Generating high-yield positrons and relativistic collisionless shocks by 10 PW laser

Jiao, Jing; Zhang, B.; Yu, Jinqing; Zhang, Z.; Yan, Yue; He, Simin; Deng, Zhigang; Jiang, Teng; Wang, Hong; Gu, Yuqiu

doi:10.1017/s0263034617000106

Cited by 7 publications

(2 citation statements)

References 24 publications

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“…To ascertain the specific state of the boron target after it is ablated, we have performed a one-dimensional radiation-hydrodynamic simulation with the MULTI-1D code [22] on the interaction of a nanosecond laser pulse and a boron solid, which is the first step in the experiment of Labaune et al e MULTI-1D code has been widely used by various authors [23][24][25][26][27]. Readers are suggested to refer to Ref.…”

Section: The Interaction Between a Nanosecond Laser And A Boron Solidmentioning

confidence: 99%

Laser-Driven Proton-Boron Fusions: Influences of the Boron State

Ning

Liang

et al. 2022

Laser Part. Beams

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The proton-boron (p 11 B) reaction is regarded as the holy grail of advanced fusion fuels, where the primary reaction produces 3 energetic α particles. However, due to the high nuclear bounding energy and bremsstrahlung energy losses, energy gain from the p 11 B fusion is hard to achieve in thermal fusion conditions. Owing to advances in intense laser technology, the p 11 B fusion has drawn renewed attention by using an intense laser-accelerated proton beam to impact a boron-11 target. As one of the most influential works in this field, Labaune et al. first experimentally found that states of boron (solid or plasma) play an important role in the yield of α particles. This exciting experimental finding rouses an attempt to measure the nuclear fusion cross section in a plasma environment. However, up to now, there is still no quantitative explanation. Based on large-scale, fully kinetic computer simulations, the inner physical mechanism of yield increment is uncovered, and a quantitative explanation is given. Our results indicate the yield increment is attributed to the reduced energy loss of the protons under the synergetic influences of degeneracy effects and collective electromagnetic effects. Our work may serve as a reference for not only analyzing or improving further experiments of the p 11 B fusion but also investigating other beam-plasma systems, such as ion-driven inertial confinement fusions.

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Section: The Interaction Between a Nanosecond Laser And A Boron Solidmentioning

confidence: 99%

Laser-Driven Proton-Boron Fusions: Influences of the Boron State

Ning

Liang

et al. 2022

Laser Part. Beams

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“…1992; Jiao et al. 2017). It is seen in figure 6 that the electron oscillation frequency is 2 () which suggests that is the main mechanism accelerating the electrons (see figure 6).…”

Section: Epoch 2-d Pic Code Simulationsmentioning

confidence: 99%

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

Culfa

Sagir

2021

J. Plasma Phys.

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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.

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