Wide dynamic range neutron flux monitor having fast time response for the Large Helical Device.

A fast time response, wide dynamic range neutron flux monitor has been developed toward the LHD deuterium operation by using leading-edge signal processing technologies providing maximum counting rate up to similar to 5 x 10(9) counts/s. Because a maximum total neutron emission rate over 1 x 10(16) n/s is predicted in neutral beam-heated LHD plasmas, fast response and wide dynamic range capabilities of the system are essential. Preliminary tests have demonstrated successful performance as a wide dynamic range monitor along the design. (C) 2014 AIP Publishing LLC.