An Untuned Type RF Cavity using Multiple Power Feeding

摘要

A ferrite loaded untuned type RF cavity has been fabricated and tested for a compact proton synchrotron dedicated for medical use. Using a new power-feed method named as multi-feed coupling, a gap voltage of more than 1kV has been achieved with the generator power of 1.5kW in the frequency range from 1.5MHz to 10MHz. These values satisfy the requirement of a few hundred volts for the medical synchrotron. The multi-feed coupling has been confirmed to be effective by high power tests. The temperature rise caused by power loss in ferrite cores was less than 25 degrees up from the room temperature at 2 hours after the start of the power feeding when the generator power was1kW. This cavity can therefore be operated only by the forced air cooling system.