Detection of fusion neutrons from a deuterium-proton mixed plasma in the GAMMA10 Tandem Mirror
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibakaki-ken 305 (Japan)
Neutron diagnostics are applied to a deuterium plasma mixed with protons in the central cell of the GAMMA10 tandem mirror [Inutake {ital et} {ital al}., Phys. Rev. Lett. {bold 55}, 939 (1985)]. The deuterium ions are heated with a slow ion cyclotron wave tuned to the fundamental deuterium resonance near the mid-plane of the central cell while the plasma is sustained with the fundamental resonance heating of protons in the minimum-B anchor cells. The measurement is based on {ital in} {ital situ} calibration to determine the transmission efficiency through machine walls and the counting efficiency of the detection system for neutrons emitted from {sup 252}Cf with energy close to that in the deuterium{endash}deuterium (D{endash}D) fusion reaction. The observation shows that the count rate of neutrons increases with diamagnetism, and this relation is accounted for in terms of fusion reaction between deuterium ions with a transverse temperature exceeding 10 keV. Discrepancies among ion temperatures determined with different diagnostics are mostly attributed to insufficient knowledge of the profiles of plasma parameters. The results indicate that the neutron measurement can be added as a powerful diagnostic tool for hot ions if combined with more detailed profile measurements. {copyright} {ital 1996 American Institute of Physics.}
- OSTI ID:
- 278490
- Journal Information:
- Physics of Plasmas, Vol. 3, Issue 2; Other Information: PBD: Feb 1996
- Country of Publication:
- United States
- Language:
- English
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