Power balance in ELMO Bumpy Torus: bulk electrons and ions in a 37 kW discharge
The power balance of the bulk electrons and ions in discharges with 37 kW of applied microwave power in the ELMO Bumpy Torus (EBT) is examined in a zero-dimensional model using data on the intensity and linewidth of the molecular and atomic hydrogen emission. At least 60% of the applied power is ultimately dissipated by processes involving the neutral particles, including dissociation of molecules, ionization of and radiation from atoms, and heating of cold electrons produced during atomic ionization. The molecular influx rate and the density of atoms are used independently to determine the bulk electron particle confinement time, and an upper bound estimate is made of the diffusional power loss from the bulk plasma electrons. Parameters derived from the basic spectroscopic data presented in this paper include the neutral atom density 2 - 5x10/sup 10/ cm/sup -3/, incident molecular flux 3 - 5x10/sup 15/ cm/sup -2/s/sup -1/, bulk ion temperature approx. =3 eV, and particle confinement time <1.1 ms. The bulk electron energy confinement time is 0.7 ms or less in the standard operating regime. Published data on the nonthermal electron and ion populations in the plasma are used to evaluate approximately the overall energy flow in the discharge. 54 refs.
- Research Organization:
- Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
- DOE Contract Number:
- AC02-76CH03073
- OSTI ID:
- 6358521
- Report Number(s):
- PPPL-2248; ON: DE86005044
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ELMO BUMPY TORUS
ELECTRIC DISCHARGES
ENERGY BALANCE
MICROWAVE HEATING
POWER RANGE 10-100 KW
ELECTRONS
IONS
MATHEMATICAL MODELS
BUMPY TORI
CHARGED PARTICLES
ELEMENTARY PARTICLES
ELMO DEVICES
FERMIONS
HEATING
LEPTONS
MAGNETIC MIRRORS
OPEN PLASMA DEVICES
THERMONUCLEAR DEVICES
700101* - Fusion Energy- Plasma Research- Confinement
Heating
& Production