Diagnostics for fast ignition science (invited).
The ignition concept for electron fast ignition inertial confinement fusion requires sufficient energy be transferred from an approximately 20 ps laser pulse to the compressed fuel via approximately MeV electrons. We have assembled a suite of diagnostics to characterize such transfer, simultaneously fielding absolutely calibrated extreme ultraviolet multilayer imagers at 68 and 256 eV; spherically bent crystal imagers at 4.5 and 8 keV; multi-keV crystal spectrometers; MeV x-ray bremmstrahlung, electron and proton spectrometers (along the same line of sight), and a picosecond optical probe interferometer. These diagnostics allow careful measurement of energy transport and deposition during and following the laser-plasma interactions at extremely high intensities in both planar and conical targets. Together with accurate on-shot laser focal spot and prepulse characterization, these measurements are yielding new insights into energy coupling and are providing critical data for validating numerical particle-in-cell (PIC) and hybrid PIC simulation codes in an area crucial for fast ignition and other applications. Novel aspects of these diagnostics and how they are combined to extract quantitative data on ultrahigh intensity laser-plasma interactions are discussed.
MacPhee
A G
AG
Lawrence Livermore National Laboratory, Livermore, California 94551, USA. macphee2@llnl.gov
Akli
K U
KU
Beg
F N
FN
Chen
C D
CD
Chen
H
H
Clarke
R
R
Hey
D S
DS
Freeman
R R
RR
Kemp
A J
AJ
Key
M H
MH
King
J A
JA
Le Pape
S
S
Link
A
A
Ma
T Y
TY
Nakamura
H
H
Offermann
D T
DT
Ovchinnikov
V M
VM
Patel
P K
PK
Phillips
T W
TW
Stephens
R B
RB
Town
R
R
Tsui
Y Y
YY
Wei
M S
MS
Van Woerkom
L D
LD
Mackinnon
A J
AJ