RF Power Source Development for the High Current Linear Accelerator of the Spaliation Neutron Source (SNQ)

The SNQ linear accelerator design demands a rf pulse power of 267 MW at 324 MHz with 6% duty cycle, generated by 89 klystron ampflifiers, each capable of 3,5 MW of saturated peak power. Fast analog and pulse control response to achieve the required rf field stability under heavy beam loading conditions and maximum operational efficiency are major aspects of the rf system design. The advanced technique of a grid controlled klystron which is provided as rf generator accomplishes both aspects simultaneously. Test results obtained with a preliminary industrial klystron and further development steps are reported and discussed under consideration of the requirements.