Zobrazeno 1 - 10
of 186
pro vyhledávání: '"Martins J. L."'
High-intensity X-ray sources are invaluable tools, enabling experiments at the forefront of our understanding of materials science, chemistry, biology, and physics. Laser-plasma electron accelerators are sources of high-intensity X-rays, as electrons
Externí odkaz:
http://arxiv.org/abs/1810.06929
Autor:
Lemos, N., Martins, J. L., Tsung, F. S., Shaw, J. L., Marsh, K. A., Albert, F., Pollock, B. B., Joshi, C.
The development of a directional, small-divergence, and short-duration picosecond x-ray probe beam with an energy greater than 50 keV is desirable for high energy density science experiments. We therefore explore through particle-in-cell (PIC) comput
Externí odkaz:
http://arxiv.org/abs/1510.01029
An emissivity formula is derived using the generalised Fermi-Weizacker-Williams method of virtual photons which accounts for the recoil the charged particle experiences as it emits radiation. It is found that through this derivation the formula obtai
Externí odkaz:
http://arxiv.org/abs/1507.08607
It is shown through analytical modeling and numerical simulations that external magnetic fields can relax the self-trapping thresholds in plasma based accelerators. In addition, the transverse location where self-trapping occurs can be selected by ad
Externí odkaz:
http://arxiv.org/abs/1210.1947
Autor:
Kneip, S., McGuffey, C., Martins, J. L., Bloom, M. S., Chvykov, V., Dollar, F., Fonseca, R., Jolly, S., Kalintchenko, G., Krushelnick, K., Maksimchuk, A., Mangles, S. P. D., Najmudin, Z., Palmer, C. A. J., Phuoc, K. Ta, Schumaker, W., Silva, L. O., Vieira, J., Yanovsky, V., Thomas, A. G. R.
We propose and use a technique to measure the transverse emittance of a laser-wakefield accelerated beam of relativistic electrons. The technique is based on the simultaneous measurements of the electron beam divergence given by $v_{\perp}/v_{\parall
Externí odkaz:
http://arxiv.org/abs/1105.5559
Autor:
Kneip, S., McGuffey, C., Martins, J. L., Martins, S. F., Bellei, C., Chvykov, V., Dollar, F., Fonseca, R., Huntington, C., Kalintchenko, G., Maksimchuk, A., Mangles, S. P. D., Matsuoka, T., Nagel, S. R., Palmer, C., Schreiber, J., Phuoc, K. Ta, Thomas, A. G. R., Yanovsky, V., Silva, L. O., Krushelnick, K., Najmudin, Z.
Each successive generation of x-ray machines has opened up new frontiers in science, such as the first radiographs and the determination of the structure of DNA. State-of-the-art x-ray sources can now produce coherent high brightness keV x-rays and p
Externí odkaz:
http://arxiv.org/abs/0912.1812
Autor:
Peano, F., Martins, J. L., Fonseca, R. A., Peinetti, F., Mulas, R., Coppa, G., Last, I., Jortner, J., Silva, L. O.
The expansion of laser-irradiated clusters or nanodroplets depends strongly on the amount of energy delivered to the electrons and can be controlled by using appropriately shaped laser pulses. In this paper, a self-consistent kinetic model is used to
Externí odkaz:
http://arxiv.org/abs/0807.4125
The strong influence of the electron dynamics provides the possibility of controlling the expansion of laser-produced plasmas by appropriately shaping the laser pulse. A simple irradiation scheme is proposed to tailor the explosion of large deuterium
Externí odkaz:
http://arxiv.org/abs/physics/0701124
Publikováno v:
PHYSICAL REVIEW A 73, 053202 2006
The ion phase-space dynamics in the Coulomb explosion of very large ($\sim 10^6 - 10^7$ atoms) deuterium clusters can be tailored using two consecutive laser pulses with different intensities and an appropriate time delay. For suitable sets of laser
Externí odkaz:
http://arxiv.org/abs/physics/0604136