  Relativistic temperature electrons higher than 0.5 MeV are generated
typically with laser intensities of about 10$^{18}$ W/cm$^{2}$. Their
generation with high repetition rate lasers that operate at non-relativistic
intensities ($\simeq$10$^{16}$ W/cm$^{2}$) is cardinal for the realization of
compact, ultra-short, bench-top electron sources. New strategies, capable of
exploiting different aspects of laser-plasma interaction, are necessary for
reducing the required intensity. We report here, a novel technique of dynamic
target structuring of microdroplets, capable of generating 200 keV and 1 MeV
electron temperatures at 1/100th of the intensity required by ponderomotive
scaling($10^{18}$ W/cm$^2$) to generate relativistic electron temperature.
Combining the concepts of pre-plasma tailoring, optimized scale length and
micro-optics, this method achieves two-plasmon decay boosted electron
acceleration with "non-ideal" ultrashort (25 fs) pulses at $4\times10^{16}$
W/cm$^2$, only. With shot repeatability at kHz, this precise in-situ targetry
produces directed, imaging quality beam-like electron emission up to 6 MeV with
milli-joule class lasers, that can be transformational for time-resolved,
microscopic studies in all fields of science.
