Direct measurement of kilo-tesla level magnetic field generated with laser-driven capacitor-coil target by proton deflectometry

• Published in: Applied physics letters Vol. 108; no. 9
• Main Authors: Law, K. F. F., Bailly-Grandvaux, M., Morace, A., Sakata, S., Matsuo, K., Kojima, S., Lee, S., Vaisseau, X., Arikawa, Y., Yogo, A., Kondo, K., Zhang, Z., Bellei, C., Santos, J. J., Fujioka, S., Azechi, H.
• Format: Journal Article
• Language: English
• Published: Melville American Institute of Physics 29-02-2016
• Subjects: Amplitudes; Applied physics; Capacitors; Deflection; Laser beams; Lasers; Lorentz force; Magnetic fields; Magnetic probes; Magnetic shielding; Monte Carlo simulation; Proton beams; Protons; Sheaths
• ISSN: 0003-6951; 1077-3118
• DOI: 10.1063/1.4943078

A kilo-tesla level, quasi-static magnetic field (B-field), which is generated with an intense laser-driven capacitor-coil target, was measured by proton deflectometry with a proper plasma shielding. Proton deflectometry is a direct and reliable method to diagnose strong, mm3-scale laser-produced B-field; however, this was not successful in the previous experiment. A target-normal-sheath-accelerated proton beam is deflected by Lorentz force in the laser-produced magnetic field with the resulting deflection pattern recorded on a radiochromic film stack. A 610 ± 30 T of B-field amplitude was inferred by comparing the experimental proton pattern with Monte-Carlo calculations. The amplitude and temporal evolutions of the laser-generated B-field were also measured by a differential magnetic probe, independently confirming the proton deflectometry measurement results.