detector monoenergetic proton backlighting for studying field evolution and areal density in hedp r....
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Detector
Monoenergetic proton backlighting for studying field evolution and areal density in HEDP
R. D. Petrasso, MIT
3 MeV
0 5 10 15 20
MeV
Pro
ton
Yie
ld DD D3He
Detector
Detector
0.6 ns after laser on
15 MeVLaser
MITMIT
Summary
MIT NLUF radiographs show details of magnetic field structure and time evolution during and long after laser illumination.
Data and LASNEX are in general agreement with the laser on, but diverge afterwards
Monoenergetic proton backlighting is being used for studying field evolution and ρR in HEDP
Important opportunities exist for studying:
Imploded capsules Plasma plumes/jets Laser-hohlraum interactions Plasma stopping power
MITMIT
Collaborators
C. K. Li F. H. SéguinJ. A. FrenjeJ. R. Rygg
R. D. Petrasso
MIT
R. P. J. TownP. A. AmendtS. P. HatchettO. L. Landen
A. J. MackinnonP. K. PatelM. Tabak
LLNL
J. P. KnauerT. C. Sangster V. A. Smalyuk
LLE
0
5
0 5 10 15Energy (MeV)
Yie
ld /
Me
V (
X1
0 10)
D3He p(x100)
DDp
T3He D
( 100)
DT
Multiple mono-energetic particles can be matched to the fields and ρR of an HED experiment
OMEGA shot 14972
ρR : ~ 5 to ~ 300 mg/cm2
rgyro : differ by ~ X 5
A monoenergetic, isotropic source has been used for multiple, simultaneous experiments at OMEGA
mesh
“Backlighter”
Backlighter drive beams
CR-39
Interaction beam
CH foil
side-on
face-on
0.3 ns 0.6 ns 0.9 ns 1.2 ns 1.5 ns 1.8 ns 2.3 ns 3.0 ns
Submitted to PRL, Li et al.
DATA
Interaction laser on for 1 ns
Data and LASNEX are similar with the laser on, but diverge afterwards
LASNEX
0
250
0 1 2 3
Time (ns)
0
0.6
Bdℓ (MG-µm)
Laser power (TW)
Field amplitudes from data and LASNEX are similar with the laser on, but diverge afterwards
laser
LASNEX
data
After laser pulse, experimental magnetic diffusivity is larger than LASNEX
Future HED experiments will utilize monoenergetic, multiparticle, isotropic backlighters
Magnetized-Target fields and ρR
Fields and ρR in implosions – R. Kingham, CO3 :PDD
Fields of OMEGA-EP / NIF-ARC laser systems Fields in hohlraums
Fields and modulations in RT experiments
Plasma stopping power
Magnetized-Targetfields and ρR (Nov. 2006)*
D3He implosion proton backlighter
B 10 MG
Laser beams
Laser beams
APS talk by O. V. Gotchev et al., JO2.00012
B fields generated by a ring of beams around an Au tube(Feb. 2007, Fusion Science Center)
AuProtons
CH
Side view Top view
Fields generated by EP-plasma interactions
mesh
“Backlighter”
Backlighter drive beams
CR-39 detector
CH foil
OMEGA EP beam
We are proposing similar experiments for NIF-ARC.
Uniform plasma
Te ~ 50 eV
ne ~ 1023 /cc
~ 100 m
D3He implosion proton backlighter
Stopping power in dense, cold plasmas
Li et al., RSI (2006)
MITMIT
Summary
MIT NLUF radiographs show details of magnetic field structure and time evolution during and long after laser illumination.
Data and LASNEX are in general agreement with the laser on, but diverge afterwards
Monoenergetic proton backlighting is being used for studying field evolution and ρR in HEDP
Important opportunities exist for studying:
Imploded capsules Plasma plumes/jets Laser-hohlraum interactions Plasma stopping power
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