Fig. 1. Schematics of capsules with different radii: (a) 2 mm; (b) 2.5 mm; (c) 3 mm.

Fig. 2. (a) Implosion flow plot with scaled radiation temperature profile and scaled fusion power. (b) Flow plot near stagnation. (c) Fusion power waveform. The driven radiation temperature profile T_r(t) and the fusion power profile P_f(t) in (a) are both scaled to have a maximum value of 2.5.

Fig. 3. Evolutions of (a) kinetic energies and (b) total energies of different layers. The total energy is the sum of the internal energy and kinetic energy.

Fig. 4. Power analysis for the DT fuel region (a) over a long time span and (b) near the ignition time, and (c) time-integrated power curve. The surface power loss is defined as the sum of all the conductive power losses, namely, the radiative loss, electronic conductive loss, and ionic conductive loss. Negative work loss indicates fuel heating, and positive work loss indicates fuel cooling.

Fig. 5. Radial distributions of fuel densities, pressures, and ion temperatures at five different times around ignition.

Fig. 6. Cross-sectional schematic of the ZPDH load (left), and the input drive current profile (right).

Fig. 7. Density distributions of the ZPDH plasma at 393.3 and 394.5 ns. In the enlarged panels, the black solid line indicates the fuel–pusher interface, and the blue dashed circle indicates a sphere of the same radius.

Fig. 8. Radiation temperature profiles at two different positions on the capsule surface. The red solid line indicates the equatorial radiation temperature profile, and the blue dotted line indicates the polar radiation temperature profile.

Fig. 9. Influence of the radiation temperature profile characteristics on the fusion energy yields (in MJ) with the 2.5 mm-radius double-shell capsule.

Fig. 10. Sensitivities of fusion energy yield to (a) ablator thickness, (b) pusher thickness, (c) fuel density, and (d) cushion density.

Fig. 11. (a) Implosion flow plot of the double-shell capsule surrounded by CH foam with density 50 mg/cm³. (b) Corresponding fusion power released.

Table 1. Main features of the three double-shell capsules.

Table 2. Maximum energy absorbed by the capsule E_abs,capsule, maximum kinetic energy of the pusher layer E_k,pusher, and maximum internal energy of the DT fuel E_i,fuel for different peak values or different FWHM of the driven radiation temperature profile with a Gaussian shape. In the calculation, the fusion process is switched off.

Table 3. Maximum energy absorbed by the capsule E_abs,capsule, maximum kinetic energy of the pusher layer E_k,pusher, and maximum internal energy of the DT fuel E_i,fuel when the capsule parameters deviate from those shown in Fig. 1(b). The driven radiation takes the form given in Eq. (1), and the fusion process is switched off.