Investigation of First Three-Axis Cylindrical Hohlraum Experiment on Shenguang III

A novel ignition hohlraum named three-axis cylindrical hohlraum (TACH) is designed for indirect-drive inertial confinement fusion. TACH is a kind of 6 laser entrance holes (LEHs) hohlraum, which has excellent radiation uniformity, low backscatter, acceptable energy efficiency and little predictable risk, and is a candidate of ignition hohlraum. The first experiment of TACH was performed on Shenguang III with the dimension Φ 1.4 mm × 3.2 mm. 24 laser beams with 3 ns duration were injected into with the approximate incident angle of 49.3 +/- 1.42. Total laser energy was about 59 kJ, and the peak of radiation temperature reached about 192 eV. Results showed plasma filling is not obviously suppressed even with 0.5 atm pressure gas in the small hohlraum. All laser energy can be totally delivered into hohlraum in 3 ns duration even without filled gas. Backscatter was less than 2%.

National Natural Science Foundation of China.