NEUTRALIZATION MEASUREMENTS FOR THE JET INJECTION
The obvious consequence of the low neutralization efficiency is that the neutral power to JET will be lower than predicted. This can be ameliorated to some extent by increasing the gas flow. The measured gas flow to create the design gas target in the absence of the beam is 18 Torr.1.sec**-1. This can be increased to 25 Torr.1.sec**-1 without exceeding limits such as the power lost due to re-ionization or the power loading to the extraction rigs. Nevertheless the gas target in the presence of the beam will be substantially below the design figure of 10**16cms**-2. The reason for the low neutralization is likely to be heating of the neutralizer gas by the beam. It is probable that the size of the neutraliser c.f. the mean free path of the molecules is significant in determining the equilibrium temperature of the gas and thus should be taken into account in the design of the future systems.
Bibliographic Reference: 13TH EUROPEAN CONFERENCE ON CONTROLLED FUSION AND PLASMA HEATING, SCHLIERSEE (GERMANY), APRIL 14-18, 1986 PP. 97-100 WRITE TO THE PUBLICATIONS OFFICER, JET JOINT UNDERTAKING, ABINGDON, OXON, OX14 3EA (UK) MENTIONING REPORT JET-P(86)15, 1986
Record Number: 1989125009600 / Last updated on: 1987-01-01
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