Ion Bernstein wave heating experiments on Alcator C

Conference · Tue Sep 01 04:00:00 EDT 1987 · AIP Conf. Proc.; (United States)

OSTI ID:6933907

Moody, J D; Porkolab, M; Fiore, C L; McDermott, F S; Takase, Y; Terry, J; Wolfe, S M

ICRF ion Bernstein wave heating has been studied on the Alcator C tokamak in both the hydrogen 3/2 (B = 7.6T) and deuterium 5/2(B = 9.3T, ..omega.. = 3..omega../sub c//sub D/ at the plasma edge, x/aapprox. =0.87) subharmonic regimes. Rf power of up to 180 kW at 183.6 MHz was coupled into the plasma for up to 150 ms using a toroidal current loop with a loading resistance between 1 and 2..cap omega... Ion heating effieciencies, n-bar/sub e/..delta..T/sub i//P/sub r//sub f/, of up to 5.5 eV m/sup -3//kW at B = 9.3T and 2.5 eV m/sup -3//kW at B = 7.6T at n-bar/sub e//sub (Oh)/ = 0.8 x 10/sup 20/ m/sup -3/ were observed. A two temperature minority (deuterium) (T/sub D/<2000eV for n/sub D//n/sub H//sub +//sub D/<20%) ion distribution as well as improvements by a factor of 2--3 in global particle confinement and central impurity confinement times are observed in both cases. The energy confinement time, tau/sub E/, increased from 5 ms to 7.7 ms with an average incremental confinement time, ..delta..W/sub total//..delta..P/sub total/, of 11 ms for the 9.3T case. For the B = 7.6T case, tau/sub E/ changed from 5 ms (Ohmic) to between 3 ms and 8 ms. At higher densities, n-bar/sub e/>2 x 10/sup 20/ m/sup -3/, the heating becomes inefficient.

• Research Organization: Plasma Fusion Center, M.I.T., Cambridge, MA 02139
• OSTI ID: 6933907
• Report Number(s): CONF-870570-
• Conference Information: Journal Name: AIP Conf. Proc.; (United States) Journal Volume: 159:1
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700101* -- Fusion Energy-- Plasma Research-- Confinement
Heating
&amp; Production
700108 -- Fusion Energy-- Plasma Research-- Wave Phenomena
ALCATOR DEVICE
ANTENNAS
BERNSTEIN MODE
CHARGED PARTICLES
CLOSED PLASMA DEVICES
CONFINEMENT
CYCLOTRON HARMONICS
DATA
DEUTERIUM
EFFICIENCY
ELECTRICAL EQUIPMENT
ELEMENTS
EQUIPMENT
EXPERIMENTAL DATA
FREQUENCY RANGE
HARMONICS
HEATING
HIGH-FREQUENCY HEATING
HYDROGEN
HYDROGEN ISOTOPES
ICR HEATING
INFORMATION
ION TEMPERATURE
IONS
ISOTOPES
LIGHT NUCLEI
MHZ RANGE
MHZ RANGE 100-1000
NONMETALS
NUCLEI
NUMERICAL DATA
ODD-ODD NUCLEI
OSCILLATION MODES
OSCILLATIONS
PLASMA
PLASMA CONFINEMENT
PLASMA HEATING
STABLE ISOTOPES
THERMONUCLEAR DEVICES
TOKAMAK DEVICES