A Plasma Source with LaB6 Hollow Cathode for a Diagnostic Beam Injector
Abstract
The hydrogen neutral beams are widely used to diagnose the plasma in magnetic fusion devices. The beams are extracted from the plasma generated by a plasma source, accelerated to desired energy and subsequently neutralized in a gas target. The critically important characteristics of the plasma source are the composition and the source lifetime. A presence of the molecular ions in the plasma results in appearing of atoms in the beam with energies E, E/2, and E/3, where E is the determined by accelerating voltage (E=eU). For example, the plasma sources of the diagnostic injectors developed for TEXTOR and TCV tokamaks 1,2, which are based on RF-discharge, has a long enough lifetime (many thousands shots) for a pulse duration 2-10 sec. At the same time, the proton fraction in the RF-plasma is about only 60% by current 2,3.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 20, 2003
- Accession Number
- ADP014995
Entities
People
- A. A. Ivanov
- A. Kreter
- B. Schweer
- P. P. Deichuli
- V. L. Davydenko