It has been demonstrated experimentally that laser plasma accelerators can produce multi-100 MeV electron bunches with a few percent energy spread, and from these electrons, multi-MeV quasi-monoenergetic photons have based on Compton up-scattering counter-propagating laser. This offers the potential of high-quality, narrow-bandwidth, compact, photon source broad application. The bandwidth resul...

It is shown that a gravitationally collapsing black hole acts as an ultrahigh energy particle accelerator that can accelerate particles to energies inconceivable in any terrestrial particle accelerator, and that when the energy E of the particles comprising the matter in the black hole is ∼ 10 GeV or more,or equivalently the temperature T is ∼ 10 K or more, the entire matter in the black hole w...

Laser–plasma acceleration at kilohertz repetition rates has recently been shown to work in two different regimes with pulse lengths of either 30 fs or 3.5 fs. We now report on a systematic study which large range durations and plasma densities were investigated through continuous tuning the laser spectral bandwidth. Indeed, laser–plasma accelerator (LPA) processes can be distinguished, where be...