Alpha-, boron-, silicon- and iron-ion-induced current transients in low-capacitance silicon and GaAs diodes

High-speed current transient measurements were made over a large range of linear energy transfer (LET), using a wideband 70-GHz (6-ps-risetime) sampling oscilloscope on high resistivity GaAs diodes and 1-, 3-, and 10- Omega -cm silicon diodes. For 3- and 5-MeV alpha particles, 12-MeV boron, 18-MeV silicon, and 12- and 100-MeV iron ions incident on these devices, risetimes in the range from about 38 ps to 100 ps were produced depending on LET and device resistivity. Results are compared to the productions of various models. >