Recent results from experimental and numerical investigations of the selfmagnetically BΘ-insulated ion diode

The comparison of measured to calculated data of foil acceleration experiments on KALIF showed discrepancies which made a reinvestigation of the beam characteristics produced by the BΘ-Diode necessary. It was shown that the peak power density achieved in the focus is only 0.15 TW/cm² rather than the 0.25 TW/cm² quoted earlier. In addition a most likely time history of the proton power density with a FWHM pulse duration of 60 ns in the focus is derived. The experiments led to a new description of the operating principle of this diode which has been confirmed by particle-in-cell-simulations. As a result of these considerations suggestions for a new design of the diode are derived and investigated by simulations.