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On the evaluation of ignition threshold in proton‐carbon hybrid ignitor beam proposal
Author(s) -
Mehrangiz M.,
Khoshbinfar S.
Publication year - 2020
Publication title -
contributions to plasma physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.531
H-Index - 47
eISSN - 1521-3986
pISSN - 0863-1042
DOI - 10.1002/ctpp.201900061
Subject(s) - ignitor , proton , beam (structure) , atomic physics , ignition system , plasma , ion , national ignition facility , materials science , acceleration , ion beam , inertial confinement fusion , physics , nuclear physics , optics , thermodynamics , classical mechanics , quantum mechanics
We may improve plasma ignition quality in a conically guided proton fast ignition scheme by the application of an extra lower intensity, secondary carbon beam. According to the experimental measurements on the number of laser‐accelerated ions, the temporal evolution of the hot spot electron, ion, and radiation temperatures was examined using three‐temperature plasma model, in radiation pressure acceleration (RPA) mechanisms for a proton‐Carbon beam configuration, E avg ≈ 10 MeV/nucleon. The hot spot ignition was evaluated by the well‐known stopping power models proposed independently by Li–Petrasso (LP) and Brown–Preston–Singleton (BPS). Based on our analytical results, with time, plasma temperature in the LP model surpasses the BPS model. From this point of view, to compensate this deficiency in the BPS method, we will show that the density ratio of 17% is required when the energy spread is 10%. The results were also validated by the DEIRA‐4 code. Moreover, the electron‐ion equilibrium will decrease up to 9.3 and 4.4% for the LP and BPS methods, respectively. It is demonstrated that the key features of a higher average ion energy as well as the narrow beam profile in the RPA regime may effectively ignite hot spot much better than in the Target Normal Sheath Acceleration (TNSA) counterpart. It is estimated that the proton‐Carbon beam proposal can reduce ion beam energy to 8.42 kJ, approximately saving 15% of ignitor energy.