Zobrazeno 1 - 10
of 38
pro vyhledávání: '"Greg Severn"'
Publikováno v:
Plasma Sources Science and Technology. 31:084003
Comparison between the Maxwell demon and a planar electrode has been revisited with an in-depth analysis of whether the angular momentum trap of the Maxwell demon indeed provides better energy selectivity than a small planar electrode that absorbs el
Publikováno v:
Plasma Sources Science and Technology. 31:024001
For unmagnetized low temperature Ar plasmas with plasma density ranging from 3 × 108 to 1010 cm−3 and an electron temperature of ∼1 eV, the expansion of the ion collecting area of a double-sided planar Langmuir probe with respect to probe bias i
Publikováno v:
Plasma Sources Science and Technology. 29:115021
Emission characteristics of a directly heated, rod-shaped LaB6 hot cathode has been studied in a multi-dipole confinement device. It is found that contrary to predictions from the conventional space-charge limited emission theory, emission current is
Publikováno v:
Plasma Sources Science and Technology. 29:025015
The plasma potential measured by cylindrical and planar Langmuir probes has been shown to differ from the plasma potential measured by emissive probes in the neighborhood of the presheath near a negatively biased electrode immersed in a weakly collis
Publikováno v:
Journal of Physics D: Applied Physics. 39:5230-5235
The Bohm sheath criterion in single- and two-ion species plasma is studied with laser-induced fluorescence using a diode laser. Xenon is added to a low pressure unmagnetized dc hot filament argon discharge confined by surface multidipole magnetic fie
Publikováno v:
Plasma Sources Science and Technology. 26:055021
Publikováno v:
2014 IEEE 41st International Conference on Plasma Sciences (ICOPS) held with 2014 IEEE International Conference on High-Power Particle Beams (BEAMS).
It is well established that when an electrode is biased negative with respect to the plasma potential, an ion sheath forms and when it is biased positive with respect to the plasma potential, an electron sheath forms provided that the electrode is sm
Publikováno v:
Plasma Sources Science and Technology. 26:015008
Axial ion motion in virtual cathodes and their connected presheaths are studied with laser-induced fluorescence. Virtual cathodes are formed using small electrodes (A electrode/A loss < 1.7(2.3 m e/m i)1/2) biased at higher than the plasma potential
Autor:
Greg Severn
Publikováno v:
American Journal of Physics. 75:92-94
The Bohm criterion is an inequality signifying that the ion flow speed at the plasma boundary must be at least as great as the ion sound speed in order for a sheath to form at the boundary. A physical explanation for this phenomenon is given, and the