Current doubling in load design for Z-pinch driven ICF

Summary form only given. The "current doubling scheme" presents an opportunity for a 3-fold increase of the magnetic pressure imploding a cylindrical shell. The current doubler is topologically a toroidal two-turn vacuum coil with self-magnetic-insulated convolutes. The return current flows to the generator along the rods through the holes in a cylindrical cavity formed by the first turn of the current doubler device. The energy flows from the pulsed power driver into the first current turn, and the imploding shell is a part of the second turn. This load configuration allows increasing the azimuthal magnetic field, which drives the implosion, by a factor of 2 compared to a conventional load of the same initial inductance driven by the same generator. For the dynamic hohlraum or the double Z-pinch hard hohlraum schemes of the Sandia\´s high-yield ICF approach, current doubling can help reduce the length of a matched radiating Z-pinch load by a factor of 3. Alternatively, the output impedance of the next generation multi-MA generators can be up to 3 times higher for optimized hohlraum.