Abstract
An on-axis coupled continuous wave (cw) electron linac has been designed for operation under 63% beam loading conditions. A prototype 2450 MHz linac structure has been constructed to determine operational stability at power levels up to 200 kW/m, corresponding to an average energy gradient of 3.5 MeV/m. Heat transfer from the structure to the cooling water has been optimized by computer modeling. Mechanical behaviour and predicted changes in the rf parameters during high power operation are described.

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