Configuration control, fluctuations, and transport in low-collisionality plasmas in the ATF Torsatron

Conference · Tue Jan 01 00:00:00 EST 1991

OSTI ID:5816794

Harris, J H; Murakami, M; Baylor, L R; Bell, J D; Bigelow, T S; Carreras, B A; Colchin, R J; Crume, Jr, E C; Dominguez, N; Dory, R A; Dunlap, J L; Dyer, G R; England, A C; Glowienka, J C; Hillis, D L; Hiroe, S; Howe, H C; Hutchinson, D P; Isler, R C; Jernigan, T C ; Langley, R A; Leboeuf, J N; Lee, D K; Lyon, J F; Ma, C H; Rasmussen, D A; Simpkins, J E; Uckan, T; Vander Sluis, K L; Wilgen, J B; Win,

In low-collisionality plasmas confined in tokamaks and stellarators, instabilities driven by particles trapped in inhomogeneities of the magnetic fields could be important in increasing plasma transport coefficients. In the Advanced Toroidal Facility (ATF), an {ell} = 2, M = 12 field-period stellarator device with major radius R = 2.1 m, average plasma minor radius a = 0.27 m, central and edge rotational transforms {chi}{sub 0} {approx} 0.3, {chi}{sub a} {approx} 1, the effects of electron trapping in the helical stellarator field are expected to be important in plasmas with {bar n}{sub e} {approx} 5 {times} 10{sup 12} cm{sup {minus}3}, T{sub e0} {approx} 1 keV. Such plasmas have already been sustained for long-pulses (20 s) using 150--400 kW of 53.2-GHz ECH power at B = 0.95 T. Transport analysis shows that for {rho} = r/a {le} 1/3, the electron anomalous transport is {le}10 times the neoclassical value, while at {rho} = 2/3 it is 10--100 times neoclassical; this is compatible with expectations for transport enhancement due to dissipative trapped-electron modes. 4 refs., 3 figs.

• Research Organization: Oak Ridge National Lab., TN (USA)
• Sponsoring Organization: USDOE; USDOE, Washington, DC (USA)
• DOE Contract Number: AC05-84OR21400
• OSTI ID: 5816794
• Report Number(s): CONF-910609-6; ON: DE91010807
• Resource Relation: Conference: 18. European conference on controlled fusion and plasma physics, Berlin (Germany, F.R.), 3-7 Jun 1991
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ATF TORSATRON
CHARGED-PARTICLE TRANSPORT
TRAPPED-PARTICLE INSTABILITY
ECR HEATING
FLUCTUATIONS
MAGNETIC FIELDS
QUADRUPOLES
TRAPPED ELECTRONS
TURBULENCE
CLOSED PLASMA DEVICES
ELECTRONS
ELEMENTARY PARTICLES
FERMIONS
HEATING
HIGH-FREQUENCY HEATING
INSTABILITY
LEPTONS
MULTIPOLES
PLASMA HEATING
PLASMA INSTABILITY
PLASMA MACROINSTABILITIES
RADIATION TRANSPORT
STELLARATORS
THERMONUCLEAR DEVICES
TORSATRON STELLARATOR
VARIATIONS
700103* - Fusion Energy- Plasma Research- Kinetics
700107 - Fusion Energy- Plasma Research- Instabilities