2023-04-01T02:02:28Z
https://oa.upm.es/cgi/oai2
oai:oa.upm.es:12578
2016-04-21T11:50:56Z
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Systematic Analysis of Direct-Drive Baseline Designs for Shock-Ignition with the Laser Megajoule
Brandon, V.
Canaud, B.
Laffite, S.
Temporal, Mauro
Ramis Abril, Rafael
Physics
Direct-drive inertial conﬁnement thermonuclear fusion consists in illuminating a shell of cryogenic Deuterium and Tritium (DT) mixture with many intense beams of laser light. Capsule is composed of DT gassurrounded by cryogenic DT as combustible fuel. Basic rules are used to deﬁne shell geometry from aspect ratio, fuel mass and layers densities. We deﬁne baseline designs using two aspect ratio (A=3 and A=5) who complete HiPER baseline design (A=7.7). Aspect ratio is deﬁned as the ratio of ice DT shell inner radius over DT shell thickness. Low aspect ratio improves hydrodynamics stabilities of imploding shell. Laser impulsion shape and ablator thickness are initially deﬁned by using Lindl (1995) pressure ablation and mass ablation formulae for direct-drive using CH layer as ablator. In ﬂight adiabat parameter is close to one during implosion. Velocitie simplosions chosen are between 260 km/s and 365 km/s. More than thousand calculations are realized for each aspect ratio in order to optimize the laser pulse shape. Calculations are performed using the one-dimensional version of the Lagrangian radiation hydrodynamics FCI2. We choose implosion velocities for each initial aspect ratio, and we compute scaled-target family curves for each one to ﬁnd self-ignition threshold. Then, we pick points on each curves that potentially product high thermonuclear gain and compute shock ignition in the context of Laser MegaJoule. This systematic analyze reveals many working points which complete previous studies ´allowing to highlight baseline designs, according to laser intensity and energy, combustible mass and initial aspect ratio to be relevant for Laser MegaJoule.
E.T.S.I. Aeronáuticos (UPM)
https://creativecommons.org/licenses/by-nc-nd/3.0/es/
2011
info:eu-repo/semantics/conferenceObject
Presentation at Congress or Conference
Proceedings of the 7th Conference on Inertial Fusion Sciences and Applications, IFSA 2011 | 7th Conference on Inertial Fusion Sciences and Applications, IFSA 2011 | 12/09/2011 - 16/09/2011 | Bordeaux-Lac, Francia
PeerReviewed
application/pdf
eng
http://www.ifsa11.org/
info:eu-repo/semantics/openAccess
https://oa.upm.es/12578/