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Effects of beam radius and wobbling frequency on the uniformity of target implosion in direct-drive heavy ion fusion approach

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Abstract

In the field of inertial confinement fusion, non-uniform illumination of beams is a significant factor contributing to the non-uniform implosion of the target. Researchers have shown interest in direct-drive heavy ion beams due to their high efficiency in accelerating particles. To ensure the consistent operation of fusion reactors, it is essential to achieve robustness in target implosion. As a proposed solution, this paper investigates the impact of beam radius variation and wobbling frequency on target gain in heavy ion beam illumination. The study specifically examines the effects of beam radius variation and wobbling frequency on target gain. In one case, the wobbling frequency is set at 438 MHz, and the pulse radius is increased from 3.8 to 4.2 mm. The investigation involves analyzing the evolution of RMS nonuniformity in target layers. The results indicate that although increasing the beam radius leads to a slight rise in energy deposition non-uniformity, it still results in an overall increase in target gain of approximately 13%. Additionally, calculations are conducted for a wobbling frequency of 453 MHz. The findings demonstrate that increasing the beam radius from 3.8 to 4 mm, similar to the previous case, increases the target gain by approximately 7%. However, further increasing the radius to 4.2 mm causes a decrease in target gain due to the misalignment of a fraction of the heavy ion beam particles with the target. These results suggest that adjusting the beam radius and wobbling frequency can have a notable impact on target gain in heavy ion beam illumination. By carefully selecting these parameters, it is possible to enhance target implosion uniformity and improve fusion performance. The findings presented in this paper contribute to the understanding of beam-target interactions in inertial confinement fusion and offer insights for optimizing heavy ion beam illumination techniques in future fusion experiments.

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Authors and Affiliations

  1. School of Physics, Damghan University, Damghan, Semnan, 36716-41167, Iran

    Ahmad Naghidokht & Babak Khanbabaei

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  1. Ahmad Naghidokht
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  2. Babak Khanbabaei
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Correspondence to Babak Khanbabaei.

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Naghidokht, A., Khanbabaei, B. Effects of beam radius and wobbling frequency on the uniformity of target implosion in direct-drive heavy ion fusion approach. Indian J Phys 98, 327–337 (2024). https://doi.org/10.1007/s12648-023-02827-4

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