Field reconstruction from proton radiography of intense laser driven magnetic reconnection

Palmer, C. A. J.; Campbell, Paul; Ma, Yingjuan; Antonelli, L.; Bott, A. F. A.; Gregori, G.; Halliday, J. W. D.; Katzir, Y.; Kordell, Peter; Krushelnick, K.; Лебедев, С. В.; Montgomery, Eric; Notley, M.; Carroll, D. C.; Ridgers, C. P.; Schekochihin, A. A.; Streeter, M. J. V.; Thomas, Alexander; Tubman, Eleanor; Woolsey, N. C.; Willingale, L.

doi:10.1063/1.5092733

Cited by 29 publications

(16 citation statements)

References 41 publications

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“…Proton backlight images and reconstructed magnetic field structure. [24] 100 T and L ∼ 1mm, but the problem is the reconnection velocity V R (≪ c) in most of experiments. The relativistic magnetic reconnection with V R /c ∼ 1 and E nt ≫ mc 2 is most of the case in astrophysics.…”

Section: Magnetic Reconnection Experimentsmentioning

confidence: 99%

“…Proton backlight diagnostics now provide the special distribution of magnetic fields. The time evolutions of proton image and magnetic field are shown in Figure 7 [24] .…”

Section: Magnetic Reconnection Experimentsmentioning

confidence: 99%

“…Figure 7. Proton backlight images and reconstructed magnetic field structures [24] . dimensional analysis we can give a simple relation of the non-thermal particle energy E nt :…”

Section: Magnetic Reconnection Experimentsmentioning

confidence: 99%

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Recent progress of laboratory astrophysics with intense lasers

Takabe

Kuramitsu

2021

High Pow Laser Sci Eng

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Thanks to a rapid progress of high-power lasers soon after the birth of laser by T. H. Maiman in 1960, intense lasers have been developed mainly for studying scientific feasibility of the laser fusion in the world wide. Inertial confinement fusion with intense laser has attracted attention as a new future energy after two oil crises from 1970s -1980s. From the beginning, the most challenging physics is known to be the hydrodynamic instability to realize the spherical implosion to achieve more than 1000 times the solid density. A lot of studies have been carried out theoretically and experimentally on the hydrodynamic instability and resultant turbulent mixing of compressible fluids. During such activities in laboratory, the explosion of supernova SN1987A was observed in the sky on February 23, 1987. The x-ray satellites have revealed that the hydrodynamic instability is a key issue to understand the physics of supernova explosion. After strong interaction of laser plasma researchers and astrophysicists, the laboratory astrophysics with intense lasers has been proposed and promoted around the end of 1990s. The original subject was mainly related to hydrodynamic instabilities. However, after two decades of the laboratory astrophysics research, we can now find a diversity of its research topics. It has been demonstrated that a variety of nonlinear physics of collisionless plasmas can be studied in laser ablation plasmas in the last decade theoretically and experimentally. In the present paper, we shed light on the recent ten topics intensively studied in laboratory experiments. Brief review is given by citing recent papers. Then, modeling cosmic-ray acceleration with lasers is reviewed in a following session as a special topic to be the coming main topics in laboratory astrophysics research.

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Section: Magnetic Reconnection Experimentsmentioning

confidence: 99%

“…Proton backlight diagnostics now provide the special distribution of magnetic fields. The time evolutions of proton image and magnetic field are shown in Figure 7 [24] .…”

Section: Magnetic Reconnection Experimentsmentioning

confidence: 99%

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Recent progress of laboratory astrophysics with intense lasers

Takabe

Kuramitsu

2021

High Pow Laser Sci Eng

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“…In the limit where the electric potential is much smaller than the proton energy, the deflection of the protons is small, and the predicted proton radiograph can be calculated as described by Kugland et al [ 22 , 23 ]. This is the case here as the electric potential energy is ∼ k B T e —as can be seen from equation ( 2.4 )—which figure 1 shows is hundreds of eV, whereas protons used in proton radiography have energies >MeV.…”

Section: Comparison Of Kinetic To Mhd Simulationsmentioning

confidence: 99%

The inadequacy of a magnetohydrodynamic approach to the Biermann battery

Ridgers

Arran

Bissell

et al. 2020

Phil. Trans. R. Soc. A.

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Magnetic fields can be generated in plasmas by the Biermann battery when the electric field produced by the electron pressure gradient has a curl. The commonly employed magnetohydrodynamic (MHD) model of the Biermann battery breaks down when the electron distribution function is distorted away from Maxwellian. Using both MHD and kinetic simulations of a laser-plasma interaction relevant to inertial confinement fusion we have shown that this distortion can reduce the Biermann-producing electric field by around 50%. More importantly, the use of a flux limiter in an MHD treatment to deal with the effect of the non-Maxwellian electron distribution on electron thermal transport leads to a completely unphysical prediction of the Biermann-producing electric field and so results in erroneous predictions for the generated magnetic field. This article is part of a discussion meeting issue ‘Prospects for high gain inertial fusion energy (part 2)’.

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“…The proton radiography diagnostic allows probing of transient and quasistatic magnetic field structures in plasmas [1,2]. It has been used to image magnetic fields in laboratory analogs of astrophysical collisionless shocks [3][4][5], the Weibel instability in interpenetrating plasma flows [6], stochastic magnetic fields amplified by the turbulent dynamo mechanism [7], and fields involved in laser-driven magnetic reconnection [8,9]. In the higher-density physics regime, proton radiography has been used to probe plasma fields in imploding inertial fusion capsules in both direct-drive [10][11][12] and indirect-drive laser-hohlraum [13][14][15] configurations and in studies of laser channelling physics relevant to fast ignition [16].…”

Section: Introductionmentioning

confidence: 99%

Methods for extremely sparse-angle proton tomography

et al. 2021

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Proton radiography is a widely fielded diagnostic used to measure magnetic structures in plasma. The deflection of protons with multi-MeV kinetic energy by the magnetic fields is used to infer their path-integrated field strength. Here the use of tomographic methods is proposed for the first time to lift the degeneracy inherent in these path-integrated measurements, allowing full reconstruction of spatially resolved magnetic field structures in three dimensions. Two techniques are proposed which improve the performance of tomographic reconstruction algorithms in cases with severely limited numbers of available probe beams, as is the case in laser-plasma interaction experiments where the probes are created by short, high-power laser pulse irradiation of secondary foil targets. A new configuration allowing production of more proton beams from a single short laser pulse is also presented and proposed for use in tandem with these analytical advancements.

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Field reconstruction from proton radiography of intense laser driven magnetic reconnection

Abstract: This is a repository copy of Field reconstruction from proton radiography of intense laser driven magnetic reconnection.

Cited by 29 publications

References 41 publications

Recent progress of laboratory astrophysics with intense lasers

Recent progress of laboratory astrophysics with intense lasers

The inadequacy of a magnetohydrodynamic approach to the Biermann battery

Methods for extremely sparse-angle proton tomography

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