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A novel ignition hohlraum named three-axis cylindrical hohlraum (TACH) isdesigned for indirect-drive inertial confinement fusion. TACH is a kind of 6laser entrance holes (LEHs) hohlraum, which is orthogonally jointed of threecylindrical hohlraums. The first experiment on the radiation field of TACH wasperformed on Shenguang III laser facility. 24 laser beams were elected andinjected into 6 LEHs quasi-symmetrically. Total laser energy was about 59 kJ,and the peak radiation temperature reached about 192 eV. Radiation temperatureand pinhole images in gas-filled hohlraum are largely identical but with minordifferences with those in vacuum hohlraum. All laser energy can be totallydelivered into hohlraum in 3 ns duration even without filled gas in thehohlraum of 1.4 mm diameter. Plasma filling cannot be obviously suppressed evenwith 0.5 atm pressure gas in the small hohlraum. Backscattering fractions ofvacuum hohlraum and gas-filled hohlraum are both lower than 2%. Experimentalstudy of this new kind of hohlraum can provide guidance for future targetdesign and implosion experiment.

First Investigation on the Radiation Field of the Gas-Filled Three-Axis Cylindrical Hohlraum