Multiple-frequency electron cyclotron heating of hot electron rings in EBT-I

Technical Report · Wed May 01 04:00:00 EDT 1985

DOI:https://doi.org/10.2172/5734449· OSTI ID:5734449

Rasmussen, D. A.; Bigelow, T. S.; Batchelor, D. B.; Hillis, D. L.; Haste, G. R.; Quon, B. H.; Hankins, O. E.

The use of multiple-frequency microwave power for electron cyclotron heating (MFECH) significantly increased the ring stored energy in the SM-1 simple mirror device. MFECH was used on ELMO Bumpy Torus (EBT) in an effort to increase its hot electron beta. No substantial improvement in the ring parameters was observed in a series of two-frequency ECH experiments, with frequency separations up to 90 MHz, in contrast to the dramatic improvement found in the axisymmetric SM-1 experiment. The absence of superadiabatic behavior by the energetic electrons, combined with the effects of reduced heating efficiency and the additional ring losses introduced by the canting of the EBT mirror sectors, appears to limit the hot electron ring beta.

• Research Organization: Oak Ridge National Lab., TN (USA)
• DOE Contract Number: AC05-84OR21400
• OSTI ID: 5734449
• Report Number(s): ORNL/TM-9372; ON: DE85011302
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700101* -- Fusion Energy-- Plasma Research-- Confinement
Heating
& Production
ADIABATIC PROCESSES
BETA RATIO
BUMPY TORI
ECR HEATING
EFFICIENCY
ELECTRON RINGS
ELMO BUMPY TORUS
ELMO DEVICES
HEATING
HIGH-FREQUENCY HEATING
MAGNETIC MIRRORS
OPEN PLASMA DEVICES
PLASMA HEATING
THERMONUCLEAR DEVICES