Inverse Braking Radiation and Resonance Absorption in Corona Plasmas of Inertial Confinement Fusion

Subject Areas : Journal of Optoelectronical Nanostructures

Ebrahim Heidari ¹ , حیدر ایزدنشان ² , Mohammad Kouhi ³

1 - Department of Sciences, Bushehr Branch, Islamic Azad University, Bushehr, Iran
2 - عضو هیات علمی دانشگاه آزاد اسلامی واحد مرودشت
3 - Department of physics, Islamic Azad University, Tabriz Branch, Tabriz

Received: 2019-08-01 Accepted : 2020-04-22 Published : 2020-02-01

Keywords: Bremsstrahlung, Corona Plasma, Resonance Absorption, Laser Fusion,

Abstract :

Abstract: In this paper, combining the Maxwell equations with the electron balance
equation, we obtain the inverse braking radiation absorption coefficient in a laser fusion
corona plasma. For a fixed plasma temperature, variations of the absorption coefficient
versus the penetration depth into the plasma are illustrated numerically for different
values of laser wavelength. It is shown that, by increasing the skin depth of the laser
into the plasma, the absorption coefficient increases and tends to asymptotic value one.
The effect of plasma temperature on the absorption coefficient has also been
investigated. In addition, the fraction of absorbed energy for resonance absorption is
studied analytically and illustrated numerically. Moreover, the fractional absorption for
different laser wavelengths as well as different values of incident angle is illustrated. It
can be seen that, the maximum value of the absorption coefficient is independent of the
laser wavelength and is about 0.6 for all the wavelengths.

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