Darmstadt 2016 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 70: Instrumentation XX

HK 70.6: Talk

Friday, March 18, 2016, 15:30–15:45, S1/01 A3

The CASCADE Project - On the Phase Front of Neutron Detection — •Markus Köhli and Ulrich Schmidt — Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Germany

By alerts on the future Helium supply critical to perspectives of the European Spallation Source the run on substitutional technologies started. Most of the solutions could be adapted from developments of particle physics. We report on the CASCADE Project - a novel detection system, which has been developed for the purposes of neutron spin echo spectroscopy. It features 2D spatially resolved detection of thermal neutrons at high rates. The CASCADE detector is comprised of a stack of solid Boron-10 coated Gas Electron Multiplier (GEM) foils, which serve both as a neutron converter and as an amplifier for the primary ionization deposited in the standard Argon-CO2 counting gas environment. This multi-layer setup increases the detection efficiency of a single entity. For the application in MIEZE spin echo techniques, which use the coherence of a fast oscillating neutron interference pattern as an observable, the signal of the charge traversing the stack is detected to identify the very thin conversion layer of about 1 mum. This allows to precisely determine the time-of-flight. Here we literally sit on the phase front of neutron detection. The RESEDA and MIRA Spectrometers at the FRM II run such new generation systems. This talk will discuss the characteristics of the system, challenges and perspectives, explicitly on the basis of the CASCADE detector at RESEDA.