Fig. 1. Schematic of experimental arrangement.

Fig. 2. (a) Time-domain waveforms of EMPs measured by the electric field discone antenna at position a for targets with different Ti doping contents. (b) Maximum, minimum, and average (dashed line) values of the EMP amplitude for targets with different Ti doping contents.

Fig. 3. (a) Power density spectra (the main portion from 0 Hz to 2.5 GHz) of EMPs obtained by FFT and squaring of the time-domain signals. (b) Integrated power density spectra of EMPs from 0 Hz to 6.25 GHz.

Fig. 4. (a) Power density spectra of EMPs measured by the horn antenna outside the target chamber (the main portion from 0 Hz to 3 GHz). (b) Integrated power density spectra of EMPs from 0 Hz to 6.25 GHz.

Fig. 5. EMP signals measured by a magnetic field B-dot antenna at positions a (70°) and b (25°) for the shots with 3% Ti doped targets.

Fig. 6. (a) Original hot electron energy spectra for a 7% doped target at 0° and 20°, where 0° is the laser incidence direction and the black and red lines are for 0° and 20°, respectively. (b) Integrated spectra from (a).

Fig. 7. Target–holder–ground dipole radiation model.¹¹

Fig. 8. EMP signal measured by a magnetic field B-dot antenna (at position a) for a 7% Ti doped target.