Speaker
Mr
Ivan Emelev
(Budker Institute of Nuclear Physics)
Description
The results of the experimental study of build-up and confinement of low-temperature plasma target for neutralization of high energy negative ion beam are presented in the paper.
The plasma target cylindrical vacuum chamber is 1.2 m long and 0.2 m in diameter. The axisymmetric multicusp magnetic field is formed at the periphery of the target chamber by using an array of the permanent NdFeB magnets which are placed closely on the thin chamber walls. The magnetic field at the surface of the chamber reaches 7 kGs. The target chamber are ended by the two diaphragms with the two 0.1m diameter apertures for the negative ion beam passing through. For reduction of the plasma losses through the ends, the inverse magnetic field are formed in the apertures [1].
The plasma is produced in the target by ionization of the working gas by electrons, which emitted by six plane LaB6 cathode, which are placed uniformly over azimuth at the center of the plasma target near the wall.
The discharge duration is set to 1 s. In short pulses at 300 kW power, the hydrogen plasma with density n$_i$ ≈2.5$\cdot$10$^{13}$ cm$^{-3}$ is produced. Spatial profiles of the plasma parameters in the target were measured.
1. G.I. Dimov, A.V.Ivanov, Fusion Science and Technology, 2013, v.63, issue 1T, p.111-114.
Primary author
Mr
Ivan Emelev
(Budker Institute of Nuclear Physics)
Co-authors
Dr
Alexander Ivanov
(Budker Institute of Nuclear Physics)
Prof.
Gennady Dimov
(Budker Institute of Nuclear Physics)
