Direct-drive laser target designs for sub-megajoule energies

2007 ◽  
Vol 14 (5) ◽  
pp. 056317 ◽  
Author(s):  
D. G. Colombant ◽  
A. J. Schmitt ◽  
S. P. Obenschain ◽  
S. T. Zalesak ◽  
A. L. Velikovich ◽  
...  
Keyword(s):  
Direct Drive ◽  
Laser Target ◽  
Drive Laser

Effects of radiation on direct-drive laser fusion targets

2000 ◽  
Vol 7 (5) ◽  
pp. 2046-2054 ◽  
Author(s):  
D. G. Colombant ◽  
S. E. Bodner ◽  
A. J. Schmitt ◽  
M. Klapisch ◽  
J. H. Gardner ◽  
...  
Keyword(s):  
Laser Fusion ◽  
Direct Drive ◽  
Effects Of Radiation ◽  
Drive Laser

A Near Symmetrically Illuminated Direct Drive Laser Fusion Power Reactor - SIRIUS-P

1994 ◽  
Vol 26 (3P2) ◽  
pp. 868-872 ◽  
Author(s):  
I. N. Sviatoslavsky ◽  
G. L. Kulcinski ◽  
G. A. Moses ◽  
D. Bruggink ◽  
R. L. Engelstad ◽  
...  
Keyword(s):  
Power Reactor ◽  
Laser Fusion ◽  
Direct Drive ◽  
Fusion Power ◽  
Drive Laser

scholarly journals Single event laser fusion using ns-MJ laser pulses

2005 ◽  
Vol 23 (4) ◽  
pp. 453-460 ◽  
Author(s):  
GEORGE H. MILEY ◽  
H. HORA ◽  
F. OSMAN ◽  
P. EVANS ◽  
P. TOUPS
Keyword(s):  
Fusion Reaction ◽  
Laser Pulses ◽  
Laser Fusion ◽  
Detailed Knowledge ◽  
Single Event ◽  
Direct Drive ◽  
Laser Target ◽  
Laser Systems ◽  
Near Term ◽  
Volume Ignition

Studies of single-event laser-target interaction for fusion reaction schemes leading to volume ignition are discussed. Conditions were explored where single-event ns-laser pulses give rise to temperatures sufficient for volume ignition. Thus, ignition is possible, particularly if X-ray reabsorption is sufficiently high. Unfortunately, this scheme requires laser pulses with energies above 5 MJ and target densities of compressed DT above 1000 g/cm−3. Both requirements are quite demanding for near term systems. Nevertheless the present state technology and the detailed knowledge about volume ignition at direct drive are a basis. Systems as NIF or LMJ can well confirm these physics-clarified conditions and the technology for large laser systems with sufficient repetition rate and for a drastic reduction of the size and costs is necessary and possible and by physics similar to the known reductions in transistor development.

Sub-mega joule laser target designs for direct-drive ignition and moderate gains

2006 ◽  
Vol 47 (1) ◽  
pp. 17-22 ◽  
Author(s):  
D.G Colombant ◽  
S.P Obenschain
Keyword(s):  
Direct Drive ◽  
Laser Target

Controllable focal spot for direct-drive laser fusion based on electro-optic effect

2014 ◽  
Author(s):  
Zheqiang Zhong ◽  
Xiaochun Hu ◽  
Zelong Li ◽  
Rong Ye ◽  
Bin Zhang
Keyword(s):  
Focal Spot ◽  
Laser Fusion ◽  
Direct Drive ◽  
Electro Optic ◽  
Drive Laser

scholarly journals Progress in direct-drive fusion studies for the Laser Mégajoule

2004 ◽  
Vol 22 (2) ◽  
pp. 109-114 ◽  
Author(s):  
B. CANAUD ◽  
X. FORTIN ◽  
F. GARAUDE ◽  
C. MEYER ◽  
F. PHILIPPE
Keyword(s):  
Recent Progress ◽  
Coupling Efficiency ◽  
Direct Drive ◽  
Time Analysis ◽  
Laser Target ◽  
Long Wavelength ◽  
Laser Driver ◽  
Indirect Drive ◽  
Ice Shell ◽  
Target Design

In the context of the French Laser Mégajoule (LMJ) fusion research program, direct drive is an alternate to indirect drive to reach ignition and thermonuclear burn. We present recent progress in the direct-drive fusion studies for LMJ. Calculations have shown that the LMJ irradiation uniformity is characterized by long wavelength asymmetries compatible with direct drive requirements. Calculations of the irradiation uniformity in the context of indirect drive beam positioning have been done. We show that non-uniformity can be minimized by repointing the beams. Unfortunately, a time analysis shows that this nonuniformity increases strongly in time above levels usually considered inconsistent for direct drive. Finally, a recent baseline target design is presented and consists of a DT ice shell surrounded by a low-density CH foam wicked with cryogenic DT. This design can potentially reach a gain of 90 with a 1-MJ on-target laser driver. Hydrodynamic stability is increased at the ablation front and the laser–target coupling efficiency achieves 85%.

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