Dissipative trapped particle modes in tandem mirrors

Technical Report · Thu Nov 01 04:00:00 EST 1984

OSTI ID:6145119

Berk, H L; Rosenbluth, M N; Cohen, R H; Nevins, W M

Dissipative trapped particle modes are studied in tandem mirrors by including electron collisions and ion Landau damping. A variational approach is used to obtain a collisional response in terms of the collisionless result plus a collisional term. The collisional term is then self-consistently solved in all collision frequency regimes. One finds that when nu/..omega.. << 1, (nu identically equal electron collision frequency) and the dissipationless theory is stable through a positive (negative) charge uncovering mechanism, there are two stable waves with phase velocities in the ion (electron) diamagnetic direction. The higher frequency wave with ..omega.. approx. ..omega../sub i/*(..omega../sub e/*) is destabilized by ion (electron) dissipation while the lower frequency wave is destabilized by electron (ion) dissipation. At high collision frequency (nu > ..omega../sub e/*), the only unstable trapped particle wave has ..omega.. approx. ..omega../sub e/*, with electron collisions being destabilizing.

• Research Organization: Texas Univ., Austin (USA). Inst. for Fusion Studies
• DOE Contract Number: FG05-80ET53088
• OSTI ID: 6145119
• Report Number(s): DOE/ET/53088-160; IFSR-160; ON: DE85005555
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700107* -- Fusion Energy-- Plasma Research-- Instabilities
COLLISIONS
DAMPING
ELECTRON COLLISIONS
INSTABILITY
LANDAU DAMPING
MAGNETIC MIRRORS
OPEN PLASMA DEVICES
PLASMA INSTABILITY
PLASMA MACROINSTABILITIES
PLASMA WAVES
TANDEM MIRRORS
THERMONUCLEAR DEVICES
TRAPPED-PARTICLE INSTABILITY
VARIATIONAL METHODS