CRAB Neutron Time-of-Flight Measurements

These measurements aim at the spectral characterisation of the primary CRAB neutron beam located at the TRIGA Mark II research reactor of TU Wien. The measurements were performed with a Fermi Chopper running at 170 Hz, the chopper detector distance is 1 m. The chopper opens twice per rotation for neutron transmission, resulting in a repetition rate of 340 Hz and a frame period of 2.941 ms. Data files contain in the first 2 rows the start and stop time of the measurement, and the number of time frames associated with the measurement. There follow 2 data columns, the first being the time-of-flight in seconds, the second the neutron counts for the resepective time bin which extends from the time-of-flight in the very same row to the time-of-flight specified in the following row. The time spectra were recorded with a sampling rate of 1 MHz.