@article{oai:niigata-u.repo.nii.ac.jp:00002595,
 author = {Kohagura, J. and Cho, T. and Hirata, M. and Watanabe, H. and Minami, R. and Numakura, T. and Yoshida, M. and Ito, H. and Tatematsu, Y. and Yatsu, K. and Miyoshi, S. and Ogura, K. and Kondoh, T. and Nishitani, T. and Kwon, M. and England, A.C.},
 issue = {3},
 journal = {Review of Scientific Instruments, Review of Scientific Instruments},
 month = {Mar},
 note = {Under the international fusion cooperating research, ³He neutron detectors in the GAMMA 10 tandem mirror are calibrated by the use of a [sup 252]Cf spontaneous fission neutron source (8.96 × 10[sup 4]n/s). The calibration experiments are carried out with a "rail system" placed along the magnetic axis of the GAMMA 10 central-cell region, where hot ions in the plasma experiments with the bulk temperatures of ∼10 keV are produced. As compared to a previous neutron monitoring system with a BF[sub 3] detector in GAMMA 10, the present ³He systems are designed with about two orders-of-magnitude higher neutron-counting efficiency for analyzing a neutron emissivity from the plasmas in a single plasma discharge alone. Two ³He systems are installed near the middle and the end of the central cell so as to identify the central-cell hot-ion axial profile. The filling pressure of ³He, the effective length, and the diameter of the detector are designed as 5 bar, 300 mm, and 50 mm, respectively. The detector output spectra are carefully analyzed by the use of a preamplifier, a shaping amplifier, as well as a multichannel analyzer for each ³He detector. In the present article, the neutron-counting data from the two ³He detectors due to the on-axis [sup 252]Cf scan are interpreted in terms of the d[sup -2] intensity dependence (d being the distance between the detector and the neutron source) as well as the effects of the central-cell magnetic coils and the other machine structural components.},
 pages = {1757--1760},
 title = {Calibration experiments of [sup 3]He neutron detectors for analyzing neutron emissivity in the hot-ion mode on the GAMMA 10 tandem mirror.},
 volume = {74},
 year = {2003}
}