5.1: Validation of TESLA for widely varying klystron designs

Comparison between predictions of the 2.5D large signal code TESLA and measured data for three different klystrons are presented. The klystrons cover an operating frequency range from P-band to X-band, micro-perveance between 1.1 to 2.0, parameter ga between 0.53 to 0.87 and efficiency between 43% to 62%. Two of the three devices are CPI legacy tubes that are solenoid-focused. Thousands of one type have been successfully built in CPI production lines over the last thirty years. The third device is a state-of-the-art PPM-focused klystron that was designed and manufactured recently.