High-Power High-Efficiency L-band Multiple-Beam Klystron Development at CPI

Abstract

Communications and Power Industries, Inc., has designed and manufactured two versions of a 10-MW-peak highefficiency multiple-beam klystron (MBK) operating at 1300 MHz. This type of klystron is favored for large particle accelerator projects such as the European X-ray Free-Electron Laser at the Deutsches Elektronen Synchrotron (DESY). Two klystrons have been made for DESY. The first-generation MBK was a vertically oriented prototype using a six-cavity design with higher order mode input and output cavities and conventional intermediate cavities. For cost and performance reasons, the secondgeneration MBK, designated VKL-8301B, utilized seven coaxial fundamental-mode cavities and is an "industrialized" horizontally oriented klystron. The klystron was designed and optimized using state-of-the-art multidimensional design codes to ensure that all performance requirements are exceeded. Agreement between the simulated and measured performances is good. The VKL-8301B prototype achieved a peak saturated RF output power of 10.4 MW and 67.8% efficiency. The data were measured at the full 1.5% duty and with 1.5-ms pulse width. The klystron satisfied all required operating conditions, including stable operation into an output mismatch of 1.2 : 1 voltage standing wave ratio at various phases. The prototype has been shipped to DESY and has been successfully tested by a customer.

High power operation of an X-band coaxial multi-beam relativistic klystron amplifier

“…[10][11][12][13][14][15][16][17] In order to achieve the goal of a GWs RKA operating at X-band, we have presented a coaxial multi-beam relativistic klystron amplifier (CMBK) combining triaxial klystron amplifier (TKA) with multi-beam klystron amplifier. [18][19][20][21][22] Then RF power of 813 MW at X-band was outputted. This paper is organized as follows.…”