Implosion and core heating requirements in subignition experiments FIREX-I

In the fast ignition realization experiment project phase-I (FIREX-I) [H. Azechi and the FIREX Project, Plasma Phys. Control. Fusion 48, B267 (2006)], core heating up to an ion temperature of 5 keV is expected for subignition-class carbon-deuterium (CD) and deuterium-tritium (DT) fuels. The dependen...

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Veröffentlicht in:Physics of plasmas 2008-06, Vol.15 (6), p.062702-062702-7
Hauptverfasser: Johzaki, Tomoyuki, Nakao, Yasuyuki, Mima, Kunioki
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Sprache:eng
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Zusammenfassung:In the fast ignition realization experiment project phase-I (FIREX-I) [H. Azechi and the FIREX Project, Plasma Phys. Control. Fusion 48, B267 (2006)], core heating up to an ion temperature of 5 keV is expected for subignition-class carbon-deuterium (CD) and deuterium-tritium (DT) fuels. The dependence of the achieved ion temperature on heating pulse parameters, and core density is investigated using two-dimensional simulations. Since the core size in FIREX-I is insufficient for self-ignition, and the confinement time is comparable to the heating duration ( ∼ 10 ps ) , the temperature relaxation between the bulk electrons and ions is important for efficient ion heating. High compression (a core density of ρ > 200 g ∕ cm 3 ) is required for pure DT fuel to shorten the relaxation time. In this case, a heating energy of E h > 2 kJ and a duration of τ h < 10 ps are required to achieve an ion temperature of 5 keV . For CD and DT + foam fuels, the requirement for implosion is relaxed since the relaxation is fast, due to a large effective charge; 5 keV ion heating is achieved at ρ ⩾ 50 g ∕ cm 3 with E h > 2 kJ and τ h ∼ 10 ps .
ISSN:1070-664X
1089-7674
DOI:10.1063/1.2926631