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DOI 10.5286/raltr.2015001
Persistent URL http://purl.org/net/epubs/work/12309309
Record Status Checked
Record Id 12309309
Title Monte Carlo simulations of the MuSR spectrometer at ISIS : current instrument and future designs
Abstract We have used the package musrSim (based on the Monte Carlo toolkit Geant4) to simulate the current MuSR instrument at ISIS and some potential future designs with highly segmented detectors, studying how their performance expressed as a figure of merit varies with changing positron degrader ring thickness, beam pipe design, and the presence or absence of a cryostat. The results were in very good agreement with previous experiments for the degrader ring and cryostat changes. The study has allowed us to optimise designs for the degrader rings and beam pipe on the current instrument, yielding a 48% improvement in the figure of merit in zero field and 29% in transverse field configurations. We went on to investigate highly segmented detector arrays of different geometries with a view to designing a new instrument capable of much higher counting rates. The cylindrical geometry was the most effective investigated and provides up to a factor-of-three improvement in the figure of merit. Combined with appropriately increased segmentation and increased available muon flux from an imminent beamline upgrade this could lead to a twenty-fold improvement in data collection rates.
Organisation ISIS , ISIS-MuSR , STFC
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Licence Information: Creative Commons Attribution 3.0 Unported (CC BY 3.0)
Language English (EN)
Type Details URI(s) Local file(s) Year
Report RAL Technical Reports RAL-TR-2015-001. 2015. RAL-TR-2015-001.pdf 2015