《Table 1 Main parameters of the simulation model in musrSim》

《Table 1 Main parameters of the simulation model in musrSim》   提示:宽带有限、当前游客访问压缩模式
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《Conceptual design and update of the 128-channel μSR prototype spectrometer based on musrSim》


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Figure 1 shows the schematics of the l SR prototype spectrometer built in musrSim.In the upper part of Fig.1,the two-ring structure comprises two detector rings with 64detectors per ring,degraders,a cryostat,and a beam pipe.The new four-ring structure(bottom)changed the cryostat to a close cycle refrigeration(CCR)system with cruciform similar to that of the European Muon(EMU)spectrometer[19].The four-ring spectrometer has 32 detectors per ring,resulting in a reduction in the radius of the detector ring from 150 to 90 mm.The arrangement of detectors in this four-ring structure is similar to that of the EMU spectrometer.Table 1 presents the main parameters of these two models.The optimal size of the degraders is described in Sect.3.Note that the detector ring near the sample is assigned as the inner ring.Five million muons were simulated in each run to obtain good statistical precision.The sample size used in the ISIS muon facility generally ranges from 10 to 50 mm(in both horizontal and vertical directions).Therefore,we set the size of the sample to U30 mm.The parameters of the EMuS beam are listed in Table 1.The size of the muon beam spot on the sample is optimized to 30 9 30 mm2in full width at half maximum(FWHM)accordingly.A small beam spot can be achieved by modifying slit settings if required in a specific experiment.