany

Tissue Equivalent Gas mixtures (TEGs) were created to mimic the interactions of ionizing particles in human tissue for precise dose measurements. Filling Time Projection Chambers (TPCs) with TEGs enables measurements which resolve the spacial development of particles passing through tissue. By lowering the operating pressure inside a TPC, it is possible to fine-tune these detectors towards improved track resolution for low energies. For the correct interpretation of the low-pressure TPC data, various electron swarm parameters need to be precisely determined at these low pressures. Existing drift parameter simulations can be verified by utilizing a specialized Gas Monitoring Chamber (GMC). In this talk the hardware modification of a GMC towards low pressure operation is addressed, the associated challenges are explained and first measurement results of TEGs are shown.

Keywords: Gas Monitoring Chamber; Time Projection Chamber; Electron swarm parameters