The role of the temperature anisotropy in the deuterium-tritium fuel ignition under the effect of relativistic shock waves

Khodadadi Azadboni, Fatemeh; Khademloo, Elham; Mahdavi, Mohammad

doi:10.47176/ijpr.23.3.81746

The role of the temperature anisotropy in the deuterium-tritium fuel ignition under the effect of relativistic shock waves

Document Type : Original Article

Authors

Fatemeh Khodadadi Azadboni ¹

Elham Khademloo ²

Mohammad Mahdavi ²

¹ Department of Physics Education, Farhangian University, P.O. Box 14665-889, Tehran, Iran

² Department of Nuclear Physics, Faculty of Basic Sciences, University of Mazandaran, P.O. Box 47415-416, Babolsar, Iran

https://doi.org/10.47176/ijpr.23.3.81746

Abstract

This paper investigates the influence of temperature anisotropy on the ignition criterion of deuterium-tritium fuel in fast ignition fusion schemes that rely on short-pulse lasers-generated shock waves. The results show that increasing the temperature anisotropy parameter, β = T_⊥/T_∥, unexpectedly increases the fraction of alpha particles created and deposited into the ignition domain. For β < 1, the maximum confinement parameter remains below 4 g/cm², whereas for β > 1, it exceeds 4 g/cm². The fusion energy fraction, f_α, decreases throughout the laser pulse irradiation of the fuel (1 picosecond). A 100-fold increase in the temperature anisotropy parameter, β, leads to a 38% increase in the required plasma density times the hot spot dimension for fuel ignition. However, for β less than 1, the fusion energy fraction deposited decreases with time and reaches its minimum value of about 0.1 at the end of the laser pulse.

Keywords

deuterium-tritium fuel

fast ignition

ignition criterion

temperature anisotropy

Subjects

Nuclear Physics

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