Development of General Purpose μSR Spectrometer ARTEMIS at S1 Experimental Area, MLF J-PARC

Abstract

We have developed a general purpose µSR spectrometer ARTEMIS and installed at S1 experimental area of MLF, J-PARC. The new spectrometer has the identical design with the D1-spectrometer developed in 2013; the common design of the two general purposes spectrometers helps sharing the sample environment apparatus and direct comparison of the beam characteristics between the two experimental areas. We have upgraded the front-end circuit of positron/electron detectors, and achieved high enough hit rate tolerance for muon beam available in the future 1 MW operation of MLF. Other revisions and modifications, which became necessary after the commissioning and the actual usage of the S1/D1 spectrometers have been applied to both of the twin spectrometers.

Na-ion dynamics in the solid solution NaxCa1−xCr2O4 studied by muon spin rotation and neutron diffraction

“…The m + SR spectra were acquired at the muon spectrometers EMU 27 and RIKEN-RAL, 28 at the ISIS Neutron and Muon source 29 (United Kindom), and S1 (ref. 30) at the J-PARC research facility 31 (Japan). For the muon measurements, ∼1.5 g of sample in powder form were pressed into a pellet under a pressure of about 1.9 tons.…”

Current Status of Muon Science Facility

“…The spectrometer in S1 area is named ARTEMIS [17] which contains 40 Kalliope units that cover 21.2% of the total solid angle for positron/electron detection. One Kalliope detector unit consists of 32 channels of individual positron detectors.…”