Speaker
Description
POLANO is the chopper type spectrometer with a polarization analysis capability in the Materials and Life Science Experimental Facility (MLF), J-PARC. After several years spent for designing, manufacturing and construction of the spectrometer, it is commenced the beam commissioning and a part of user program with unpolarized neutron beam condition. Intensity, divergence, TOF beam profile measurements and direct imaging of the neutron beam were performed. Since POLANO is targeting high-energy polarization experiment, all its components are designed as optimizing for 100 meV of neutron energy. In particular, 4 $Q_{c}$ converging super mirror guide tube can effectively transport such a relatively high energy neutron to the sample position. Also, we are making our efforts to eliminate unintended contaminations. POLANO principal concept is to achieve higher-energy polarization analysis of inelastic scattering beyond a reactor-based neutron source. We target the transfer energy range over DE = 40 meV with using in situ SEOP (Spin Exchange Optical Pumping) for a polarizer and bender supermirror as an analyzer (phase I). We have now successfully set up all of the polarization components polarizer and analyzer system as well as magnetic systems. We could get reasonable results on, 1) 80% $^{3}$He spin polarization of the SEOP polarizer with 20 hours ramping up time, 2) good control of spin flipping at SEOP, 3) non-adiabatic magnetic continuities along entire neutron path, and 4) neutron spin analyze by bending super mirror analyzer system. The clear differences of neutron profile could be observed between spin-flip and non-spin-flip channel. In this presentation, the recent progress of POLANO instrumentation and on-going commissioning results of polarization analysis will be reported.