Status of 325MHz coupler S. Kazakov 11/29/2011. 325 MHz coupler structure.

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Presentation transcript:

Status of 325MHz coupler S. Kazakov 11/29/2011

325 MHz coupler structure

View of 325 MHZ coupler

View of 325 MHz coupler

Antenna Ceramic window Bellows 3’’x ’’ stainless steel tube e-pickup port Arc detector Air inlet Spring to compensate thermal expansion 3-1/8’’ coaxial input Cryomodule flange Cold flange Matching bump 5K interception 80K interception

Main sizes of coupler Coupler have been designed to be interchangeable with Khabibuolline-Nicol coupler

Ceramic window 0.5’’ copper tube Copper tip Bayonet connection 5K interception 80K interception E-pickup port 3’’ x 0.8mm stainless tube Vacuum part of coupler

Bayonet connection Stainless steel air tube Air holesThermal isolation Stainless steel tube Spring Nut Copper Bronze bellows 50 lb Joints of inner conductor

Assembled inner conductor

Ring with slot Slot. It is possible to place insulator for HV bias Air inlet Holes for arc detector Arc detector Connection of inner conductor with outer structure

Main electrical parameters of coupler Design CW power ~ 6kW (with air cooling, copper plated vacuum outer conductor, copper-bronze air outer conductor it can sustain several tens kW) Pulse power (breakdown in air) ~ 1MW Multifactor threshold > 6 kW SW (>25kW TW) Passband (S11 < -20dB) ~ 50MHz, (15%)

Expected passband ~ 50 MHz (S11 < -20dB), ~ 15%

Thermal properties Dimensions: Pin – input power P_2K, P_5K, P_80K – dissipated powers at 2K, 5K, 80K P_pl – cryo-plant power

Current status: Design is nearly finished. Unknown items:  Length of antenna. Coupling value should be chosen and simulated.  Tip shape (depends on test stand cavity design)  Configuration/geometry of 5K, 80K, 300K thermo-interceptors  Configuration of air part outer conductor (coated SS, copper-bronze or uncoated SS)

Next steps: If present design is acceptable (we need approval from community?), we suppose to make mechanical model to check the method of assembly, antenna air cooling, acoustic vibration of antenna.