The development by Stanford Linear Accelerator Center (SLAC) of a PPM-focused klystron has eliminated the power hungry solenoid, but still requires the use of 60 costly permanent magnet segments. SLAC has in its planning stage a multiple beam klystron (MBK) which would reduce, by half, the number of klystrons required, but each would require 192 magnet segments. CTL plans to demonstrate, using the beamstick being fabricated on a current Phase I Department of Energy SBIR project, the use of Long Period Focusing to reduce the number of single beam klystron magnet segments to 16, and MBK segments to 24 (an 8:1 reduction). Using the beamstick being fabricated on a current Phase I Department of Energy SBIR project, electron beam transmission will be measured with four different long period focusing geometries. The results will be incorporated into the paper design of a new low-cost multiple beam klystron for the NLC.
Commercial Applications and Other Benefits as described by the awardee: Long period permanent magnet focusing can be used to replace conventional periodic focusing in any single or multiple beam rf generator, at a substantial cost savings. The benefit applies to civilian and military radar klystrons, as well as accelerator klystrons.
