Negative ion research at the Culham Centre for Fusion Energy (CCFE)

Negative ion research at the Culham Centre for Fusion Energy (CCFE)

Negative ion research at the Culham Centre for Fusion Energy (CCFE) 150 150 Mathew
CCFE-PR(16)46

Negative ion research at the Culham Centre for Fusion Energy (CCFE)

A summary of negative ion development work being presently undertaken at the Culham Centre for Fusion Energy (CCFE) is given. The Small Negative Ion Facility (SNIF) has an RF driven volume ion source with beam extraction at energies up to 30keV. The extracted beam of Hions has an associated co-extracted electron beam with an electron to ion ratio of <1 over the whole range of operating parameters. In order to understand this performance spectroscopic investigations have been undertaken using the Balmer series line to determine the electron temperature. In addition a 1D fluid model of an RF driven ion source is also under development. This model is based on a successful model for both arc discharge positive and negative ion sources. Additional system studies of neutral beam injection systems for future fusion machines beyond ITER are being carried out. This is required to understand the limits of various neutralisation and energy recovery systems in order to maximise overall electrical efficiency.

Collection:
Journals
Journal:
New Journal of Physics
Publisher:
IOP
Published date:
12/01/2016