A laser combines wth target chamber fulfil a system of high power (PW) ultrashort (~20 fsec) laser beam. It heats the target inside the interaction chamber. The chamber is in vacuum of 10-7mbar and the interaction between the laser and the target causes both an electromagnetic pulse (EMP) and electrons to be emitted (~1012) from the target. The T-probe purpose is to supply read of the target current, which is flows in the system. The EMP disturbance can be characterized by number of differential equations and related parameters (based on equivalent circuit of the target probe). The delay parameters (τ1, τ2) in times characterize the EMP interaction (parasitic effects which are second components of EMP) with the chamber, laser and target, and time delay τ3 is related to employ coaxial cable. The investigation of our laser and target chamber system is based on non linear dynamic theory which investigate the behaviour through delay differential equations (DDEs) which is dependent on variable parameters. All of that for optimization of a laser and target chamber system parameters analysis to understand EMP disturbances. The analysis involves graphs of function of τ1, τ2, τ3.