Speaker
Dr
Sergey Murakhtin
(Budker Institute of Nuclear Physics)
Description
The main problem in open magnetic traps is a longitudinal energy transport through a magnetic mirror. Heating target plasma in the central cell Gas Dynamic Trap (GDT) is limited reversed flow of cold electrons from the region expander. The interaction of cold electrons space charge and ambipolar potential can lead to deformation of the electrostatic potential and emerging of "trapped" electrons.
In the GDT device, we study the influence of the neutral gas in the expander on the basic parameters of plasma in the central cell. An artificial local target of the neutral gas will be formed on the axis in the expander. A grid energy analyzer for detecting ions accelerated in the ambipolar potential will be set on the target plate. Moving the artificial target along the axis one can measure an ambipolar potential profile.
We have created an intense molecular source based on microchannel plates (MCP). It forms a helium beam with divergence angle 0.1 rad., current density on the axis 100 mA/cm$^2$ and an average particle beam energy 0.03 eV. The poster shows experimental measurements of the current density profile molecular beam. This result was compared with the theoretical model.
Primary author
Dr
Sergey Murakhtin
(Budker Institute of Nuclear Physics)
Co-authors
Mr
Artem Chernyavsky
(Novosibirsk State Technical University)
Dr
Dmitriy Skovorodin
(Budker Institute of Nuclear Physics)
Ms
Olga Korobeynikova
(Budker Institute of Nuclear Physics)
