Structure of direct-current microdischarge plasmas in helium

Kothnur, Prashanth S.; Yuan, Xiaohui; Raja, Laxminarayan L.
January 2003
Applied Physics Letters;1/27/2003, Vol. 82 Issue 4, p529
Academic Journal
A one-dimensional, self-consistent, continuum model is used to elucidate plasma phenomena in a parallel-plate dc microdischarge with a 250 µm gap at a pressure of 250 Torr. The microdischarge is found to have a bulk plasma region and a cathode sheath region with sizes that are comparable. Depending on the discharge current densities, peak electron densities of order up to 10[sup 14] cm[sup -3] are predicted. Electron temperature of several eV are predicted within the cathode sheath while temperatures between 2 and 3 eV are observed in the bulk plasma. Gas temperatures of the order of 1000 K are predicted, emphasizing the importance of gas heating phenomena in dc microdischarges.


Related Articles

  • Production and characterization of a fully ionized He plasma channel. Gaul, E. W.; Gaul, E.W.; Le Blanc, S. P.; Le Blanc, S.P.; Rundquist, A. R.; Rundquist, A.R.; Zgadzaj, R.; Langhoff, H.; Downer, M. C.; Downer, M.C. // Applied Physics Letters;12/18/2000, Vol. 77 Issue 25 

    We report guiding of intense (I=1.3±0.7x10[sup 17] W/cm[sup 2]) 80 fs laser pulses with negligible spectral distortion through 1.5-cm-long preformed helium plasma channels. Channels were formed by axicon-focused laser pulses of either 0.3 J energy, 100 ps duration, after preionizing a 200-700...

  • Impurity rotation in hydrogen and helium plasmas. Rowan, William L.; Meigs, A. G.; Hickok, R. L.; Schoch, P. M.; Yang, X. Z.; Zhang, B. Z. // Physics of Fluids B: Plasma Physics;Apr92, Vol. 4 Issue 4, p917 

    Rotation velocities were measured in two Ohmically heated discharges and compared to neoclassical predictions evaluated with measurements of Ti, ni, and Er. Hydrogen fueled one of the discharges, and helium was the principal fuel for the other. For both discharges, poloidal rotation is...

  • Field line resonances in a cylindrical plasma. Mitchell, C. C.; Maggs, J. E.; Gekelman, W. // Physics of Plasmas;Jul2002, Vol. 9 Issue 7, p2909 

    An experimental study of the response to an impulsive driver in a low beta helium plasma is presented. Field line resonance (FLR) spectra are recorded and compared to an ideal magnetohydrodynamic (MHD) theory with finite ion cyclotron frequency corrections. The agreement between observed and...

  • Laser-induced fluorescence study of discharge plasma in He+Xe mixture gas. Uchiike, Heiju; Shindo, Haruo; Nishi, Hiroshi; Arinaga, Kenji; Fukushima, Yoshifumi; Tamaru, Takeshi // Journal of Applied Physics;5/1/1987, Vol. 61 Issue 9, p4479 

    Investigates discharge plasma in helium + xenon mixture gas. Experimental apparatus and method; Information on fluorescene intensity and plasma parameters; Details on excitation mechanism and Penning type of collision.

  • Bipolar atmospheric-pressure corona discharge in a He/H[sub 2] mixture. Shuaibov, A. K. // Technical Physics;Jul99, Vol. 44 Issue 7, p767 

    Results are presented from a study of the characteristics of a steady-state plasma in a He/H[sub 2] mixture at high pressures. The plasma is formed in the outer region of a multielectrode corona discharge. It is shown that molecules of helium hydride form in such a medium, and their...

  • 10 BURNING FACTS About the SUN.  // Old Farmers Almanac for Kids;2007, Vol. 2, p36 

    The article presents facts about the Sun. The Sun is one of 100 billion stars in the Milky Way galaxy. Scientists estimate that the Sun is about 4.5 billion years old, or approximately halfway through its life cycle. The Sun is composed of plasma, a material made from electrically charged gas...

  • Optical Characteristics of the Plasma of a Glow Discharge in a He/H[sub 2]O Mixture. Shuaibov, A. K.; Shimon, L. L.; Dashchenko, A. I.; Shevera, I. V. // Plasma Physics Reports;Oct2001, Vol. 27 Issue 10, p897 

    The emission from the plasma of a steady-state electric discharge in a He/H[sub 2]O mixture in the wavelength range 130�670 nm is investigated. It is shown that, at a water vapor partial pressure of P = 2.0�2.5 kPa, the discharge mainly emits within the range 306�315 nm. The...

  • A comparison of particle in cell and fluid model simulations of low-pressure radio frequency discharges. Nitschke, T. E.; Graves, D. B. // Journal of Applied Physics;11/15/1994, Vol. 76 Issue 10, p5646 

    Deals with a study which compared particle-in-cell model and fluid model simulations of a radio frequency gaseous discharge containing a helium model gas. Model description; Results; Conclusions.

  • Pressure and helium mixing effects on plasma parameters in temperature control using a grid system. Bai, K. H.; Hong, J. I.; Chung, C. W.; Kim, S. S.; Chang, H. Y. // Physics of Plasmas;Jul2001, Vol. 8 Issue 7, p3498 

    Pressure and He mixing effects on plasma parameters in electron temperature control using a grid system are investigated. Electron temperature is higher in lower pressure, when the electron temperature is high and not controlled. Electron density can be increased by about three times by...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics