Toward reaching megatesla magnetic fields within the laboratory


Figure 1. Illustration of a microtube implosion. Due to the laser-produced scorching electrons with megaelectron volt energies, chilly ions within the interior wall floor implode towards the central axis. By pre-seeding uniform magnetic fields of the kilotesla order, the Lorentz drive induces a Larmor gyromotion of the imploding ions and electrons. Due to the resultant collective movement of relativistic charged particles across the central axis, sturdy spin currents of roughly peta-ampere/cm2 are produced with just a few tens of nm measurement, producing megatesla-order magnetic fields. Credit: Masakatsu Murakami

Recently, a analysis crew at Osaka University has efficiently demonstrated the technology of megatesla (MT)-order magnetic fields by way of three-dimensional particle simulations on laser-matter interplay. The power of MT magnetic fields is 1–10 billion instances stronger than geomagnetism (0.3–0.5 G), and these fields are anticipated to be noticed solely within the shut neighborhood of celestial our bodies equivalent to neutron stars or black holes. This outcome ought to facilitate an formidable experiment to realize MT-order magnetic fields within the laboratory, which is now in progress.

Since the 19th century, scientists have strived to realize the very best magnetic fields within the laboratory. To date, the very best magnetic discipline noticed within the laboratory is within the kilotesla (kT)-order. In 2020, Masakatsu Murakami at Osaka University proposed a novel scheme known as microtube implosions (MTI) to generate ultrahigh magnetic fields on the MT-order. Irradiating a micron-sized hole cylinder with ultraintense and ultrashort laser pulses generates hot electrons with velocities near the pace of sunshine. Those scorching electrons launch a cylindrically symmetric implosion of the interior wall ions in direction of the central axis. An utilized pre-seeded magnetic field of the kilotesla-order, parallel to the central axis, bends the trajectories of ions and electrons in reverse instructions due to the Lorentz drive. Near the goal axis, these bent trajectories of ions and electrons collectively type a robust spin present that generates MT-order magnetic fields.

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In this research, one of many team members, Didar Shokov, has extensively carried out three-dimensional simulations utilizing the supercomputer OCTOPUS at Osaka University’s Cybermedia Center. As a outcome, a definite scaling regulation has been discovered relating the efficiency of the technology of the magnetic fields by MTI and such exterior parameters as utilized laser depth, laser power, and goal measurement.

Toward the achievement of megatesla magnetic fields in the laboratory
Figure2. Perspective views of the normalized ion density ni/ni0 and the z-component of the magnetic discipline Bz, respectively, noticed at t∼200 fs, which is obtained by a 3D EPOCH simulation. A cubic aluminum goal with a measurement of 14 μm × 14 μm × 14 μm is about on the middle, which has a cylindrical cavity with a radius of R0 = 5 μm and an axis overlapping the z-axis. The seed magnetic discipline B0 = 6 kT parallel to the z-axis is uniformly set over the complete area. The 4 faces of the goal parallel to the z-axis are usually irradiated by uniform laser pulses concurrently, that are characterised by λL = 0.8 μm, IL =3×1021 Wcm−2 and τL =50fs. Credit: Masakatsu Murakami et al., High Power Laser Science and Engineering

“Our simulation showed that ultrahigh megatesla magnetic fields, which were thought to be impossible to realize on earth, can be achieved using today’s laser technology. The scaling law and detailed temporal behavior of the magnetic fields in the target are expected to facilitate laboratory experiments using the Peta-watt laser system ‘LFEX’ at Osaka University’s Institute of Laser Engineering, which are now in progress,” Murakami says.

Could megatesla magnetic fields be realized on Earth?

More data:
D. Shokov et al, Laser scaling for technology of megatesla magnetic fields by microtube implosions, High Power Laser Science and Engineering (2021). DOI: 10.1017/hpl.2021.46

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Toward reaching megatesla magnetic fields within the laboratory (2021, December 9)
retrieved 9 December 2021

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