Simple annulus power balance in EBT-I
An essential feature of the ELMO Bumpy Torus (EBT) concept is the presence of a relativistic electron annulus in each of the toroidal mirror sectors. These high beta annuli are formed and sustained by microwave heating and are of sufficient density and temperature that diamagnetic currents produce the necessary minimum in the magnetic field required for MHD stability of the toroidal core plasma. Because electron rings play an important role in confinement characteristics and performance of EBT, the trade-off between the quality of the confinement afforded by the rings and the power required to sustain the rings represents an important problem in a fusion reactor. Theoretical estimates of the microwave power required to sustain the annulus are found to be within a factor of 2 of the experimentally determined value. Scaling projections that are shown for both EBT-I and EBT-S enable one to examine the sensitivity of the annulus electron temperature as a function of core plasma density for various microwave power levels. The results are found to be sensitive to the details of the hot electron distribution function as well as geometric and scaling parameters. Improvements to the model are under way in order to increase its capability and accuracy in assessing the overall power balance.
- Research Organization:
- Oak Ridge National Lab., TN (USA)
- DOE Contract Number:
- W-7405-ENG-26
- OSTI ID:
- 5992327
- Report Number(s):
- ORNL/TM-6910
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700101* -- Fusion Energy-- Plasma Research-- Confinement
Heating
& Production
DISTRIBUTION FUNCTIONS
ECR HEATING
ELECTROMAGNETIC RADIATION
ELECTRON RINGS
ELMO BUMPY TORUS
ELMO DEVICES
ENERGY BALANCE
HEATING
HIGH-BETA PLASMA
HIGH-FREQUENCY HEATING
MAGNETIC MIRRORS
MICROWAVE RADIATION
OPEN PLASMA DEVICES
PLASMA
PLASMA HEATING
RADIATIONS
SCALING LAWS
THERMONUCLEAR DEVICES
700101* -- Fusion Energy-- Plasma Research-- Confinement
Heating
& Production
DISTRIBUTION FUNCTIONS
ECR HEATING
ELECTROMAGNETIC RADIATION
ELECTRON RINGS
ELMO BUMPY TORUS
ELMO DEVICES
ENERGY BALANCE
HEATING
HIGH-BETA PLASMA
HIGH-FREQUENCY HEATING
MAGNETIC MIRRORS
MICROWAVE RADIATION
OPEN PLASMA DEVICES
PLASMA
PLASMA HEATING
RADIATIONS
SCALING LAWS
THERMONUCLEAR DEVICES