Journal
NUCLEAR FUSION
Volume 55, Issue 5, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0029-5515/55/5/053009
Keywords
mirror trap; gas dynamic trap; electron-cyclotron resonance heating; longitudinal confinement
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Funding
- Russian Scientific Foundation [14-12-01007]
- Russian Science Foundation [14-12-01007] Funding Source: Russian Science Foundation
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This paper summarizes the results of experiments on electron cyclotron resonance heating (ECRH) of plasma obtained at the axially symmetric magnetic mirror device gas dynamic trap (GDT) (Budker Institute, Novosibirsk). The main achievement is the demonstration of plasma discharges with extremely high temperatures of bulk electrons. According to the Thomson scattering measurements, the on-axis electron temperature averaged over several sequential shots is 660 +/- 50 eV with peak values exceeding 900 eV in a few shots. This corresponds to an at least threefold increase as compared to previous experiments both at the GDT and at other comparable machines, thus demonstrating the maximum quasi-stationary (similar to 0.6 ms) electron temperature achieved in open traps. The breakthrough is made possible with the successful implementation of a sophisticated ECRH scheme in addition to standard heating by neutral beams (NBs). Another important result is the demonstration of the significantly increased lifetime of NB-driven fast particles with the application of ECRH, leading to a 30% higher plasma energy content at the end of the discharge. All available data including the previously demonstrated possibility of plasma confinement with beta as high as 60%, allows us to consider fusion applications of axially symmetric magnetic mirror machines on a realistic basis.
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