Design and test of μSR detection system of EMuS at CSNS

Ni, Xiaojie; Pan, Ziwen; Deng, F. S.; Zhuang, M.Q.; Pooley, Daniel E.; Zhang, Y.G.; Dong, J.; Liang, H.; Tang, Jingyu; Cottrell, Stephen P.; Ye, B.J.

doi:10.1088/1748-0221/14/04/t04004

Cited by 5 publications

(4 citation statements)

References 17 publications

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“…In this work, A 0 is chosen to be 0.25. The pulse height spectrum of the Chinese detector was measured on ISIS EMU [11,13] beamline as shown in figure 2 The time of stop signals can be stamped using a leading-edge discrimination (LED) method or a constant fraction discrimination (CFD) method. For the CFD method, the input signal is fed into two channels.…”

Section: Methods Descriptionmentioning

confidence: 99%

Research of influential factors on pulsed μSR spectra using Monte Carlo simulations

et al. 2019

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The quality of pulsed μSR spectra are affected by several factors, namely beam time structure, the time width of detector signals, signal processing methods. A Monte Carlo simulation code—“MuSS” (Musr Signal Simulation) has been developed to investigate the influences of all these factors. Simulations show that both beam time width and external transverse field decrease the observable asymmetry. The asymmetry reduces quickly with larger beam time width under strong filed (> 100 Gauss). The deadtime calculated by leading-edge or constant fraction discrimination method shows no big differences. Bias voltage setup in the constant fraction discriminator should be small (in the range (−10, 10) mV). A figure of merit is used to quantify the maximum tolerable event rate of μSR detectors. Using a proper pole-zero circuit, the deadtime of the Chinese μSR detector can be reduced from ∼ 14 to ∼ 7 ns. Therefore the maximum tolerable event rate can be increased from 8 to 12 events/frame/detector.

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Section: Methods Descriptionmentioning

confidence: 99%

Research of influential factors on pulsed μSR spectra using Monte Carlo simulations

et al. 2019

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“…In China, there has been no experience in designing and constructing μSR spectrometers, though many laboratories have experiences in building similar array-type particle detection systems. The prototype consists of 128 detector units, readout electronics, a sample chamber, and a Helmholtz coil, [19,[21][22][23] see Figure 11. The detectors each with a plastic scintillator and a photomultiplier tube (PMT) are arranged in four rings, which is similar to the day-one μSR spectrometer but with half detector units.…”

Section: Randd Progressesmentioning

confidence: 99%

EMuS – A Pulsed Muon Facility for Multidisciplinary Research

Tang

Yuan

et al. 2022

Physica Status Solidi (a)

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A pulsed muon facility (the so‐called EMuS) at the China Spallation Neutron Source (CSNS) has been studied since 2007. It aims for multidisciplinary applications but with a focus on those based on muon spin rotation/relaxation/resonance techniques. As a standalone facility, EMuS will take about 5% or 25 kW of the total beam power (500 kW) from the CSNS‐II accelerator complex. Two schemes have been designed: the baseline scheme is based on an inner conical target in graphite and superconducting solenoids for the capture and transport of pions and muons; the simplified scheme is based on a conventional thick target and room‐temperature magnets for transport. With the former, multiple kinds of muon beams can be provided, from surface muons, decay muons, negative muons, to low‐energy muons. Mainly surface muons are available with the simplified scheme. With a number of novel design concepts such as forward capture of pions/muons from a target station based on superconducting solenoids and triple spatial beam splitting of a muon beam, the design aspects of EMuS are presented here. The wide application potential and the R&D progress are also included.

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“…About 5% of the proton beam power (500 kW, 1.6 GeV, 25 Hz) will be assigned to EMuS. The 𝜇SR spectrometer is under design [9][10][11]. In…”

Section: Introductionmentioning

confidence: 99%

Optimization of detector placements in reduction of multiple counts for μSR measurements at China Spallation Neutron Source

et al. 2022

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An Experimental Muon Source (EMuS) has been proposed to conduct muon spin rotation/relaxation/resonance (μSR) measurements at China Spallation Neutron Source (CSNS). To make better use of muons in each pulse, a highly segmented μSR spectrometer with more than 2000 detector channels is under design. Due to such high granularity of detectors, multiple counting events generated from particle scattering or spiral motion of positrons in a strong longitudinal field should be carefully considered in the design. According to the simulation, long scintillators have a good capability of angular discrimination. Detectors with cuboid geometries are better than those with frustum shapes. The cuboid detector with a length of 50 mm is longer enough to get the optimal range of discrimination angle. In a real μSR spectrometer, detectors can be placed parallelly along the beam direction or pointing to the sample. A figure of merit (FoM) has been proposed to compare such two arrangements by integrating their impacts on multiple counts and total counting loss in zero and longitudinal fields. The outstanding performance of multiple counting rejection due to the angular discrimination capability makes the pointing arrangement achieve much higher FoM. The simulation results can provide good support for the design of the highly segmented μSR spectrometer.

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Design and test of μSR detection system of EMuS at CSNS

Cited by 5 publications

References 17 publications

Research of influential factors on pulsed μSR spectra using Monte Carlo simulations

Research of influential factors on pulsed μSR spectra using Monte Carlo simulations

EMuS – A Pulsed Muon Facility for Multidisciplinary Research

Optimization of detector placements in reduction of multiple counts for μSR measurements at China Spallation Neutron Source

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