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Study on propagation of temperature disturbance in indirect-drive inertial confinement cryogenic target system.

Number: pap. n. 36

Author(s) : LI C., LI Y., CHEN P., et al.

Summary

Sufficiently smooth ice layer inside the capsule is required for indirect-drive inertial confinement cryogenic target to achieve ignition, and this is considered to be affected by the thermal gradients around the outer surface of fuel capsule. A numerical investigation was conducted to examine the relation between the temperature disturbance on the cooling wall and the temperature distribution around the capsule surface, and was mostly concerned with periodic disturbance of cooling wall temperature. The effects of disturbance waveform such as sine, square and triangle, the disturbance frequency as well as the hohlraum gas composition are all investigated. The proposed numerical model is verified by a simplified cryogenic target, and the calculated temperature distribution around the capsule is in good agreement with the experimental data. The results indicate that amplitude attenuation is significant when the periodic disturbance propagates from the cooling wall to the hohlraum and to the capsule surface. For the three waveforms investigated in the present study, higher frequency results in larger attenuation of the disturbance amplitude. Square waveform temperature disturbance propagates faster and is more difficult to be attenuated when compared with sine form disturbance. The temperature fields inside the hohlraum and outside the capsule also demonstrate a dependence on the filling gas composition when the cooling wall temperature fluctuates, and higher proportion of H2 in the He-H2 mixture helps to suppress the propagation of disturbance.

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Details

  • Original title: Study on propagation of temperature disturbance in indirect-drive inertial confinement cryogenic target system.
  • Record ID : 30021709
  • Languages: English
  • Source: Cryogenics 2017. Proceedings of the 14th IIR International Conference: Dresden, Germany, Mai 15-19, 2017.
  • Publication date: 2017/05/15
  • DOI: http://dx.doi.org/10.18462/iir.cryo.2017.0036

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