Tetsuji Takeda's research while affiliated with Osaka University and other places
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Publications (2)
To create a conceptual design of a tracking system of a target injected into a wet-walled, laser-fusion reactor, the influence of residual gas on the target trajectory is discussed based on a kinetic model, assuming all of the impinging molecules are adsorbed on the target surface. The model targets are a high-gain target for central ignition and a...
A design space of the injection velocity of a cryogenic target for the vapor pressure in a future laser fusion reactor with a wet wall is discussed. The discussion includes gain reduction due to X-ray preheat, sphericity degradation, and melting of the cryogenic layer due to adsorption of the metal vapor in the reactor. The preliminary estimation i...
Citations
... Meanwhile, the vapor of the liquid metal exists as a residual gas. This residual gas acts as a frictional force on the target motion [15][16][17] and causes delay in the arrival time of the target [18,19]. Although the temperature and number density of the residual gas changes instantaneously with time after microexplosion, repetitive target injection is scheduled after steady state of the gas is realized in the reactor. ...
![[object Object]](https://i1.rgstatic.net/ii/profile.image/806156058492934-1569213990823_Q64/Taku-Yamanaka.jpg)
... The targets must survive both the acceleration forces of injection and the thermal load imposed by the fusion chamber. Target survival during injection has been studied previously for both direct drive [4][5][6][7][8][9][10][11][12][13][14][15][16] and indirect drive 17 targets in concept designs such as the SOMBRERO concept 18 and the High Average Power Laser (HAPL) program. 19 For direct drive targets (capsule only), the major structural concern is the thermomechanical distortion of plastic ablators 5 and the softer deuterium-tritium (DT) layer, which can lose strength as the target temperature increases during flight through the fusion chamber. ...
