Referenced in: none

Automatically associated channels: Kir6.2

Title: Characterization of 1 MW, 40 keV, 1 s neutral beam for plasma heating.

Authors: A Sorokin, V Belov, V Davydenko, P Deichuli, A Ivanov, A Podyminogin, I Shikhovtsev, G Shulzhenko, N Stupishin, M Tiunov

Journal, date & volume: Rev Sci Instrum, 2010 Feb , 81, 02B108

PubMed link: http://www.ncbi.nlm.nih.gov/pubmed/20192415

Abstract
Neutral beam with geometrical focusing for plasma heating in moderate-size plasma devices has been developed in Budker Institute of Nuclear Physics, Novosibirsk. When operated with hydrogen, the neutral beam power is 1 MW, pulse duration is 1 s, beam energy is 40 keV, and angular divergence is 1.2 degrees. Initial ion beam is extracted and accelerated by triode multiapertures ion-optical system. To produce 1 MW neutral beam, about 40 A proton current is extracted with nominal current density of 320 mA/cm(2). Ion-optical system has 200 mm diameter grids with 44% transparency. The grids have inertia cooling and heat is removed between the pulses by water flowing in channels placed on periphery of the grids. A plasma emitter for ion extraction is produced by rf-plasma box. Ion species mix of rf plasma source amounts to 70%, 20%, and 10% of H(+), H(2)(+), and H(3)(+) ions, respectively, by current. Heavy impurities contribute less than 0.3%.