For calculating the growth rates of different instabilities in Laser Produced Plasma, we need density scale length. Is it the "electron density scale length"? Because, in LPP, the electron density variations depends on dynamical as well as other atomic processes inside the plasma. So, we need to take ion density or density of atoms for the calculation of instability or electron density can be used?
For short laser pulse produced plasma, density scale length is given by product of ion acoustic speed and laser time duration. However for long laser pulse produced plasma it is equal to the effective radius of curvature of plasma due to irradiation or plasma geometry. In planar geometry it is equal to 2R (laser focal spot). In spherical geometry it is radius of sphere.
You can use ion density. Usually it is considered that ion and electron density is equal in plasma.
Dear Dr VN Rai,
Thanks a lot sir. Can I consider LPP produced from ns laser can be treated as "short laser produced plasma"?
If possible kindly suggest reference regarding the above information of density scale length. Thank you.
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