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T: Fachverband Teilchenphysik

T 95: Gaseous Detectors III

T 95.6: Vortrag

Freitag, 20. März 2026, 10:15–10:30, KH 01.014

A Time-Projection-Chamber for Neutron Science — •Thomas Block¹, Klaus Desch¹, Jochen Kaminski¹, Markus Köhli^2,3, Saime Gürbüz¹, Jan Glowacz¹, and Can Cetinkaya¹ — ¹Physikalisches Institut, Rheinische Friedrich-Wilhelms Universität Bonn — ²Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg — ³StyX Neutronica GmbH, Mannheim

Due to the increased price of helium-3, alternative approaches for detectors in neutron science are highly demanded. This work combines the concept of a time projection chamber (TPC) with a boron-coated scintillator and optical guides. The GridPix-based readout with high granularity and high time resolution makes it a suitable candidate for imaging instruments and mid-rate scattering experiments. The enriched boron absorbs incoming thermal neutrons and decays into an alpha particle and a lithium ion. One ion enters the drift volume of the TPC and creates a trace of electron-ion pairs, which subsequently is projected onto the readout. The other ion of the same decay, which is emitted in the opposite direction, creates photons in the scintillator layer, which is used to trigger the readout. The light is coupled via an optical guide to a FPGA-controlled silicon photomultiplier trigger board. This timing information is necessary to reconstruct the three-dimensional ionisation track and hence the point of neutron conversion. We present the detector concept, its current stage of development and first measurements.

Keywords: time projection chamber; GridPix; SiPM; scintillator; optical fibers