Observations of electromagnetic fields and plasma flow in hohlraums with proton radiography.
We report on the first proton radiography of laser-irradiated hohlraums. This experiment, with vacuum gold (Au) hohlraums, resulted in observations of self-generated magnetic fields with peak values approximately 10;{6} G. Time-gated radiographs of monoenergetic protons with discrete energies (15.0 and 3.3 MeV) reveal dynamic pictures of field structures and plasma flow. Near the end of the 1-ns laser drive, a stagnating Au plasma (approximately 10 mg cm;{-3}) forms at the center of the hohlraum. This is a consequence of supersonic, radially directed Au jets (approximately 1000 microm ns;{-1}, approximately Mach 4) that arise from the interaction of laser-driven plasma bubbles expanding into one another.
Li
C K
CK
Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
Séguin
F H
FH
Frenje
J A
JA
Petrasso
R D
RD
Amendt
P A
PA
Town
R P J
RP
Landen
O L
OL
Rygg
J R
JR
Betti
R
R
Knauer
J P
JP
Meyerhofer
D D
DD
Soures
J M
JM
Back
C A
CA
Kilkenny
J D
JD
Nikroo
A
A