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Cavity Measurements

Cavity Measurements. By Aaron Cheng 4 May 2007. Overview. RF measurements Waveguide-coax transition. RF measurements. FETS 4-vane RFQ copper cold model in Imperial College. RF measurements. Input couplers used. RF measurements. Some coupling stability problems. RF measurements.

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Cavity Measurements

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  1. Cavity Measurements By Aaron Cheng 4 May 2007

  2. Overview • RF measurements • Waveguide-coax transition

  3. RF measurements FETS 4-vane RFQ copper cold model in Imperial College

  4. RF measurements Input couplers used

  5. RF measurements Some coupling stability problems

  6. RF measurements Some coupling stability problems

  7. Waveguide-coax transition • Studying doorknob wg-coax • Coupler with coaxial RF window • S11 = -14.7527dB • S21 = -0.14029dB

  8. Waveguide-coax transition • Studying doorknob wg-coax • Coupler with planar RF window • S11 = -35.2005dB • S21 = -0.000034dB

  9. Waveguide-coax transition • Studying doorknob wg-coax • Coupler with planar RF window • S11 = -33.7465dB • S21 = -0.00015221dB

  10. Waveguide-coax transition • Studying t-bar wg-coax • Coupler with coaxial RF window • S11 = -59.6085dB • S21 = -0.018748dB

  11. Waveguide-coax transition • Studying t-bar wg-coax • Coupler with planar RF window • S11 = -27.1593dB • S21 = -0.0095028dB

  12. Waveguide-coax transition • Thermal analysis • Vacuum pumping ports and requirements • Electron probes and threshold • Connecting flanges

  13. Summary • Bead pull measurement to be conducted more with unbrazed and brazed RFQ • Waveguide-Coax transition will stop at current status until after PAC conference • Other matters: • Microwave signal generator and amplifier have arrived, currently placed in RAL

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