Calculation of coaxial line X-ray responses by transmission line method and finite difference time domain method

For calculating the coaxial line responses in X rays environment, transmission line (TL) method and finite difference time domain (FDTD) method are presented up respectively. Using charges of the central wire, distributed charge in insulation and the result of test, the current source of TL equations and the current density of Maxwell equations are presented. As an example, the central wire currents of the load under the condition of the matching load of cable ends are calculated using the two methods for energy of 60 keV, and the central wire currents of different energies are calculated with TL method. Numerical results indicate that the responses currents of the two methods are consistent, electrostatic field exists in the insulator, and the central wire currents have a maximum value fo