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The contents of the Electron temperature page were merged into Plasma parameters on 4 January 2020. For the contribution history and old versions of the redirected page, please see its history; for the discussion at that location, see its talk page. |
The contents of the Collisionality page were merged into Plasma parameters on 07 August 2018. For the contribution history and old versions of the redirected page, please see its history; for the discussion at that location, see its talk page. |
I would suggest adding Lundquist number and Magnetic Reynolds number -- Samoojas ( talk) 19:49, 1 July 2011 (UTC)
Would we also be able to add the strong coupling constant (not yet an article for it that I can find, but it is defined as the ratio of energy due to the electric field to thermal energy. NJHartley ( talk) 13:44, 19 July 2012 (UTC)
I think the "c" in the gyrofrequency shouldn't be there. But I don't know much about plasma physics. Someone please, confirm. — Preceding unsigned comment added by 129.123.154.253 ( talk) 01:36, 24 March 2014 (UTC)
The formula for this is off by 10,000, which looks like a flipped sign on the exponent of the constant up front (should be 1.02*10^-2), and/or it was checked in B units of Gauss rather than Tesla as I believe it should, under (coincidentally) Gaussian CGS units. I have not checked the rest of the page for the same error.
r_i = v_{Ti}/\omega_{ci} = 1.02\times10^2\,\mu^{1/2}Z^{-1}T_i^{1/2}B^{-1}\,\mbox{cm} — Preceding unsigned comment added by Pjwitham ( talk • contribs) 17:17, 27 August 2014 (UTC)
I would suggest adding a section with the conditions necessary for a plasma to be achieved. For example:
– Debye Length must me smaller than any typical length of the system, otherwise significant charge separations could arise and the plasma becomes dominated by some boundary effects
– Debye length must be statistically valid => there should be enough particles in a Debye Sphere: (where n is the average density of particles)
And some other relations. Heitorpb ( talk) 17:06, 17 October 2015 (UTC)
Considering that the Electron temperature article needs some help, and that the electron temperature is one of the most fundamental plasma parameters, maybe it could appear as a subsection in this plasma parameter article instead? -- AquaDTRS ( talk) 23:55, 4 September 2018 (UTC)
Most (or all?) of the formulas for the plasma parameters on this page have just been copied from the NRL plasma formulary. First of all, I think this should be mentioned more prominently, not just in the references section. Moreover, the cgs unit system used in the NRL formulary is outdated and should really no longer be used in physics articles. Many non-expert readers will not be familiar with conversion of units from the SI system to cgs. A non-expert might also not realize that electromagnetic quantities such as charge or magnetic induction not only have different values but also different dimensions in SI vs cgs unit systems. I would therefore suggest to convert all formulas to SI units except for the plasma temperature, which in plasma physics usually is expressed by its corresponding thermal energy in units of eV instead of k T (T in Kelvin, k the Boltzmann factor).
electron plasma frequency const factor is given as 5.64e4 . Using the Si units of electron mass, charge etc, one arrives at 5.64e2 * n_e^(1/2) 185.82.160.26 ( talk) 15:17, 18 August 2023 (UTC)
This article is rated Start-class on Wikipedia's
content assessment scale. It is of interest to the following WikiProjects: | |||||||||||
|
The contents of the Electron temperature page were merged into Plasma parameters on 4 January 2020. For the contribution history and old versions of the redirected page, please see its history; for the discussion at that location, see its talk page. |
The contents of the Collisionality page were merged into Plasma parameters on 07 August 2018. For the contribution history and old versions of the redirected page, please see its history; for the discussion at that location, see its talk page. |
I would suggest adding Lundquist number and Magnetic Reynolds number -- Samoojas ( talk) 19:49, 1 July 2011 (UTC)
Would we also be able to add the strong coupling constant (not yet an article for it that I can find, but it is defined as the ratio of energy due to the electric field to thermal energy. NJHartley ( talk) 13:44, 19 July 2012 (UTC)
I think the "c" in the gyrofrequency shouldn't be there. But I don't know much about plasma physics. Someone please, confirm. — Preceding unsigned comment added by 129.123.154.253 ( talk) 01:36, 24 March 2014 (UTC)
The formula for this is off by 10,000, which looks like a flipped sign on the exponent of the constant up front (should be 1.02*10^-2), and/or it was checked in B units of Gauss rather than Tesla as I believe it should, under (coincidentally) Gaussian CGS units. I have not checked the rest of the page for the same error.
r_i = v_{Ti}/\omega_{ci} = 1.02\times10^2\,\mu^{1/2}Z^{-1}T_i^{1/2}B^{-1}\,\mbox{cm} — Preceding unsigned comment added by Pjwitham ( talk • contribs) 17:17, 27 August 2014 (UTC)
I would suggest adding a section with the conditions necessary for a plasma to be achieved. For example:
– Debye Length must me smaller than any typical length of the system, otherwise significant charge separations could arise and the plasma becomes dominated by some boundary effects
– Debye length must be statistically valid => there should be enough particles in a Debye Sphere: (where n is the average density of particles)
And some other relations. Heitorpb ( talk) 17:06, 17 October 2015 (UTC)
Considering that the Electron temperature article needs some help, and that the electron temperature is one of the most fundamental plasma parameters, maybe it could appear as a subsection in this plasma parameter article instead? -- AquaDTRS ( talk) 23:55, 4 September 2018 (UTC)
Most (or all?) of the formulas for the plasma parameters on this page have just been copied from the NRL plasma formulary. First of all, I think this should be mentioned more prominently, not just in the references section. Moreover, the cgs unit system used in the NRL formulary is outdated and should really no longer be used in physics articles. Many non-expert readers will not be familiar with conversion of units from the SI system to cgs. A non-expert might also not realize that electromagnetic quantities such as charge or magnetic induction not only have different values but also different dimensions in SI vs cgs unit systems. I would therefore suggest to convert all formulas to SI units except for the plasma temperature, which in plasma physics usually is expressed by its corresponding thermal energy in units of eV instead of k T (T in Kelvin, k the Boltzmann factor).
electron plasma frequency const factor is given as 5.64e4 . Using the Si units of electron mass, charge etc, one arrives at 5.64e2 * n_e^(1/2) 185.82.160.26 ( talk) 15:17, 18 August 2023 (UTC)