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Volumn 18, Issue 5, 2011, Pages

Point design targets, specifications, and requirements for the 2010 ignition campaign on the National Ignition Facility

(42)  Haan, S W a   Lindl, J D a   Callahan, D A a   Clark, D S a   Salmonson, J D a   Hammel, B A a   Atherton, L J a   Cook, R C a   Edwards, M J a   Glenzer, S a   Hamza, A V a   Hatchett, S P a   Herrmann, M C b   Hinkel, D E a   Ho, D D a   Huang, H c   Jones, O S a   Kline, J d   Kyrala, G d   Landen, O L a   more..


Author keywords

[No Author keywords available]

Indexed keywords

ABLATORS; D-T FUSION; EXPERIMENTAL CAMPAIGN; EXPERIMENTAL CONDITIONS; EXPERIMENTAL VALIDATIONS; GE-DOPING; HOHLRAUMS; HYDRODYNAMIC INSTABILITIES; IGNITION THRESHOLD; LASER OPERATIONS; LASER-PLASMA INTERACTIONS; NATIONAL IGNITION FACILITY; POINT DESIGN; RADIATION TEMPERATURE; SIMULATION TECHNIQUE; TARGET FABRICATION;

EID: 79958845375     PISSN: 1070664X     EISSN: None     Source Type: Journal    
DOI: 10.1063/1.3592169     Document Type: Article
Times cited : (646)

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    • 0 would vary as approximately the 2.7 power of the drive temperature.We present Be ablator designs at two different radiation temperatures, and their performance is qualitatively consistent with this expectation, but those designs have been independently optimized. We have not done systematic variations in drive temperature for our ignition designs to determine the generality of the pressure term in the Herrmann formalism. Our use of the formalism is independent of that possible generalization. 10.1063/1.369702
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    • Another definition of adiabat common in the literature (e.g., Ref.) is the minimum of the pressure in the fuel at peak velocity divided by the pressure in Fermi degenerate fully ionized DT at the same density. We do not use that definition for several reasons. First, at densities typical of peak velocity, the DT is only partially ionized and the actual minimum pressure is about a factor of 2 below the Fermi formula. Hence a low-adiabat implosion, at peak velocity, would be quoted as having pressure below Fermi degenerate- less than unity. We prefer a definition in which an adiabat of unity has the expected absolute meaning, that is, unity adiabat is essentially full Fermi degeneracy. Also, we use the mass-weighted average entropy rather than the minimum to capture approximately the overall average adiabat. Yet another option would be to use a post-stagnation adiabat. We use in-flight adiabat because it is more directly connected to input variables and is not coupled to velocity as a post-stagnation adiabat would be. Finally, we do not quote the numbers for entropy per se from our EOS model, because the numbers vary somewhat with EOS model depending on how the model defines entropy; the prescription described above can be used with any EOS model that has accurate isentropes and an accurate Pcold, and should not depend on incidental details of the EOS model. 10.1063/1.369702
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    • As noted above, there is a significant modeling uncertainty in the nonLTE radiation from Ge as it affects ITF via Eq.. This is treated as described just below Eq.. 10.1063/1.369702
    • As noted above, there is a significant modeling uncertainty in the nonLTE radiation from Ge as it affects ITF via Eq.. This is treated as described just below Eq.. 10.1063/1.369702
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    • Hot electrons can also affect the shock timing if enough energy is deposited in the ablator at an inauspicious time. This possible impact will be constrained by hot electron measurements with the truncated pulses used for shock-timing experiments and is currently a negligible issue in our margins and uncertainties rollup. A commissioning shot in August 2010 indicated few enough hot electrons to provide preliminary validation of this assumption, although further experimental verification is required. 10.1063/1.369702


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.