Abstract
The behavior of the 1 MeV triton has been studied in order to understand the alpha particle confinement property in the deuterium operation of toroidal fusion devices. To obtain time evolution of the deuterium-tritium (D-T) neutron emission rate where the secondary DT neutron emission rate is approximately 1012 n/s, we designed two high detection efficiency scintillating fiber (Sci-Fi) detectors: a 1 mm-diameter scintillation fiber-based detector Sci-Fi1 and a 2 mm-diameter scintillation fiber-based detector Sci-Fi2. The test in an accelerator-based neutron generator was performed. The result shows that the directionality of each detector is 15° and 25°, respectively. It is found that detection efficiency for DT neutrons is around 0.23 counts/n cm2 for the Sci-Fi1 detector and is around 1.0 counts/n cm2 for the Sci-Fi2 detector.
Highlights
In deuterium operation of toroidal fusion devices, the behavior of 1 MeV triton created by d(d,p)t reaction has been studied in order to understand alpha particle confinement property because kinetic parameters of 1 MeV
Timeresolved triton burnup study has been performed by measuring secondary DT neutron created by t(d,n)α using scintillating fiber (Sci-Fi) detector in large tokamaks2-4 and helical systems5 with the typical deuterium-deuterium (DD)
To obtain time evolution of secondary DT neutron emission rate where the DT neutron emission rate is around n/s, we designed high detection efficiency scintillating fiber detectors based on scintillating fibers embedded in the aluminum substrate
Summary
In deuterium operation of toroidal fusion devices, the behavior of 1 MeV triton created by d(d,p)t reaction has been studied in order to understand alpha particle confinement property because kinetic parameters of 1 MeV triton such as Larmor radius and precession frequency are similar to those of DT born alpha particles. Timeresolved triton burnup study has been performed by measuring secondary DT neutron created by t(d,n)α using scintillating fiber (Sci-Fi) detector in large tokamaks and helical systems with the typical deuterium-deuterium (DD). Neutron emission rate (Sn) of 1015 n/s to 1016 n/s In these experiments, the triton burnup ratio in these machines is up to 1 %, the 14 MeV neutron emission rate (SnDT). The time-integrated triton burnup ratio was successfully measured by activation foil technique , and it is reported that SnDT is 1011 - 1012 n/s in KSTAR6.
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