Magnet design for SLIA proof-of-concept experiment

The beam transport system for the Spiral Line Induction Accelerator (SLIA) proof-of-concept experiment (POCE, 9.5 MeV, 10 kA, 35 ns) contains seven basic magnetic field coil configurations. The magnets are for the transition from the field-free diode into the nominal 5-kG longitudinal guide field; the transition into/out of the accelerating section; the axial field within the 1.5 MV accelerating units; the matching elements for transition on/off stellarator fields in the bend; the toroidal, I=2 stellarator, dipole, and quadrupole field in the 80-cm bends; the extraction of the beam from the longitudinal guide field; and the beam steering/field correction. Because of the large number of pulse magnetic field coils in POCE, the shot-to-shot and day-to-day reproducibility of the magnet coil current from a PSI designed electrolytic capacitor bank was measured and found to be better than +0.15% for currents up to a factor of two (several kiloamperes) larger than the design values.<>