New method for studying the vacuum magnetic configuration in a stellarator

Journal Article · Tue Mar 01 04:00:00 EST 1988 · Sov. J. Plasma Phys. (Engl. Transl.); (United States)

OSTI ID:7062417

Dikii, A G; Zalkind, V M; Lesnyakov, G G; Pavlichenko, O S; Pashchenko, A V; Pashnev, V K; Pogozhev, D P; Tonkopryad, V M

A steady-state source of electrons in a stellarator magnetic field reacts to a change in the electron confinement as the source moves away from the boundary of the region with closed magnetic surfaces toward the magnetic axis. A method for stydying the vacuum magnetic configuration in stellarators can thus be based on simple measurements of the current drawn from a source of electrons moving in the stellarator by the vacuum chamber or by an additional transparent conducting grid spanning the magnetic-confinement region. The characteristics of a ''stellarator diode'' and of a ''stellarator diode with an auxiliary grid anode'' in the case of a moving point cathode have been studied. A procedure for studying the magnetic surfaces in some fusion devices, the Uragan-2 stellarator and the Uragan-3 torsatron, has also been studied. The method proposed in this paper for studying the magnetic surfaces in a stellarator does not require searching for the wake of an electron bunch, as is required in, for example, techniques involving a pulsed electron beam. The measurement time is accordingly shorter by more than an order of magnitude. This method has been used at the Uragan-3 torsatron to optimize the magnetic configuration by varying the transverse magnetic field of the torsatron.

• Research Organization: Physicotechnical Institute, Khar'kov
• OSTI ID: 7062417
• Journal Information: Sov. J. Plasma Phys. (Engl. Transl.); (United States), Journal Name: Sov. J. Plasma Phys. (Engl. Transl.); (United States) Vol. 14:3; ISSN SJPPD
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700102* -- Fusion Energy-- Plasma Research-- Diagnostics
ANNULAR SPACE
BEAMS
CATHODES
CLOSED PLASMA DEVICES
CONFIGURATION
ELECTRODES
ELECTRON BEAMS
LEPTON BEAMS
MAGNETIC FIELD CONFIGURATIONS
MAGNETIC SURFACES
PARTICLE BEAMS
ROTATIONAL TRANSFORM
SPACE
STELLARATORS
THERMONUCLEAR DEVICES
TOROIDAL CONFIGURATION
URAGAN STELLARATOR