Experimental study of curvature-driven flute instability in the gas-dynamic trap

Journal Article · Sun May 01 00:00:00 EDT 1994 · Physics of Plasmas; (United States)

DOI:https://doi.org/10.1063/1.870704· OSTI ID:6692691

Ivanov, A A; Anikeev, A V; Bagryansky, P A; Bocharov, V N; Deichuli, P P; Karpushov, A N; Maximov, V V; Pod'minogin, A A; Rogozin, A I; Salikova, T V; Tsidulko, Y A ^[1]

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1. The Budker Institute of Nuclear Physics, Novosibirsk 630090 (Russian Federation)

A curvature-driven flute instability will be excited in the magnetized plasmas if the magnetic field lines curve toward the entire plasma boundary. Conditions under which it can be effectively stabilized in axisymmetric geometry have been experimentally studied in a gas-dynamic trap (GDT) at Novosibirsk. Flexible design of the experimental device and the availability of neutral beams and ion cyclotron heating enabled the pressure-weighted curvature to be varied over a wide range. The stability limits were thus measured and compared with those predicted by the modified Rosenbluth--Longmire criterion. Characteristics of unstable curvature-driven flute modes were also measured and found to conform to a theory including finite ion Larmor radius (FLR) effects. Stable operation during neutral beam injection was achieved with a cusp end cell, resulting in an increase in [ital T][sub [ital e]] to 45 eV, limited by end losses rather than anomalous power losses.

• OSTI ID: 6692691
• Journal Information: Physics of Plasmas; (United States), Vol. 1:5; ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
FLUTE INSTABILITY
MAGNETOHYDRODYNAMICS
FLUCTUATIONS
ION CYCLOTRON-RESONANCE
LARMOR RADIUS
MAGNETIC FIELD CONFIGURATIONS
MIRRORS
NEUTRAL ATOM BEAM INJECTION
TRAPS
BEAM INJECTION
CYCLOTRON RESONANCE
FLUID MECHANICS
HYDRODYNAMICS
INSTABILITY
MECHANICS
PLASMA INSTABILITY
PLASMA MACROINSTABILITIES
RESONANCE
VARIATIONS
700340* - Plasma Waves
Oscillations
& Instabilities- (1992-)