Ultrafast proton radiography of the magnetic fields generated by a laser-driven coil current

Abstract

Magnetic fields generated by a current flowing through a U-shaped coil connecting two copper foils were measured using ultrafast proton radiography. Two $\sim$1.25 kJ, 1-ns laser pulses propagated through laser entrance holes in the front foil, and were focused to the back foil with an intensity of $\sim$3 $\times$ 10${}^{16}$ W$/$cm${}^2$. The intense laser-solid interaction induced a high voltage between the copper foils and generated a large current in the connecting coil. The proton data show $\sim$40-50 Tesla magnetic fields at the center of the coil $\sim$3-4 ns after laser irradiation. The experiments provide significant insight for future target designs that aim to develop a powerful source of external magnetic fields for various applications in high-energy-density science.

References in corpus (3)

• Precision mapping of laser-driven magnetic fields and their evolution in high-energy-density plasmas
• Magnetic field generation by the Rayleigh-Taylor instability in laser-driven planar plastic targets
• Development of an Interpretive Simulation Tool for the Proton Radiography Technique

Cited by in corpus (14)

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• Progress in relativistic laser-plasma interaction with kilotesla-level applied magnetic fields
• Reconstructing magnetic deflections from sets of proton images using differential evolution
• Record Magnetic Field Generation by Short-Pulse Laser-Driven Capacitor-Coil Targets
• Diagnosing electric and magnetic fields in laser-driven coil targets
• Generation of focusing ion beams by magnetized electron sheath acceleration
• Time-Resolved Interferometric Measurements of Plasma Density Evolution in Laser-Driven Capacitor-Coil Targets
• Enhancement of ablative Rayleigh-Taylor instability growth by thermal conduction suppression in a magnetic field
• Emission of electromagnetic waves as a stopping mechanism for nonlinear collisionless ionization waves in a high-$\beta$ regime
• Plasma Flow Generation and Particle Acceleration from Expanding Magnetic Bubbles