Würzburg 2018 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

T: Fachverband Teilchenphysik

T 14: Gasgefüllte Detektoren I

T 14.1: Gruppenbericht

Montag, 19. März 2018, 16:00–16:20, Z6 - SR 2.002

High Resolution Neutron Detection — •Markus Köhli, Markus Gruber, Fabian Schmidt, Jochen Kaminski, and Klaus Desch — Physikalisches Institut, University of Bonn, Bonn, Germany

Over decades the quasi-standard for thermal neutron detection has been set by helium-3, which acts as a converter as well as counting gas. Fueled by the helium crisis and the demand of large scale research infrastructures like the European Spallation Source the run for substitutional technologies using boron layers started - most of them adopted from particle physics. The MediPix platform - CMOS based chips with 55 µ m sized pixels operated at clock speeds up to 80 MHz - has been successfully evaluated in various detectors. This contribution presents the technological capabilities of a highly granular CMOS readout for neutron detection and discusses the system developed in Bonn aiming to realize a neutron time projection chamber. In a detector with 8 TimePix chips equipped with InGrid meshes as a gas amplification stage, the track topology with this unrivaled high resolution has been studied. By reconstructing the origin of the conversion ions from a boron layer, arranged in parallel to the readout, a time resolution below 50 ns and a spatial resolution of 100 µ m has been achieved.