NIFS-390

FULL TEXT (PDF, 683 KB)


Author(s):

K.N. Sato, S. Murakami, N. Nakajima, K. Itoh

Title:

Possibility of Simulation Experiments for Fast Particle Physics in Large Helical Device (LHD)

Date of publication:

Dec. 1995

Key words:

Simulation experiment, Fast particle confinement, Alpha-particle physics, NBI, LHD(Large Helical Device)

Abstract:

The confinement of fusion-produced or high energy particles is one of the most important issues to be studied in the helical confinement system. A preliminary study has been carried out about the possibility of techniques for simulation experiments for the study of high energy particle physics in the Large Helical Device (LHD) project. Candidates of the methods have been considered as follows: (a) a high energy(~3.5 MeV) He^0 beam injection method, (b) a medium energy (~200 keV) H^0 beam injection method, (c) a method of high energy tail production by ICRF wave and/or a method of reaction rate enhancement by ICRF wave, (d) a method of the combination of neutral beam injection and ICRF wave, and so forth. Features of each method have been considered. Although the high energy He^0 beam injection method has a couple of advantages, the technique of production of this beam is extremely difficult because of the difficulties of both the production of negative helium and ground-state neutral-helium production by neutralization. It is pointed out on the other hand that wide range of simulation experiments for fast particle physics may be carried out even by the medium energy beam method, because the typical orbit deviation (e.g., equivalent super-banana size in a classical sense) can be largely controlled by controlling the magnetic field configuration in the case of helical system, for example by shifting the magnetic axis. This is one of the unique features of helical system in contrast to the axisymmetric system.

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