Dortmund 2021 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 3: Accelerator neutrino experiments

T 3.1: Vortrag

Montag, 15. März 2021, 16:00–16:15, Tc

Hydrogen-rich Gases for High Pressure Time Projection Chambers at Neutrino Beamlines — •Philip Hamacher-Baumann, Nick Thamm, Thomas Radermacher, and Stefan Roth — RWTH Aachen University - Physics Institute III B, Aachen, Germany

DUNE's near detector complex foresees a magnetized high-pressure gaseous time projection chamber (HPgTPC) as part of its detector suite. The gaseous active volume results in a very low detection threshold with high particle-identification power and large acceptance for tracking, especially for interactions on the gas itself. Neutrino interactions on hydrogen nuclei in the drift gas can be extracted with the transverse kinematic imbalance method to produce intra-nucleon-interaction-free neutrino samples. For design and development of a pressurized TPC, it is essential to quantify and validate electron swarm parameters, such as drift velocity or diffusion, to ensure performance at large detector scales. In this presentation, I will discuss how electron swarm parameters of drift gas mixtures perform at higher than atmospheric pressures. Additionally, a study of a choice of hydrogen-rich gas mixtures for consideration in HPgTPC is presented in addition to measurements in a test chamber. The results are assessed with respect to performance at 10 bar pressure in HPgTPC.