Thermal analysis of Faraday cup for measuring electron beams of traveling wave tubes

Thermal analysis of Faraday cup analyzer for measuring electron beams of traveling wave tubes(TWTs) using ANSYS package is presented. With beams of different power density and different pulses, temperature of the Faraday cup had been simulated. The results show that with a single pulse, only temperature of spot size on aperture plate rises quickly, whereas temperature of other part is constant. For normal operating, pulse width must be smaller than 0.5 μs, 0.1 μs and 0.2 μs are better, to measure beams of power density larger than 5×106 W/cm2. Pulse width for measuring a beam of fixed power density should be limited, and different pulses should be used for measuring different power density beams. In addition, taking heat cumulating effect into account, suitable pulse repetition frequen