Development program for a 200-kW, c-w gyrotron. Quarterly report No. 13, July-September 1982

The objective of this program is the design and development of a millimeter-wave device to produce 200 kW of continuous wave power at 60 GHz. Testing continued on gyrotron S/N 1A and S/N 2 during this report period. S/N 1A attained a peak power level of 285 kW under short pulse conditions. Long pulse measurements up to 100 ms were attempted with the tube detuned for minimum output power. A problem with the RF water load limits the maximum power level at which the tube will operate. S/N 2 was tested with pulse widths up to 15 ..mu..s. This tube appears to have a limited operating region, and the cause of this limitation is being investigated. A mock-up of the collector cooling scheme for the CW gyrotron was constructed in order to determine the integrity of the thin fins. A flow of 345 gpm (limited by the source) was obtained with a reasonable pressure drop of 60 psi. This assembly operated for one hour with no apparent damage. A new, broader band window for use on CW gyrotrons has been designed and fabrication has started. Progress was made on the Gyrotron CW test facility.