  For the first time, a global model of electromagnetic pulse (EMP) emission
connects charge separation in the laser target to quantitative measurements of
the electromagnetic field. We present a frequency-domain dipole antenna model
which predicts the quantity of charge accumulated in a laser target as well as
the EMP amplitude and frequency. The model is validated against measurements
from several high-intensity laser facilities, providing insight into target
physics and informing the design of next-generation ultra-intense laser
facilities. EMP amplitude is proportional to the total charge accumulated on
the target, but we demonstrate that it is not directly affected by target
charging time (and therefore the laser pulse duration) provided the charging
time is shorter than the antenna characteristic time. We propose two
independent methods for estimating the charging time based on the laser pulse
duration. We also investigate the impact of target holder geometry on EMPs
using cylindrical, conical and helical holders.
