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IVEC Summary, Session 13, Klystrons I 
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Session chairperson and summary author: Glenn Scheitrum

The first paper in this session was delivered by Paul Tallerico and dealt with the RF system for the Spallation Neutron Source (SNS). Los Alamos is responsible for the RF system that will drive the SNS proton accelerator. A superconducting cavity design was chosen after evaluating both normal and superconducting cavity accelerator designs. Paul described the performance objectives and current status of the three klystron designs that will be used in the accelerator. These consist of seven, 2.5 MW, 402.5 MHz klystrons, six, 5 MW, 805 MHz klystrons and eighty-one, 550 kW, 805 MHz klystrons. All the devices must support a 1ms pulse at 60 Hz.

Steve Lenci of CPI reported on the development of a 805 MHz, 550 kW klystron for SNS. An overview of the design and some initial RF data were presented.

The third paper of the session was presented by Tom Hargreaves on an earlier klystron design for SNS. The 805 MHz klystron has a peak output power of 2.75 MW. Tom presented data on operation into a 1.2 to 1 mismatch.

The final paper of the session was presented by Nikita Ryskin from the Saratov State University in Russia. He discussed both theory and hot test results of chaotic behavior in a multicavity klystron. By adjusting the amount of feedback or the beam current, the klystron could be made to oscillate. Further increases in feedback or beam current produced period doubling and then chaos. One application for the device would be as a wide band noise source for modern communication systems.

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