Development of 352.2 MHz cavity for RF coupler conditioning facility at BARC

The power couplers used in RFQ and DTL cavities in LEHIPA are dumb bell shaped slots (iris) and two successive ridge wave guide sections which connects to a half height WR2300 waveguide and carries power from klystron. Each coupler is designed to transfer 250 kW power in continuous mode of operation at 352.2 MHz. After manufacturing and vacuum testing, each coupler has to be tested for its RF performance (coupling coefficient) and power handing capacity. High power RF conditioning facilities are being setup at IADD for LEHIPA couplers. RF conditioning facilities for 325 MHz and 650 MHz couplers are also being developed under Indian Institution Fermilab Collaboration (lIFC). A test cavity is developed to fulfill the requirement of a matched load in the conditioning set-up. The design is based on simple pillbox structure with required waveguide port, vacuum port, tuners and diagnostic ports. Water cooling is also provided to take away the dissipated power in the cavity. The cavity has been tested for any vacuum or water leaks. This paper elaborates the design, RF measurements on the test bench and manufacturing aspects of the cavity development. (author)