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Design of a beam energy recovery system for application to the CPI VKS-8262S S-band klystron is presented. The multi stage pulsed depressed collector optics, mechanical and thermal design, energy recovery modulator, and experimental program will be highlighted.

CPI has successfully completed a development program to design and build a 5MW X-band klystron for medical and cargo screening applications. The VKX-8253A amplifier is water-cooled, solenoid focused, fixed tuned klystron. SN-001 was built and tested in 2011 and demonstrated 5.4MW of peak and 18kW of average RF power at 9.3 GHz. The design approach and the experimental results will be discussed in this paper.

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.

A design improvement to the VKU-7785E1 klystron electron gun has been successfully implemented which reduces the frequency of grid (cathode to focus electrode) voltage arcs. The benefits of implementing the improved gun into production has been an increase in manufacturing yield at CPI, dramatic reduction in in-coming test time by the systems integrator, and dramatic reduction of field returns, resulting in improved on-time delivery of the amplifier systems to the end user.

This paper describes the development and production activities of the VKS-7964M: an S-band, CW high-power, permanent-magnet (PM) focused, air-cooled, Multi-Stage Depressed Collector (MSDC) klystron amplifier for satellite communications and terrestrial broadcast applications.

A new line of Ka-band klystron amplifiers is under development at the Microwave Power Products Division of Communications and Power Industries, Inc. (CPI/MPP), for use in industrial and scientific applications, as well as satellite communications. These amplifiers are air-cooled, permanent magnet focused and will be both fixed (VKA-7934A) and channel tuned (VKA-7934T). A detailed description of both development efforts is discussed.