Speaker
Vladimir V. Postupaev
Description
See the full Abstract at http://ocs.ciemat.es/EPS2018ABS/pdf/P1.1035.pdf
Work Progress on GOL-NB Multiple-Mirror Trap
V.V. Postupaev1,2, V.I. Batkin1,2, A.D. Beklemishev1,2, A.V. Burdakov1,3, V.S. Burmasov1,2,
I. A. Ivanov1,2, K. N. Kuklin1, K. I. Mekler1, A. F. Rovenskikh1, and E. N. Sidorov1
1
Budker Institute of Nuclear Physics, 630090 Novosibirsk, Russia
2
Novosibirsk State University, 630090 Novosibirsk, Russia
3
Novosibirsk State Technical University, 630092 Novosibirsk, Russia
The GOL-NB project is a next-step experiment on multiple-mirror plasma confinement in
the Budker Institute of Nuclear Physics [1]. Currently, it enters the assembly state with the
first plasma in a start configuration scheduled for the first half of 2018. The final
configuration of the device will include a 2.5-m-long central gasdynamic trap with two
attached multiple-mirror sections of 3 m each, and two end magnetic flux expanders that
house a start plasma creation system, plasma receiver endplates and a system of biased
electrodes for plasma stabilization. Plasma will be heated by two 0.75 MW, 25 keV neutral
beams. The device is the deep reconstruction of the previous GOL-3 multiple-mirror trap; it
reuses some part of the magnetic system and infrastructure from the latter. In the final
configuration, GOL-NB will be a scaled-down physical model of a future fusion-grade
reactor system.
The GOL-NB assembly schedule uses one of the engineering advantages of linear
confinement systems. Fast start of commissioning of different subsystems and the first
plasma can be achieved before readiness of the each component of magnetic and vacuum
systems. Currently, the start configuration includes both expander tanks, a cold start plasma
source, a multiple-mirror solenoid with 34 coils (instead of 2×28 coils in the final system),
and a short temporary section for the on-site commissioning of NBIs.
Before start of the assembly, experiments with a prototype plasma source in the existing
section of magnetic system were done. We demonstrated that a plasma stream from an arc
source was successfully compressed by the converging magnetic field and transported
through a 3-m-long vacuum system thus imitating the process of start plasma creation in
GOL-NB. No significant differences of plasma transport in regimes with the multiple-
mirror field from ones in a uniform magnetic field were found.
[1] V.V. Postupaev, et al., Nuclear Fusion, 57, 036012 (2017).
