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Plasma scale length and quantum electrodynamics effects on particle acceleration at extreme laser plasmas

Published online by Cambridge University Press:  15 November 2021

Ozgur Culfa Open the ORCID record for Ozgur Culfa [Opens in a new window]  and
Sinan Sagir Open the ORCID record for Sinan Sagir [Opens in a new window]
Ozgur Culfa*
Affiliation:
Department of Physics, Karamanoglu Mehmetbey University, Karaman 70200, Turkey
Sinan Sagir
Affiliation:
Vocational School of Health Services, Karamanoglu Mehmetbey University, Karaman, 70200, Turkey
*
†Email address for correspondence: ozgurculfa@kmu.edu.tr
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Abstract

In this work, simulations of multipetawatt lasers at irradiances ${\sim }10^{23} \ \mathrm {W}\ \mathrm {cm}^{-2}$, striking solid targets and implementing two-dimensional particle-in-cell code was used to study particle acceleration. Preformed plasma at the front surface of a solid target increases both the efficiency of particle acceleration and the reached maximum energy by the accelerated charged particles via nonlinear plasma processes. Here, we have investigated the preformed plasma scale length effects on particle acceleration in the presence and absence of nonlinear quantum electrodynamic (QED) effects, including quantum radiation reaction and multiphoton Breit–Wheeler pair production, which become important at irradiances ${\sim } 10^{23}\ \mathrm {W}\ \mathrm {cm}^{-2}$. Our results show that QED effects help particles gain higher energies with the presence of preformed plasma. In the results for all cases, preplasma leads to more efficient laser absorption and produces more energetic charged particles, as expected. In the case where QED is included, however, physical mechanisms changed and generated secondary particles ($\gamma$-rays and positrons) reversing this trend. That is, the hot electrons cool down due to QED effects, while ions gain more energy due to different acceleration methods. It is found that more energetic $\gamma$-rays and positrons are created with increasing scale length due to high laser conversion efficiency (${\sim }$24 % for $\gamma$-rays and $\sim$4 % for positrons at $L = 7\ \mathrm {\mu }\textrm {m}$ scale length), which affects the ion and electron acceleration mechanisms. It is also observed that the QED effect reduces the collimation of angular distribution of accelerated ions because the dominant ion acceleration mechanism is changing when QED is involved in the process.

Keywords

PIC simulationsparticle accelerationlaser-plasma interactions
Type
Research Article
Information
Journal of Plasma Physics , Volume 87 , Issue 6 , December 2021 , 905870602
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Copyright
Copyright © The Author(s), 2021. Published by Cambridge University Press

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References

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