Effects of fuel-shell mix upon direct-drive, spherical implosions on OMEGA.
Fuel-shell mix and implosion performance are studied for many capsule types in direct-drive experiments at OMEGA. The amount of mixing and the size of the mix region are inferred from charged-particle spectrometry data and confirmed with an experimentally constrained model. Measured yields and convergence ratios CR fall short of one-dimensional predictions, especially for low capsule fill pressures. CR is approximately 11 for pressures from 3 to 15 atm, in contrast to predictions of approximately 25 for 3 atm and approximately 12 for 15 atm. The performance shortfalls are likely to be caused by fuel-shell mix.
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Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge 02139, USA.
Séguin
F H
FH
Frenje
J A
JA
Kurebayashi
S
S
Petrasso
R D
RD
Meyerhofer
D D
DD
Soures
J M
JM
Delettrez
J A
JA
Glebov
V Yu
VY
Radha
P B
PB
Regan
S P
SP
Roberts
S
S
Sangster
T C
TC
Stoeckl
C
C