  RF power coupler is a key component of the superconducting accelerating
system in Chinese ADS proton linac injector I, which is used to transmit 15kW
RF power from the power source to the superconducting HWR cavity. According to
the requirement of working frequency, power level, transmission capability and
cooling condition, the physics design of coupler has been finished, which
includes RF structure optimization, thermal simulation, thermal stress analysis
and so on. Based on this design, the prototype of HWR coupler has been
fabricated, and then has passed the high power test successfully.
