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CF flanges and copper gaskets were originally invented by William Wheeler at Varian in an attempt to build a flange that would not leak after baking. The design trapped a 0.08” thick C101 copper ring between metal knife-edges, forming a robust, demountable seal.

ConFlat Radio Frequency Flare gaskets (CF-RFF), developed by Argonne National Lab, combine UHV vacuum CF seals and radio-frequency flare (RFF) seals.

The CF-RFF gasket is unique. Vacuum tubes can be connected together by CF flanges and Radio Frequency Flare gaskets, allowing internal radio waves to flow seamlessly without the high impedance of a standard CF-to-CF seal.

Electron particle accelerators increase the kinetic energy of charged particles by subjecting the electrons to an RF source that oscillates the electric potential along the inside surface of the beam-line or accelerator ring. The Atlas CF-RFF gasket provides a UHV-compatible knife-edge seal and an RF flare seal to bridge the gap between flanges, conducting radio-frequency inside the tube.

Accelerators typically use resonant RF cavities formed from or coated with superconducting materials. Electromagnetic fields are excited in the cavity by coupling an RF source with an antenna. When the RF frequency fed by the antenna is identical to that of a cavity mode, the resonant fields build to high amplitudes. Charged particles passing through apertures in the cavity are then accelerated by the electric fields and deflected by the magnetic fields. The resonant frequency driven in SRF cavities typically ranges from 200 MHz to 3 GHz, depending on the particle species to be accelerated.

By connecting multiple resonant cavities, the CF-RFF gasket can be used to maintain radio signal throughout the complete cavity assembly.

Atlas offers CF-RFF gaskets for standard size DN Flanges (DN16 to DN200):

Flange Size

CF USA Size

Standard OD

Standard ID

DN16

1.33″

0.838″

0.640″

DN25

2.125″

1.290″

1.010″

DN40

2.75″

1.895″

1.451″

DN50

3.375″

2.425″

2.010″

DN63

4.50″

3.243″

2.506″

DN75

4.625″

3.598″

3.010″

DN100

6.0″

4.743″

4.010″

DN125

6.75″

5.567″

5.010″

DN160

8.0″

6.743″

6.007″

DN200

10.0″

8.743″

8.007″

DN250

12.0″

10.73″

10.00″

To get a product quote, fill out our contact form or call 360.385.3123

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