3.1: Experimental results from a high-power broadband 18-beam klystron

We present the results of experimental measurements on an 18-beam S-band multiple-beam klystron. The electron gun has met its perveance design goal of 4.8 μPerv with very good beam transmission (>97% in the absence of rf). Preliminary rf testing has shown amplification across the full 400-MHz band (2.9 to 3.3 GHz). The MBK was recently re-gunned to correct a high pressure gas issue; further results of beam and rf performance will be presented, as available.