Recent Progress on DNA ToF Backscattering Spectrometer in MLF, J-PARC

DNA is a time-of-flight backscattering neutron spectrometer installed at the Materials and Life Science Experimental Facility in J-PARC. After opening user program, we have been developing upgrading DNA. The energy resolution improved achieved designed value of 1.4 μeV by renewing disks pulse shaping chopper that can rotate max 300 Hz instead 225 previous disks. installation Si311 analyser mirrors has almost accomplished, which extends momentum transfer region up to 3.7 Å -1 . We demonstrate effect this extension measuring analysing methyl rotation dynamics solid toluene 10 K 40 K. also report variety sample environment available their remote handling.