Speaker
A. Dunaevsky
(Tri Alpha Energy)
Description
In the C-2 field-reversed configuration (FRC) experiment, tangential neutral beam injection (NBI), coupled with electrically-biased plasma guns at the plasma ends and advanced surface conditioning, led to dramatic reductions in turbulence-driven losses.11 Under such conditions, highly reproducible, macroscopically stable, hot FRCs with a significant fast-ion population, total plasma temperature of ~ 1 keV and record lifetimes were achieved.22
To further improve the FRC sustainment and provide a better coupling with beams, the C-2 device has been upgraded with a new NBI system, which can deliver up to a total of 10 MW of hydrogen beam power (15 keV, 8 ms pulse), by far the largest ever used in compact toroid plasma experiments. The NBI system consists of six highly reliable and robust positive-ion based injectors featuring flexible, modular design. This presentation provides a comprehensive overview of the C-2U NBI system, including: 1) NBI test facility, beam characterization, and acceptance tests, 2) integration with the machine and operating experience, 3) improvements in plasma performance with increased beam power.
[1] M. Tuszewski et. al, Phys. Rev. Lett 108, 255008 (2012).[2] M.W. Binderbauer et al., Phys. Plasmas 22, 056110 (2015).
Co-authors
A. Dunaevsky
(Tri Alpha Energy, Inc, Rancho Santa Margarita, CA 92688, United States)
A. Ivanov
(Budker Institute of Nuclear Physics, Novosibirsk 630090, Russian Federation)
A. Smirnov
(Tri Alpha Energy, Inc, Rancho Santa Margarita, CA 92688, United States)
G. Abdrashitov
(Budker Institute of Nuclear Physics, Novosibirsk 630090, Russian Federation)
M. Binderbauer
(Tri Alpha Energy, Inc, Rancho Santa Margarita, CA 92688, United States)
S. Korepanov
(Tri Alpha Energy, Inc, Rancho Santa Margarita, CA 92688, United States)
V. Kapitonov
(Budker Institute of Nuclear Physics, Novosibirsk 630090, Russian Federation)
V. Kolmogorov
(Budker Institute of Nuclear Physics, Novosibirsk 630090, Russian Federation)
