“…In our work, a measuremet system based on the pinhole method is proposed to determine the current density distribution of electron beams [14]. In order to verify the longitudinal velocity distribution (power distribution) of electron beams of a K-band space TWT, we have designed a new compact RFEA to scan electron beams in the beam measurement system by using the same method with a Faraday cup [15,16]. The cutoff curve of beam power distribution of the K-band space TWT is obtained.…”