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Laser photodetachment neutraliser for negative ion beams
- Source :
-
Fusion Engineering & Design . Aug2010, Vol. 85 Issue 5, p745-751. 7p. - Publication Year :
- 2010
-
Abstract
- Abstract: We outline a speculative design for a photodetachment neutraliser for a negative ion neutral beam system, with neutralisation efficiency of 95% or more. The practical difficulties are enormous. The ion beam must pass through an optical cavity capable of reflecting the light many times. For 500 reflections, the laser optical power output ∼800kW, giving circulating power ∼400MW. All sources of light loss combined need to be kept to 0.2% or less per pass. The losses due to photodetachment itself, and due to Thomson scattering in the beam plasma are negligible. A key task is to maintain the reflectance of the mirrors above 99.97% for long periods of operation, protecting all the components from thermal and neutron damage, and from caesium, sputtered atoms and other contamination. A diode-pumped Nd-doped YAG laser can have overall electrical-to-light (“wall-plug”) efficiency up to 25%. A DEMO concept reactor such as the EU Power Plant Conceptual Study (PPCS) Model B requires 270MW heating power. If this is all provided by neutral beams, then a laser neutraliser might reduce the electrical power consumption for this from 900MW to 520MW. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 09203796
- Volume :
- 85
- Issue :
- 5
- Database :
- Academic Search Index
- Journal :
- Fusion Engineering & Design
- Publication Type :
- Academic Journal
- Accession number :
- 52821337
- Full Text :
- https://doi.org/10.1016/j.fusengdes.2010.04.055