A developing application of laser-driven currents is in generating magnetic fields of picosecond-nanosecond duration with magnitudes exceeding $B=10$~T. Single loop and helical coil targets can direct laser-driven discharge currents along wires to generate spatially-uniform, quasi-static magnetic fields on the millimetre scale. Here, we present proton deflectometry across two axes of a single loop coil ranging from $1$ to $2$~mm in diameter. Comparison with proton tracking simulations show that measured magnetic fields are the result of kiloampere currents in the coil and electric charges distributed around the coil target. Using this dual-axis platform for proton deflectometry, robust measurements can be made of the evolution of magnetic fields in a capacitor coil target.
Bradford Philip, Read Martin, Ehret Michael, Antonelli Luca, Khan Matthew, Booth Nicola, Glize Kevin, Carroll David, Clarke Rob, Heathcote Robert I., Ryazantsev Sergey, Pikuz SA, Spindloe Christopher, Moody J. D., Pollock B.B, Tikhonchuk Vladimir, Ridgers Christopher, Santos João Jorge, Woolsey Nigel. Proton deflectometry of a capacitor coil target along two axes[J]. High Power Laser Science and Engineering, , (): .