Darmstadt 2016 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 14: Instrumentation III
HK 14.8: Talk
Monday, March 14, 2016, 18:15–18:30, S1/01 A3
Simulation and Optimisation of a Position Sensitive Scintillation Detector with Wavelength Shifting Fibers for Thermal Neutrons — •Matthias Herzkamp1, Thomas Brückel2, Günter Kemmerling2, Achim Stahl3, and Stefan van Waasen1,4 — 1ZEA-2, Forschungszentrum Jülich, Deutschland — 2JCNS, Forschungszentrum Jülich, Deutschland — 3III. Physikalisches Institut B, RWTH Aachen, Deutschland — 4Faculty of Engineering, University of Duisburg-Essen, Deutschland
In neutron scattering experiments it is important to have position sensitive large scale detectors for thermal neutrons. A detector based on a neutron scintillator with wave length shifting fibers(WLSF) is a new kind of such a detector. We present the simulation of the detector in its entirety, taking into account the microscopic structure of the scintillation material as well as the WLSF attachment.
The scintillator consists of a converter and a scintillation powder bound in a matrix. In our case lithium-6 converts thermal neutrons into high energetic alpha and triton particles. The scintillation material is silver doped zinc sulfide. The WLSFs are positioned next to the scintillator plate in an orthogonal grid and are bent back at the edges to guide the light to PMTs. This arrangement drastically reduces the necessary number of light detection devices, which enables to build cost-efficient large-area detectors.
With our complete model of the detector it is possible to optimize its microscopic and macroscopic parameters with regard to detection efficiency and position sensitivity.