Initial operation results of NE213 scintillation detector for time-resolved measurements on triton burnup in KSTAR.

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ID: 97188
2018
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Abstract
In time-resolved measurement for triton burnup in Korea Superconducting Tokamak Advanced Research (KSTAR) deuterium plasmas, an NE213 liquid scintillation detector was installed and operated during the 2017 KSTAR campaign. The detector is composed of an NE213 scintillator (50 mm in diameter and 10 mm in thickness) and a photomultiplier tube (PMT). The PMT anode signal was processed under a data acquisition system which contains a field programmable gate array circuit and pulse processing software that is capable of discriminating gamma-ray and neutron pulse signals. In order to determine an appropriate threshold level for the 14 MeV neutron signal resulting from triton burnup, the NE213 scintillation detector was calibrated by using d-d and d-t neutron generators at the National Fusion Research Institute and Intense 14 MeV Neutron Source Facility, OKTAVIAN, Osaka University, Japan. The detector was installed on KSTAR with a 10 mm thick soft-iron stray magnetic field shield and a radiation shield which consists of 100 mm thick lead blocks and 200 mm thick borated polyethylene blocks. A discrimination range for d-t neutron was determined based on test results from neutron generators and KSTAR. Data points selected from the discrimination range were consistent with the classical triton confinement characteristics. In conclusion, under condition of an input counting rate of 1.9 × 10 counts per second (CPS), the detector is able to measure triton burnup signals up to 500 CPS for various plasma parameters.
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Authors Jo, Jungmin;Cheon, MunSeong;Kim, Junghee;Lim, Soobin;Isobe, M;Ogawa, K;Nishitani, T;Park, Seugil;Murata, I;Chung, Kyoung-Jae;Hwang, Y S;
Journal The Review of scientific instruments
Year 2018
DOI
10.1063/1.5039308
URL
Keywords
cosmic rays cosmogenic neutrons geomagnetic pole neutron detectors secondary cosmic rays

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