Development of L-Bent Positron Detectors for μSR Applications at China Spallation Neutron Source
- 26 July 2021
- journal article
- research article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Nuclear Science
- Vol. 68 (9), 2407-2413
- https://doi.org/10.1109/tns.2021.3099685
Abstract
A 128-channel positron detection system will be constructed at Experimental Muon Source (EMuS) of China Spallation Neutron Source (CSNS) to conduct muon spin rotation/relaxation/resonance ( μSR) measurements. Each detector channel consists of a scintillator, a light guide, and a photomultiplier tube (PMT). The long light guide is bent to an “L” shape to propagate optical photons from the scintillator to the PMT. A series of Geant4 simulations and experiments has been performed to optimize the light collection performance of the L-bent detector. Geometry deformation induced by the bending process has been well modeled. Simulation results agree with the experimental tests. Accordingly, a novel hybrid wrapping method (scintillator with polytetrafluoroethylene (PTFE) and light guide with aluminum tape) has been developed to improve the amplitude of detector signals greatly. Compared to wrapping the detector with merely PTFE tapes or aluminum tapes, this method leads to an enhancement in light collection efficiency of 73% or 14%, respectively. Two optimally manufactured prototype detectors using the novel wrapping method have been tested at the ISIS Muon Facility. The beam tests demonstrated that the L-bent detectors can precisely measure the behavior of muon spins inside samples. Therefore, the L-bent detector design is competent for μSR applications at CSNS/EMuS.Keywords
Funding Information
- National Natural Science Foundation of China (12005221, 11527811)
- State Key Laboratory of Particle Detection and Electronics, University of Science and Technology of China (SKLPDE-ZZ-202018)
This publication has 20 references indexed in Scilit:
- NewμSR spectrometer at J-PARC MUSE based onKalliopedetectorsJournal of Physics: Conference Series, 2014
- Optimising a muon spectrometer for measurements at the ISIS pulsed muon sourceNuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2014
- Nonunitary Triplet Pairing in the Centrosymmetric SuperconductorPhysical Review Letters, 2012
- High-Field μSR Instrument at PSI: Detector SolutionsPhysics Procedia, 2012
- Design and commissioning of a high magnetic field muon spin relaxation spectrometer at the ISIS pulsed neutron and muon sourceReview of Scientific Instruments, 2011
- Magnetic and non-magnetic phases of a quantum spin liquidNature, 2011
- Progress in development of newμSR spectrometer at RIKEN-RALJournal of Physics: Conference Series, 2010
- A new detector system for the ALC spectrometer—First experience with G-APDs in instrumentationPhysica B: Condensed Matter, 2009
- Spin-polarized muons in condensed matter physicsContemporary Physics, 1999
- The ISIS pulsed muon facilityThe European Physical Journal C, 1992