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

Journal Article · Sun May 01 04:00:00 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), Journal Name: Physics of Plasmas; (United States) Vol. 1:5; ISSN PHPAEN; ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

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