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Plasma energy

by xhtp2000
Tags: energy, plasma
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xhtp2000
#1
Jul30-14, 10:21 AM
P: 18
What is the energy partition in the laser-induced plasma? Based on the atomic emission spectra from the plasma, we can infer the electron temperature and electron density from Boltzmann-plot and Stark broadening, I wonder how can I calculate the total energy in this plasma?
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mfb
#2
Jul30-14, 03:47 PM
Mentor
P: 12,081
What does "the laser-induced plasma" refer to? The "the" looks very specific.
I wonder how can I calculate the total energy in this plasma?
If the energy just comes from the laser pulse, you just have to measure your laser pulses.
samurai688
#3
Aug1-14, 12:02 PM
P: 1
If you've got the electron temperature and electron number density and you're assuming a maxwellian distribution, you can get the average energy = 3/2 kTe, (so for Te = 1 eV, average electron energy 1.5 eV). Then multiply by the number density and plasma volume to get a measure of the total energy in your electrons.

Depending on your device you may have gradients in the density or temperature, so you will want to use average values over the volume for a rough calculation.

Also you still have energy in the ions: the number density is likely the same as the electrons if it is quasineutral plasma, but the temperatures may be different depending on your device. And if not fully ionized, you've got neutrals.


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