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Status of 325MHz coupler - PowerPoint PPT Presentation

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Status of 325MHz coupler. S. Kazakov. 11/29/2011. 325 MHz coupler structure . View of 325 MHZ coupler. View of 325 MHz coupler. Cryomodule flange. 3’’x 0.0315’’ stainless steel tube. Matching bump. Arc detector. Ceramic window. 80K interception. Antenna. Air inlet. Bellows.

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Status of 325MHz coupler

S. Kazakov



Cryomodule flange

3’’x 0.0315’’ stainless steel tube

Matching bump

Arc detector

Ceramic window

80K interception


Air inlet


e-pickup port

5K interception

Cold flange

3-1/8’’ coaxial input

Spring to compensate thermal expansion


Main sizes of coupler

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


Vacuum part of coupler

Ceramic window

80K interception

5K interception

0.5’’ copper tube

E-pickup port

3’’ x 0.8mm stainless tube

Copper tip

Bayonet connection


Joints of inner conductor

Air holes

Thermal isolation

Bayonet connection

Stainless steel air tube


Stainless steel tube

Bronze bellows



50 lb


Connection of inner conductor with outer structure

Ring with slot

Slot. It is possible to place insulator for HV bias

Holes for arc detector

Arc detector

Air inlet


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%)


Thermal properties


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.