EMuS – A Pulsed Muon Facility for Multidisciplinary Research

Abstract

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.

Investigation of the muonic atoms distribution in materials through muonic x-rays momentum simulation using Geant4

“…However, in these experiments, only one pinhole was employed for x-ray collimation, resulting in a relatively low detection efficiency. By contrast, researchers at the University of Science and Technology of China developed a coded aperture imaging technique for μ-X ray imaging, which significantly improved the detection efficiency and slightly improved the imaging quality [17].The first Experimental Muon Source (EMuS) in China is now under construction at the Chinese Spallation Neutron Source (CSNS), which also includes a negative muon beam for elemental analysis and μ-X ray imaging [18]. However, these aforementioned studies are all based on the principle of small-aperture imaging, which shields a large number of rays resulting in low detection efficiency.…”