  In laser-drive ICF, hybrid drive (HD) combined direct drive (DD) and indirect
drive (ID) offers a smoothed HD pressure $P_{HD}$, far higher than the ablation
pressure in ID and DD, to suppress hydrodynamic instabilities. In this letter,
simulations of a new robust HD ignition target show that maximal HD pressure as
high as $P_{HD} \sim$ 650 Mbar driven by a novel "bulldozer" effect is
achieved, resulting in nonstagnation hotspot ignition at the convergence ratio
$C_r \sim $23, and finally, fusion energy gain $\sim$ 10 in total laser energy
= 1.42 MJ. Two-dimensional simulations have confirmed that hydrodynamic
instabilities are suppressed. A well-fitted scale of maximal HD pressure
$P_{HD}$ (Mbar)= $BE_{DD}^{1/4} T_r$ is found from simulations of different
targets and laser energies as long as $T_r> 160$ eV, where B is the constant
depending on ablator materials, $E_{DD}$ in kJ is DD laser energy and $T_r$ in
100 eV is radiation temperature depending on ID laser energy $E_{ID}$.
$P_{HD}\geq$ 450 Mbar is requested for hotspot ignition. This scale from
"bulldozer" effect is also available as $E_{DD}$ is reduced to kJ. Experiments
have verified $P_{HD}$ about 3.5 times radiation ablation pressure for CH
ablator using $E_{ID}=43$ kJ ($T_r \simeq$200 eV) and $E_{DD}$=3.6 kJ, also
shown that both backscattering fraction and hot-electron energy fraction for DD
laser intensity $\sim 1.8 \times 10^{15} {\rm w\cdot cm^{-2}}$ are about a
third of the traditional DD laser-plasma interaction
