Zobrazeno 1 - 10
of 130
pro vyhledávání: '"B. La Fontaine"'
Autor:
B. La Fontaine, P. Couture, F. Vidal, C. Y. Chien, P. Lalande, T. W. Johnston, A. Bondiou-Clergerie, F.A.M. Rizk, H. Pépin, D. Comtois, J. C. Kieffer, H. P. Mercure, I. Gallimberti, François Martin, C. Potvin
Publikováno v:
IEEE Transactions on Plasma Science. 31:377-386
Using a plasma channel produced by an ultrashort laser pulse, we have studied the laser triggering and guiding of a positive leader from the tip of a 2-m vertical rod standing on the bottom plane of a 7-m plane-plane gap. The purpose of this setup wa
Autor:
T. W. Johnston, J. C. Kieffer, I. Gallimberti, P. Lalande, F.A.M. Rizk, D. Comtois, H. Pépin, P. Couture, C. Y. Chien, B. La Fontaine, François Martin, C. Potvin, A. Bondiou-Clergerie, H.P. Mercure, F. Vidal
Publikováno v:
IEEE Transactions on Plasma Science. 31:387-395
We have used the Bondio-Gallimberti model of positive leader propagation to simulate laboratory experiments of laser triggering and guiding of upward leaders initiated from a ground rod. The model proves to be capable of reproducing all the important
Autor:
H. P. Mercure, A. Bondiou-Clergerie, B. La Fontaine, F. Vidal, J. C. Kieffer, F.A.M. Rizk, Henri Pépin, D. Comtois, T. W. Johnston, I. Gallimberti
Publikováno v:
IEEE Transactions on Plasma Science. 30:1339-1349
With the aim of elucidating the role of thermal effects in air in the leader propagation, the properties of the ionized air (charged species densities, electric field, and air temperature) in a limited region near the tip of the positive leader were
Autor:
J. C. Kieffer, I. Gallimberti, A. Bondiou-Clergerie, F.A.M. Rizk, C. Potvin, P. Couture, P. Lalande, T. W. Johnston, H. P. Mercure, A. Desparois, C. Y. Chien, F. Vidal, B. La Fontaine, François Martin, D. Comtois, Henri Pépin
Publikováno v:
Physics of Plasmas. 8:2532-2539
The triggering and guiding of leader discharges using a plasma channel created by a sub-joule ultrashort laser pulse have been studied in a megavolt large-scale electrode configuration (3–7 m rod-plane air gap). By focusing the laser close to the p
Autor:
D. Comtois, François Vidal, A. Desparois, A. Bondiou-Clergerie, T. W. Johnston, H. Pépin, H. P. Mercure, B. La Fontaine, F.A.M. Rizk, C. Y. Chien, J. C. Kieffer
Publikováno v:
IEEE Transactions on Plasma Science. 28:1755-1762
In an ongoing effort to understand how ultrashort pulse lasers can be used to trigger spark discharges in air over considerable distances at electric fields much below that of self-breakdown, we have studied the influence of the laser pulse energy on
Autor:
Kevin Baker, Brad W. Sleaford, Mukesh Prasad, David M. Villeneuve, R. P. Drake, Kent Estabrook, B. La Fontaine
Publikováno v:
Physics of Plasmas. 6:4284-4292
Thomson scattering was used to measure the spectrum of Langmuir waves, in both frequency and wave number, driven below quarter-critical density by a laser beam. These measurements were capable of detecting and identifying waves driven by stimulated R
Autor:
F.A.M. Rizk, C. Y. Chien, François Vidal, A. Desparois, H. P. Mercure, T. W. Johnston, H. Pépin, J. C. Kieffer, B. La Fontaine, D. Comtois
Publikováno v:
IEEE Transactions on Plasma Science. 27:688-700
In an ongoing program using ultrashort laser pulses to provoke discharges in air over considerable distances at electric fields below breakdown threshold, we have studied the conditions for the onset of streamers in such laser-produced plasmas, both
Autor:
H. P. Mercure, B. La Fontaine, François Vidal, C. Y. Chien, Jean-Claude Kieffer, T. W. Johnston, D. Comtois, Z. Jiang, Henri Pépin, A. Desparois
Publikováno v:
Physics of Plasmas. 6:1615-1621
The propagation of high-power short-pulse laser beams over considerable distances in air is studied both experimentally and via numerical simulations. Filaments are formed after 5–10 m and their propagation over distances in excess of 200 m is repo
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Autor:
B. La Fontaine, H. A. Baldis, Gary D. Enright, J. Dunn, Marc Nantel, J. C. Kieffer, David M. Villeneuve
Publikováno v:
Canadian Journal of Physics. 72:793-801
X-ray laser action has been studied in a laser-produced plasma composed of germanium atoms ionized to the neonlike state. Laser gains of up to 4.1 cm−1 at 232 Å (1 Å = 10−10 m) were measured. The effect of driver laser parameters such as intens