K(alpha) fluorescence measurement of relativistic electron transport in the context of fast ignition.
Electron transport within solid targets, irradiated by a high-intensity short-pulse laser, has been measured by imaging K(alpha) radiation from high- Z layers (Cu, Ti) buried in low- Z (CH, Al) foils. Although the laser spot is approximately 10 microm [full width at half maximum (FWHM)], the electron beam spreads to > or =70 microm FWHM within <20 microm of penetration into an Al target then, at depths >100 microm, diverges with a 40 degree spreading angle. Monte Carlo and analytic models are compared to our data. We find that a Monte Carlo model with a heuristic model for the electron injection gives a reasonable fit with our data.
Stephens
R B
RB
General Atomics, San Diego, California 92186, USA.
Snavely
R A
RA
Aglitskiy
Y
Y
Amiranoff
F
F
Andersen
C
C
Batani
D
D
Baton
S D
SD
Cowan
T
T
Freeman
R R
RR
Hall
T
T
Hatchett
S P
SP
Hill
J M
JM
Key
M H
MH
King
J A
JA
Koch
J A
JA
Koenig
M
M
MacKinnon
A J
AJ
Lancaster
K L
KL
Martinolli
E
E
Norreys
P
P
Perelli-Cippo
E
E
Rabec Le Gloahec
M
M
Rousseaux
C
C
Santos
J J
JJ
Scianitti
F
F