fast-ignition fuel-assembly: theory and experiments r. betti, c.d. zhou, w. theobald k. anderson, a....
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Fast-Ignition Fuel-Assembly:Theory and Experiments
R. Betti, C.D. Zhou, W. TheobaldK. Anderson, A. Solodov
Laboratory for Laser Energetics5th Fusion Science Center Meeting
February 28, Chicago, IL
FSC
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C. Zhou, W. Theobald, R. Betti, P.B. Radha, V. Smalyuk, C.K.Li et al, Phys. Rev. Lett. 98: 025004 (2007)
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Arb
itra
ry u
nit
s
Energy (MeV)
4 6 8 10 12 14 16 18 200
The maximum R during the burn can be inferredfrom the downshift of the tail of the primary proton spectrum for targets with a 25 atm D-He3 fill
5MeV 14.7MeVBirth energy
9.7MeV E -1.5MeV *broadening =8.2 MeV downshift
2burnmax 0.25g/cmρR
DHe3 Primary Proton spectrum
Fit ofspectrum
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The areal density is measured during the burn.Protons from secondary D-3He reactions are slowed down by the shell areal density
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C. Zhou, W. Theobald, R. Betti, P.B. Radha, V. Smalyuk, C.K.Li et al, Phys. Rev. Lett. 98: 025004 (2007)
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C. Zhou, W. Theobald, R. Betti, P.B. Radha, V. Smalyuk, C.K.Li et al, PRL98: 025004 (2007)
DHe3 Secondary Proton spectrum
Reconstructedspectra
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A complete set of hydro-scaling relations is derivedfor fast-ignition target design
C.D. Zhou and R. Betti, submitted to Phys. Plasmas
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1.85
0.9 7
345( )
3 10iVP Gbar
Slow implosions lead to a low pressure, low temperature fuel assembly optimal for cone-in-shell targets
FSC1.25
0.15 7
3( )
3 10iVT keV
Next step: slow implosions of cone-in-shell targets