TY - JOUR
T1 - Low recycling and high power density handling physics in the Current Drive Experiment-Upgrade with lithium plasma-facing components
AU - Kaita, R.
AU - Majeski, R.
AU - Gray, T.
AU - Kugel, H.
AU - Mansfield, D.
AU - Spaleta, J.
AU - Timberlake, J.
AU - Zakharov, L.
AU - Doerner, R.
AU - Lynch, T.
AU - Maingi, R.
AU - Soukhanovskii, V.
PY - 2007
Y1 - 2007
N2 - The Current Drive Experiment-Upgrade [T. Munsat, P. C. Efthimion, B. Jones, R. Kaita, R. Majeski, D. Stutman, and G. Taylor, Phys. Plasmas 9, 480 (2002)] spherical tokamak research program has focused on lithium as a large area plasma-facing component (PFC). The energy confinement times showed a sixfold or more improvement over discharges without lithium PFCs. This was an increase of up to a factor of 3 over ITER98P(y,1) scaling [ITER Physics Basis Editors, Nucl. Fusion 39, 2137 (1999)], and reflects the largest enhancement in confinement ever seen in Ohmic plasmas. Recycling coefficients of 0.3 or below were achieved, and they are the lowest to date in magnetically confined plasmas. The effectiveness of liquid lithium in redistributing heat loads at extremely high power densities was demonstrated with an electron beam, which was used to generate lithium coatings. When directed to a lithium reservoir, evaporation occurred only after the entire volume of lithium was raised to the evaporation temperature. The ability to dissipate a beam power density of about 60 MW m2 could have significant consequences for PFCs in burning plasma devices.
AB - The Current Drive Experiment-Upgrade [T. Munsat, P. C. Efthimion, B. Jones, R. Kaita, R. Majeski, D. Stutman, and G. Taylor, Phys. Plasmas 9, 480 (2002)] spherical tokamak research program has focused on lithium as a large area plasma-facing component (PFC). The energy confinement times showed a sixfold or more improvement over discharges without lithium PFCs. This was an increase of up to a factor of 3 over ITER98P(y,1) scaling [ITER Physics Basis Editors, Nucl. Fusion 39, 2137 (1999)], and reflects the largest enhancement in confinement ever seen in Ohmic plasmas. Recycling coefficients of 0.3 or below were achieved, and they are the lowest to date in magnetically confined plasmas. The effectiveness of liquid lithium in redistributing heat loads at extremely high power densities was demonstrated with an electron beam, which was used to generate lithium coatings. When directed to a lithium reservoir, evaporation occurred only after the entire volume of lithium was raised to the evaporation temperature. The ability to dissipate a beam power density of about 60 MW m2 could have significant consequences for PFCs in burning plasma devices.
UR - https://www.scopus.com/pages/publications/34249880354
UR - https://www.scopus.com/inward/citedby.url?scp=34249880354&partnerID=8YFLogxK
U2 - 10.1063/1.2718509
DO - 10.1063/1.2718509
M3 - Article
AN - SCOPUS:34249880354
SN - 1070-664X
VL - 14
JO - Physics of Plasmas
JF - Physics of Plasmas
IS - 5
M1 - 056111
ER -