Toshiki Tajima

Learn More
Could massive arrays of thousands of fibre lasers be the driving force behind next-generation particle accelerators? The International Coherent Amplification Network project believes so and is currently performing a feasibility study. T he challenge of producing the next generation of particle accelerators, for both fundamental research at laboratories such(More)
A cosmic acceleration mechanism is introduced which is based on the wakefields excited by the Alfvén shocks in a relativistically flowing plasma. We show that there exists a threshold condition for transparency below which the accelerating particle is collision-free and suffers little energy loss in the plasma medium. The stochastic encounters of the random(More)
This Article contains errors in Figure 3a and 3d where the y axes 'y (μ m)' is incorrectly given as 'y (mm)'. The correct Figure 3 appears below as Figure 1. This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article's Creative Commons license,(More)
The promising ability of a plasma wiggler based on laser wakefield acceleration to produce betatron X-rays with photon energies of a few keV to hundreds of keV and a peak brilliance of 10(22)-10(23) photons/s/mm(2)/mrad(2)/0.1%BW has been demonstrated, providing an alternative to large-scale synchrotron light sources. Most methods for generating betatron(More)
We present here designs for a staged implementation of an orbiting debris remediation system comprised of a super-wide field-of-view telescope (EUSO) and a novel high efficiency fibre-based laser system (CAN). Initial proof of concept stages will operate from the International Space Station (ISS) where the EUSO telescope has been designed for operation as a(More)
  • Mitsuru Yamagiwa, Sergei Bulanov, Timur Esirkepov, James Koga, Tomohito Otobe, Toshiki Tajima
  • 2007
We study laser-matter interactions numerically by using massively parallel computers. The ion acceleration from a double layer target driven by a laser pulse with intensities I = 10 20-10 22 W/cm 2 × (μm/λ) 2 is investigated via multi-parametric particle-in-cell (PIC) simulations. For targets over a wide range of thicknesses l and densities n e , at a given(More)
  • 1