Plasma density multiplied by velocity gives ion flux, but the velocity consideration should be the plasma jet velocity (calculated from doppler shift) or the ion thermal velocity (depends on the plasma temperature). Kindly suggest me...
I would say this depends on a few factors. First, what type of plasma as you looking at? Is it one with flowing gas? What pressure are you operating at? Also, which of the two parameters you list (Doppler shift vs plasma temp) are you best able to measure? If you can measure both parameters, I would calculate them both to see how they compare. Otherwise, knowing more about your plasma might let me make some better suggestions.
If you are looking at a beam and you want to calculate the current density of this beam, you have to consider the beam velocity as the thermal velocity is per definition the velocity of random particle movement (otherwise you cannot have a real physical temperature connected to it, just a temperature equivalent).
Btw. to be precise, the ion flux or current density is j = q * ni *vi
where q is the charge of your ions, note that q is not necessarily 1 all the time!
First of all thanks to all.. our plasma is thermal expanding plasma confined by magnetic field with background pressure of 1-2 Pascal. We can calculate both jet velocity and temperature from optical emission spectroscopy (OES). Ion thermal velocity was calculated by putting the temperature from OES and jet velocity from doppler shift (for the present case we have not calculated). For your kind convenience I have attached one small OES report.
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