Zobrazeno 1 - 10
of 102
pro vyhledávání: '"van Veldhuizen, E. M."'
Autor:
Carbone, E. A. D., Hübner, S., van Veldhuizen, E. M., Schrader, A., Nijdam, S., Kroesen, G. M. W.
A coaxial microwave plasma setup was designed for investigation by optical and laser diagnostics. The plasma is sustained by two microwave power sources located at both ends of a coaxial line. This allows generating an axially homogeneous glow discha
Externí odkaz:
http://arxiv.org/abs/1407.8511
Publikováno v:
J. Phys. D: Appl. Phys. 45 (2012) 345201
In this contribution, nanosecond pulsed discharges in N$_{2}$ and N$_{2}$/0.9% H$_{2}$O at atmospheric pressure (at 300 K) are studied with time-resolved imaging, optical emission spectroscopy and Rayleigh scattering. A 170 ns high voltage pulse is a
Externí odkaz:
http://arxiv.org/abs/1403.5259
Publikováno v:
EPL (Europhysics Letters), 103 (2013) 25002
We investigate the branching of positive streamers in air and present the first systematic investigation of splitting into more than two branches. We study discharges in 100 mbar artificial air that is exposed to voltage pulses of 10 kV applied to a
Externí odkaz:
http://arxiv.org/abs/1305.1142
Publikováno v:
J. Phys. D: Appl. Phys. 44 455201 (2011)
Positive streamers need a source of free electrons ahead of them to propagate. A streamer can supply these electrons by itself through photo-ionization, or the electrons can be present due to external background ionization. Here we investigate the ef
Externí odkaz:
http://arxiv.org/abs/1108.1032
Publikováno v:
J. Phys. D: Appl. Phys. 43 (2010) 145204.
Positive streamers are thought to propagate by photo-ionization whose parameters depend on the nitrogen:oxygen ratio. Therefore we study streamers in nitrogen with 20%, 0.2% and 0.01% oxygen and in pure nitrogen, as well as in pure oxygen and argon.
Externí odkaz:
http://arxiv.org/abs/0912.0894
Publikováno v:
J. Phys. D: Appl. Phys. 2009 42 045201 (9pp)
Pictures show that streamer or sprite discharge channels emerging from the same electrode sometimes seem to reconnect or merge though their heads carry electric charge of the same polarity; one might therefore suspect that reconnections are an artifa
Externí odkaz:
http://arxiv.org/abs/0810.4443
Publikováno v:
Refereed Proceedings of the XVth Int. Conf. on Gas Discharges and Appl., Toulouse, France, Sept. 2004
This proceedings paper from 2004 contains figures of discharges in different gap lengths at the same potential that are not available elsewhere. The 2004 abstract: The evolution of streamers is known to depend on gas composition and electrode geometr
Externí odkaz:
http://arxiv.org/abs/0808.2426
Publikováno v:
J. Phys. D: Appl. Phys. 41 (2008) 234004
Positive and negative streamers are studied in ambient air at 1 bar; they emerge from a needle electrode placed 40 mm above a planar electrode. The amplitudes of the applied voltage pulses range from 5 to 96 kV; most pulses have rise times of 30 ns o
Externí odkaz:
http://arxiv.org/abs/0805.1376
Publikováno v:
J. Phys. D: Appl. Phys. 41 (2008) 234008
Positive streamers in ambient air at pressures from 0.013 to 1 bar are investigated experimentally. The voltage applied to the anode needle ranges from 5 to 45 kV, the discharge gap from 1 to 16 cm. Using a "slow" voltage rise time of 100 to 180 ns,
Externí odkaz:
http://arxiv.org/abs/0805.1364
Publikováno v:
Appl. Phys. Lett. 92, 101502 (2008)
Standard photographs of streamer discharges show a two-dimensional projection. We here present stereo-photographic images that resolve their three-dimensional structure. We describe the stereoscopic set-up and evaluation, and we present results for p
Externí odkaz:
http://arxiv.org/abs/0802.3639