  Compared with the deuterium tritium (DT) fusion, the environmentally clean
fusion of protons with 11B is extremely difficult. When instead of nanosecond
laser pulses for thermal-ablating driven ignition, picosecond pulses are used,
a drastic change by nonlinearity results in ultrahigh acceleration of plasma
blocks. This radically changes to economic boron fusion by a measured new
avalanche ignition.
