Page 429 - High Power Laser Handbook

396 So l i d - S t at e La s e r s The National Ignition Facility Laser 397

3v Laser Single Bundle
Parameter PCC (in context) Achieved Values Shot Number
Pulse energy ≥75 kJ 78 kJ for 8 beams N081010-002-999
FNE 1.87 MJ
Peak power ≥21 TW 21.3 TW N081011-001-999
511 TW FNE
Wavelength 0.35 μm 0.35 μm Entire campaign
Positioning <100 μm RMS 70 μm RMS N081205-001-999
accuracy 61 μm RMS N090114-002-999
Pulse duration Up to 20 ns Up to 21 ns N081102-002-999
Pulse dynamic ≥50:1 >90:1 N081011-001-999
range
Pulse spot size ≤600 μm 500 TW in 330 μm N060329-002-999
530 TW in 600 μm (B318 on PDS)
6
2
6
Prepulse power <4 × 10 W/cm 2 <10 ω/cm , Many
Measured at PAM
or 1ω main laser
output, analysis
to TCC
Cycle time 8 hours max 4:15 hours N081013-003-999
between full between shots N081014-001-999
system shots (Two Rev 3.1
Be shots)

Table 14.7 Comparison of Single-Bundle Performance with PCC Single-Bundle
Requirements. The Shot Numbers Encode the Shot Date (N081102 = November 11,
2008), Sequence Number (002 Means the Second Shot Fired That Day), And a
Code (999) That Signifies a Full-System Shot.

of these results, Fig. 14.36 is an x-ray framing camera image of an
imploded 1-mm-radius gas-filled capsule. Linear compression of
about 20 times is seen, with spherical contour maintained to within
~15 percent. Prior to the onset of the implosion campaign, theory and
modeling had predicted that stimulated scattering in the laser
entrance hole would act to transfer energy between the inner-cone
(low angle) and outer-cone (high angle) beamlines and that this effect
would be sensitive to the wavelength separation between the two
sets. Experiments have confirmed this effect and have demonstrated
57
that the imploded contour can be tuned predictably from oblate to
58
round to prolate by modifying the wavelength separation.
On December 4 and 5 of 2009, NIF fired 192-beam shots of 1.04
and 1.2 MJ into gas-filled hohlraums with gas-filled capsules. These
shots were part of a series that established that laser light can be effi-
ciently coupled into the hohlraum (90 percent or better coupling into