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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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slide1

Status of 325MHz coupler

S. Kazakov

11/29/2011

slide5

Cryomodule flange

3’’x 0.0315’’ stainless steel tube

Matching bump

Arc detector

Ceramic window

80K interception

Antenna

Air inlet

Bellows

e-pickup port

5K interception

Cold flange

3-1/8’’ coaxial input

Spring to compensate thermal expansion

slide6

Main sizes of coupler

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

slide7

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

slide8

Joints of inner conductor

Air holes

Thermal isolation

Bayonet connection

Stainless steel air tube

Copper

Stainless steel tube

Bronze bellows

Nut

Spring

50 lb

slide10

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

slide11

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%)

slide13

Thermal properties

Dimensions:

Pin – input power

P_2K, P_5K, P_80K – dissipated powers at 2K, 5K, 80K

P_pl – cryo-plant power

slide14

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)
slide15

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.