Göttingen 2025 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 71: Detectors VI (Gaseous Detectors)

T 71.7: Vortrag

Donnerstag, 3. April 2025, 17:45–18:00, VG 1.101

Negative Ion Gridpix based High resolution TPC (NIGHT) detector — •Saime Gürbüz, Thomas Block, Can Cihan Çetinkaya, Klaus Desch, Jan Glowacz, Jochen Kaminski, and Michael Vogt — Physikalisches Institut, Bonn, Germany

The Negative Ion Time Projection Chamber (NITPC) equipped with a Gridpix pixelated readout represents a cutting-edge approach to high-precision particle detection, with significant potential for directional dark matter searches. The proof-of-concept detector, NIGHT, combines a Timepix ASIC with an InGrid amplification stage, offering an active area of 1.4 cm × 1.4 cm and a drift length of 3 cm.

Operating with a He:SF₆ gas mixture, the detector profits the electronegative properties of SF₆ to achieve negative ion drift, reducing diffusion and enhancing spatial resolution. As the carrier gas, Helium supports near-atmospheric operation and optimal ion transport properties. The Gridpix readout, featuring micromesh amplification, ensures high spatial and temporal resolution even for low-energy particle tracking.

The NIGHT detector’s design, operational principles, and performance will be presented in this talk. Gain measurements are conducted with radioactive sources in the laboratory and further tested at the ELSA electron accelerator. These studies aim to validate the detector’s capabilities and demonstrate the advantages of pixelated readouts combined with negative ion drift for precision particle detection and directional dark matter experiments.

Keywords: Gridpix; Negative Ion Drift; Time Projection Chamber (TPC); Timepix