Construction and test of a confined flow multiple beam gun for a 50 MW klystron

Summary form only given. The amount of RF power produced in a linear beam microwave tube is dependent on the amount of beam power transmitted through the circuit, but the amount of current transmitted is limited by space charge forces. One way to reduce the space charge forces is to use a multiplicity of electron beams that traverse the circuit through individual beam tunnels. This allows operation at significantly lower voltage while enhancing the RF performance. The challenge is to develop electron guns and the associated magnetic circuit to confine and compress the electron beams and transport them through the separate beam tunnels to the spent beam collector. Calabazas Creek Research, Inc. is developing a 50-100 MW, multiple beam gun (M13G) for an X-band klystron. A beam analyzer is also being built to measure the current profile across one of the electron beams at various axial positions. This presentation describes various components of the gun, including construction and assembly and beam analyzer test results.