Münster 2017 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 7: Instrumentation II

HK 7.3: Talk

Monday, March 27, 2017, 17:30–17:45, F 073

Neutron measurement with a GridPix — •Tim Wagner, Markus Köhli, Fabian Schmidt, Jochen Kaminski, and Klaus Desch — Physikalisches Institut, Universität Bonn, Nußallee 12, 53115 Bonn

As a result of the Helium-3 crisis the demand for neutron detectors with alternative neutron converters still increases. Thus new technologies using Boron-10 are highly asked for. In Bonn the development a novel neutron detector started which aims to push the limits of spatial resolution by at least one order of magnitude applying time resolved event reconstruction. Using enriched Boron Carbide in thin layers this model sets the focus on very high spatial resolution. The detector is operated like a Time Projection Chamber (TPC) with a Boron layer placed between the drift volume and a scintillator. As the neutron conversion in Boron-10 produces two charged particles emitted back-to-back the light generated by the scintillator is used as a trigger for the track in the detection gas. The TPC will be read out by an array of GridPix - CMOS ASICs with pixels of 55µm × 55µm and a micromegas gas amplification on top of the chip, which allows to precisely measure the ionization track to the single electron level.

As a first step a prototype using a board with eight GridPix detectors has been built. With this prototype the track of a converted neutron on a GridPix is studied. The setup of the detector and measurements done will be presented in this talk.