2025/01/10 by D. J. Fernández-Posada, D. González-Díaz, Fernández-Posada, D. J. +13
Engineering · Materials Science · #Advancements in Semiconductor Devices and Circuit Design #Electronic and Structural Properties of Oxides #FOS: Physical sciences #Instrumentation and Detectors (physics.ins-det) #Semiconductor materials and devices
paper · pdf · doi:10.48550/arxiv.2501.05791
openalex publication_date 2025/01/10 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Gaseous Optical Time Projection Chambers (OTPCs) aimed at Neutrino Physics and Rare Event Searches will likely exceed the tonne scale during the next decade. This will make their performance sensitive to gas contamination levels as low as 100 ppb, that is challenging at room temperature due to outgassing from structural materials. In this work we discuss gas distribution and impurity mitigation in a 5 m-length/5 m-diameter 10 bar TPC filled with Ar/CF4 admixed at 99/1 per volume (1.75 tonne), loaded with technical plastics in order to enhance light collection and readout. Different distributor topologies, outgassing and flow rates are discussed. Specifically, our work is aimed at illustrating the conceptual viability of the optical readout of ND-GAr's TPC (within the DUNE Near-Detector complex), in terms of material compatibility. For our proposal, with perforated distributors aligned with the electric field, and under realistic assumptions, the concentration of contaminants can be controlled within a week after chamber filling. In the case of N2, injection of fresh gas at %-level seems to represent the safest strategy to keep the concentration within operability limits.