In what case can the plasma be treated as the ideal gas? The plasma, more specifically, is induced during a laser ablation event.
In what aspect you want to treat it as an ideal gas? - Usually a plasma cannot be treated as such at all because of the long range Coulomb interactions between the charged particles (an ideal gas, per definition, allows only for interactions via direct elastic collisions). However, some reasonable approximations can be made in some situations - for example, in certain plasmas you can treat the electrons or ions to be in a thermal equilibrium (a condition, which is actually based on the concept of an ideal gas normally) but, as I said, it depends very much on what physical aspect in your plasma you are looking at.
@Johannes Gruenwald
Thanks. I want to use a hydrodynamic simulation to calculate the pressure,density, and temperature of laser-induced plasma, as used in paper"Experimental and computational study of complex shockwave dynamics in laserablation plumes in argon atmosphere,http://scitation.aip.org/content/aip/journal/pop/19/8/10.1063/1.4745867".
OK, in such a case you should be fine with the ideal gas approach because you have high plasma densities (this leads to a high collisionality and to a short Debye length, so the Coulomb forces are shielded quite efficiently within your plasma volume).
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