Preliminary study for the laboratory experiment of cosmic-rays driven magnetic field amplification

Jao, Chun Sung; Vafin, S.; Chen, Ye; Groß, Matthias; Krasilnikov, M.; Loisch, Gregor; Mehrling, Timon; Niemiec, J.; Oppelt, A.; Ossa, A. Martínez de la; Osterhoff, Jens; Pohl, Martin; Stephan, F.

doi:10.1016/j.hedp.2019.04.001

Cited by 4 publications

(11 citation statements)

References 61 publications

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“…A fully relativistic particle-in-cell code (OSIRIS) [16,17,18] is employed. Regarding a basic setup for simulations [4], a uniform stationary plasma is filled in a two-dimensional open-boundary system (43.14 cm × 5.9 cm) and an electron beam with an initial width of 0.17 cm is applied in the simulation. The number density of stationary plasma is set as n 0 = 10 13 cm −3 .…”

Section: Plasma-astrophysical Studies Using Realistic Laboratory Elec...mentioning

confidence: 99%

“…1). The linear growth rate of the electrostatic instability, in particular, decreases with increasing the beam temperature [8,9,10,4,5]. Therefore, the impacts of different beam distributions including the produced quasi-cw beam onto the electrostatic instability are worth of first investigations.…”

Section: Plasma-astrophysical Studies Using Realistic Laboratory Elec...mentioning

confidence: 99%

“…As an alternative method apart from the classical observation and numerical simulation [1,2], it provides a novel methodology for exploring the mechanisms of astrophysical phenomena in a realistic laboratory environment based on advanced technologies and modern instrumentation in high energy physics. A research program was launched at Deutsches Elektronen-Synchrotron for establishing a so-called plasma-astrophysical laboratory for experimental studies of beam-plasma instabilities [3,4,5].…”

Section: Introductionmentioning

confidence: 99%

“…‡ The note is supplementary to the framework of laboratory plasma-astrophysical studies previously carried out at Deutsches Elektronen-Synchrotron in Refs. [3][4][5].…”

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confidence: 99%

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An improved electron beam dynamics design for laboratory plasma-astrophysical studies: a technical note

Chen,

Jao

2019

Preprint

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A technical note is given regarding our previous laboratory plasmaastrophysical studies [C.-S. Jao et al., High Energy Density Physics 32, 31-43 (2019) and Y. Chen et al., Nucl. Instrum. Methods Phys. Res., Sect. A 903, 119 (2018)]. In this note, an upgraded accelerator beamline design is proposed based on a feasible experimental setup in a realistic laboratory environment. The improved design aims to provide milliampere (mA) mega-electron-volt (MeV) quasi-continuous (cw) electron beams for plasma-astrophysical applications. Such a design utilizes a so-called mixedguiding-field magnetic system right after the cut disk structure (CDS) booster cavity to provide a periodic longitudinal focusing field. The transportation of the produced cw beam with large energy spread to the plasma cell location is improved. The magnetic field serves as well as a seeding field in the plasma environment for the growth of electromagnetic instabilities. In conjunction with the appliance of a circular collimator at the exit of the CDS, the new design allows production of quasi-cw beams with a three orders higher number density at the entrance of the plasma cell compared to the previous design for a seeding magnetic field of about 50 mT while the locally enhanced electric field at the cathode is up to 8 GV/m. The associated beam dynamics simulation results are presented. As proof of principle studies, the produced electron beams are applied in nonlinear plasma-astrophysical simulations for exploring the growth of the instabilities. The extracted parameters and/or distributions from the generated electron beams in the laboratory environment are used in these particle-incell simulations. The obtained results are presented and discussed. ‡ The note is supplementary to the framework of laboratory plasma-astrophysical studies previously carried out at Deutsches Elektronen-Synchrotron in Refs. [3][4][5].

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Section: Plasma-astrophysical Studies Using Realistic Laboratory Elec...mentioning

confidence: 99%

Section: Plasma-astrophysical Studies Using Realistic Laboratory Elec...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…‡ The note is supplementary to the framework of laboratory plasma-astrophysical studies previously carried out at Deutsches Elektronen-Synchrotron in Refs. [3][4][5].…”

mentioning

confidence: 99%

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An improved electron beam dynamics design for laboratory plasma-astrophysical studies: a technical note

Chen,

Jao

2019

Preprint

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“…One interesting laboratory experiment considered at the Photo Injector Test facility at DESY in Zeuthen (PITZ) attempts to find the responsible mechanism for PeV-scale high energy cosmic-ray particles. As a promising candidate, the Bells instability [7,8,9], a non-resonant instability driven by cosmic-ray current, is proposed to be the cause for those ultra-highly energetic particles by inducing turbulent amplification of the interstellar magnetic field in the upstream region of supernova remnant shocks. In order to study the Bells instability, a laboratory experiment using the PITZ accelerator was proposed [9,10] based on the mechanism of electron beam driven magnetic instability growth in a matching plasma environment provided by the plasma cell of PITZ [11].…”

Section: Introductionmentioning

confidence: 99%

Generation of quasi continuous-wave electron beams in an L-band normal conducting pulsed RF injector for laboratory astrophysics experiments

Chen

Loisch

Groß

et al. 2018

Nuclear Instruments and Methods in Physics Research Section A:

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We report on an approach to produce quasi continuous-wave (cw) electron beams with an average beam current of milliamperes and a mean beam energy of a few MeV in a pulsed RF injector. Potential applications are in the planned laboratory astrophysics programs at DESY. The beam generation is based on field emission from a specially designed metallic field emitter. A quasi cw beam profile is formed over subsequent RF cycles at the resonance frequency of the gun cavity. This is realized by debunching in a cut disk structure accelerating cavity (booster) downstream of the gun. The peak and average beam currents can be tuned in beam dynamics simulations by adjusting operation conditions of the booster cavity. Optimization of the transverse beam size at specific positions (e.g., entrance of the plasma experiment) is performed by applying magnetic focusing fields provided by solenoids along the beam line. In this paper, the design of a microtip field emitter is introduced and characterized in electromagnetic field simulations in the gun cavity. A series of particle tracking simulations are conducted for multi-parametric optimization of the parameters of the produced quasi cw electron beams. The obtained results will be presented and discussed.In addition, measurements of the parasitic field emission (PFE) current (dark 1 ye.lining.chen@desy.de. current) in the PITZ gun will be exemplarily shown to distinguish its order of magnitude from the produced beam current by the designed field emitter.

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Advancements in neural network techniques for electric and magnetic field reconstruction: Application to ion radiography

Jao,

Chen,

Nikaido

et al. 2024

AIP Advances

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In the realm of high-energy-density laboratory plasma experiments, ion radiography is a vital tool for measuring electromagnetic fields. Leveraging the deflection of injected protons, ion imaging can reveal the intricate patterns of electromagnetic fields within the plasma. However, the complex task of reconstructing electromagnetic fields within the plasma system from ion images presents a formidable challenge. In response, we propose the application of neural network techniques to facilitate electromagnetic field reconstructions. For the training data, we generate corresponding particle data on ion radiography with diverse field profiles in the plasma system, drawing from analytical solutions of charged particle motions and test-particle simulations. With these training data, our expectation is that the developed neural network can assimilate information from ion radiography and accurately predict the corresponding field profiles. In this study, our primary emphasis is on developing these techniques within the context of the simplest setups, specifically uniform (single-layer) or two-layer systems. We begin by examining systems with only electric or magnetic fields and subsequently extend our exploration to systems with combined electromagnetic fields. Our findings demonstrate the viability of employing neural networks for electromagnetic field reconstructions. In all the presented scenarios, the correlation coefficients between the actual and neural network-predicted values consistently reach 0.99. We have also learned that physics concepts can help us understand the weaknesses in neural network performance and identify directions for improvement.

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Preliminary study for the laboratory experiment of cosmic-rays driven magnetic field amplification

Cited by 4 publications

References 61 publications

An improved electron beam dynamics design for laboratory plasma-astrophysical studies: a technical note

An improved electron beam dynamics design for laboratory plasma-astrophysical studies: a technical note

Generation of quasi continuous-wave electron beams in an L-band normal conducting pulsed RF injector for laboratory astrophysics experiments

Advancements in neural network techniques for electric and magnetic field reconstruction: Application to ion radiography

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