Radio frequency source for accelerator

Radio frequency sources of much greater power will be required in the future. This report presents some ''unsuccessful'' attemps made in developing or modifying various radio frequency sources for synchrotron linac, synchrotron main ring and Tristan. The first example cited is inner discharge breakdown in a connector, supplied by a French company, which was used to connect an RG117U coaxial cable with a WX-58D coaxial cable. It was found that the connector did not meet the requirements for imported components, suggesting that great care should be taken in adopting imported products. Dielectric breakdown occurred between the primary and secondary coils of a heater transformer in a power source for a linac, which resulted in secondary breakdown in a control connect, high-voltage capacitor and anmeter. This was attributed to inappropriate maintenance. An aluminum conductor in a WX-1500 wave guide was melted due to discharge heat resulting from insufficient tightening of a connecting frange, an unbelievable mistake made by experts. Other troubles occurred from insufficient knowledge, carelessness, insufficient experience, miscalculation, etc. (Nogami, K.)