TY - JOUR
T1 - Transitional modelling of the neutral gas in the JET neutraliser
AU - Porton, M.
AU - Shapiro, E.
AU - Drikakis, D.
PY - 2010/8/31
Y1 - 2010/8/31
N2 - Effective understanding of gas flow is important to ensure efficient operation of gas neutraliser systems such as that used at Joint European Torus (JET), which form part of neutral beam heating systems for nuclear fusion experiments. Offering a means of neutralising the charge of initially ionic beams, gas neutralisers permit the injection of beams of neutral particles into the tokamak vessel, which serve to both heat the plasma and drive plasma current. Within the JET neutraliser, gas flow encompasses both the continuum-transition and molecular flow regimes, encouraging the application of novel techniques. The first application of the Augmented Burnett Equations to these systems is presented with results compared to experimental pressure profile data. The results demonstrate that the application of the Augmented Burnett Equations is a valid modelling approach. The strong dependence of accuracy upon outlet KnKn is noted and good agreement found with experiment as rarefaction approaches the molecular limit of Kn=1Kn=1, beyond the theoretical domain of applicability.
AB - Effective understanding of gas flow is important to ensure efficient operation of gas neutraliser systems such as that used at Joint European Torus (JET), which form part of neutral beam heating systems for nuclear fusion experiments. Offering a means of neutralising the charge of initially ionic beams, gas neutralisers permit the injection of beams of neutral particles into the tokamak vessel, which serve to both heat the plasma and drive plasma current. Within the JET neutraliser, gas flow encompasses both the continuum-transition and molecular flow regimes, encouraging the application of novel techniques. The first application of the Augmented Burnett Equations to these systems is presented with results compared to experimental pressure profile data. The results demonstrate that the application of the Augmented Burnett Equations is a valid modelling approach. The strong dependence of accuracy upon outlet KnKn is noted and good agreement found with experiment as rarefaction approaches the molecular limit of Kn=1Kn=1, beyond the theoretical domain of applicability.
KW - neutraliser gas
KW - JET
KW - augmented Burnett equations
KW - transitional modelling
KW - joint european torus
UR - http://www.scopus.com/inward/record.url?eid=2-s2.0-77955415627&partnerID=40&md5=8cdd5b324257dc8e39e8b7ca17f47ec9
U2 - 10.1016/j.fusengdes.2010.05.027
DO - 10.1016/j.fusengdes.2010.05.027
M3 - Article
SN - 0920-3796
VL - 85
SP - 789
EP - 795
JO - Fusion Engineering and Design
JF - Fusion Engineering and Design
IS - 5
ER -