TY - GEN
T1 - Turbulence spreading through a transport barrier
AU - Hahm, T. S.
AU - Wang, W. X.
AU - Rewoldt, G.
AU - Manickam, J.
AU - Tang, W. M.
PY - 2006
Y1 - 2006
N2 - Turbulence spreading through a transport barrier is studied using newly developed gyrokinetic simulation capabilities including the mean E x B shear and non-circular cross section. We perform a series of numerical experiments by placing an Er well, with varying strength, next to the region where the ITG instability is linearly unstable. It is found that an E x B shear layer with an experimentally relevant level of the shearing rate can significantly reduce the spreading extent and speed of the propagation. From the spatio-temporal evolution of the turbulence propagation front, we find that the spreading slows down significantly in the region of higher shearing rate, rather than at the bottom of the Er well. Therefore, the E x B shearing rate, ωE, is the key local quantity in slowing down the turbulence spreading.
AB - Turbulence spreading through a transport barrier is studied using newly developed gyrokinetic simulation capabilities including the mean E x B shear and non-circular cross section. We perform a series of numerical experiments by placing an Er well, with varying strength, next to the region where the ITG instability is linearly unstable. It is found that an E x B shear layer with an experimentally relevant level of the shearing rate can significantly reduce the spreading extent and speed of the propagation. From the spatio-temporal evolution of the turbulence propagation front, we find that the spreading slows down significantly in the region of higher shearing rate, rather than at the bottom of the Er well. Therefore, the E x B shearing rate, ωE, is the key local quantity in slowing down the turbulence spreading.
UR - https://www.scopus.com/pages/publications/84872652744
UR - https://www.scopus.com/pages/publications/84872652744#tab=citedBy
M3 - Conference contribution
AN - SCOPUS:84872652744
SN - 9781622763337
T3 - 33rd EPS Conference on Plasma Physics 2006, EPS 2006
SP - 1688
EP - 1691
BT - 33rd EPS Conference on Plasma Physics 2006, EPS 2006 - Europhysics Conference Abstracts
T2 - 33rd European Physical Society Conference on Plasma Physics 2006, EPS 2006
Y2 - 19 June 2006 through 23 June 2006
ER -