TY - GEN
T1 - Continuum-transition models of neutralizer gas heating
AU - Porton, M.
AU - Drikakis, D.
AU - Shapiro, E.
AU - Surrey, E.
N1 - Copyright:
Copyright 2009 Elsevier B.V., All rights reserved.
PY - 2009
Y1 - 2009
N2 - Indirect heating of neutralizer gas by the beam is believed to be responsible for the reduced neutralization efficiency encountered in positive ion neutral beam systems. This effect depends upon the details of gas flow within the neutralizer, which previous models have been unable to fully evaluate. Modeling this flow offers a significant challenge due to the gas flow regime encountered in such systems, and the numerous gas sources and sinks created by the neutralizer contents. Within the presented model, the Augmented Burnett Equations are used to simulate the continuum-transition gas flow within the neutralizer, with the development of detailed mass and energy sources and sinks to model a consistent gas-beam-plasma system. The 3-D model, originally developed for application to the JET positive neutral injection system, has been adapted for ITER relevant negative ion systems. The results suggest that the ITER neutralizer is subject to much reduced gas heating effects and no significant loss of neutralization target.
AB - Indirect heating of neutralizer gas by the beam is believed to be responsible for the reduced neutralization efficiency encountered in positive ion neutral beam systems. This effect depends upon the details of gas flow within the neutralizer, which previous models have been unable to fully evaluate. Modeling this flow offers a significant challenge due to the gas flow regime encountered in such systems, and the numerous gas sources and sinks created by the neutralizer contents. Within the presented model, the Augmented Burnett Equations are used to simulate the continuum-transition gas flow within the neutralizer, with the development of detailed mass and energy sources and sinks to model a consistent gas-beam-plasma system. The 3-D model, originally developed for application to the JET positive neutral injection system, has been adapted for ITER relevant negative ion systems. The results suggest that the ITER neutralizer is subject to much reduced gas heating effects and no significant loss of neutralization target.
KW - Augmented Burnett Equations
KW - Continuum-transition
KW - Gas heating
KW - Neutralizer
UR - http://www.scopus.com/inward/record.url?scp=70350738748&partnerID=8YFLogxK
U2 - 10.1109/FUSION.2009.5226424
DO - 10.1109/FUSION.2009.5226424
M3 - Conference contribution
AN - SCOPUS:70350738748
SN - 9781424426362
T3 - Proceedings - Symposium on Fusion Engineering
BT - 2009 23rd IEEE/NPSS Symposium on Fusion Engineering, SOFE 2009
T2 - 2009 23rd IEEE/NPSS Symposium on Fusion Engineering, SOFE 2009
Y2 - 1 June 2009 through 5 June 2009
ER -