Magnetic fields generated by a current flowing through a U-shaped coil connecting two copper foils were measured using ultrafast proton radiography. Two similar to 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 similar to 3 x 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 similar to 40-50 T magnetic fields at the center of the coil similar to 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. (C) 2016 AIP Publishing LLC.
展开▼
