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Cavity Measurements By Aaron Cheng 4 May 2007
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2 Overview RF measurements Waveguide-coax transition
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3 RF measurements FETS 4-vane RFQ copper cold model in Imperial College
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4 RF measurements Input couplers used
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5 RF measurements Some coupling stability problems
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6 RF measurements Some coupling stability problems
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7 Waveguide-coax transition Studying doorknob wg-coax Coupler with coaxial RF window S11 = -14.7527dB S21 = -0.14029dB DescriptionValue [mm] radius of coax conductor33.5 Radius of coax insulator77 coax line length300 doorknob distance from wg end plate 231.84 doorknob height139.57 doorknob radius206.91 thickness of doorknob wall10.6 waveguide length1000 window position from waveguide10 window thickness6
![7 Waveguide-coax transition Studying doorknob wg-coax Coupler with coaxial RF window S11 = dB S21 = dB DescriptionValue [mm] radius of coax conductor33.5 Radius of coax insulator77 coax line length300 doorknob distance from wg end plate doorknob height doorknob radius thickness of doorknob wall10.6 waveguide length1000 window position from waveguide10 window thickness6](http://images.slideplayer.com/27/9116428/slides/slide_7.jpg "7 Waveguide-coax transition Studying doorknob wg-coax Coupler with coaxial RF window S11 = dB S21 = dB DescriptionValue [mm] radius of coax conductor33.5 Radius of coax insulator77 coax line length300 doorknob distance from wg end plate doorknob height doorknob radius thickness of doorknob wall10.6 waveguide length1000 window position from waveguide10 window thickness6")
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8 Studying doorknob wg-coax Coupler with planar RF window S11 = -35.2005dB S21 = -0.000034dB DescriptionValue [mm] radius of coax conductor33.5 Radius of coax insulator77 coax line length300 Doorknob distance from wg end plate 287.89 doorknob height139.57 doorknob radius200 thickness of doorknob wall10.6 waveguide length1000 window position from doorknob96.25 window thickness3.5 Waveguide-coax transition
![8 Studying doorknob wg-coax Coupler with planar RF window S11 = dB S21 = dB DescriptionValue [mm] radius of coax conductor33.5 Radius of coax insulator77 coax line length300 Doorknob distance from wg end plate doorknob height doorknob radius200 thickness of doorknob wall10.6 waveguide length1000 window position from doorknob96.25 window thickness3.5 Waveguide-coax transition](http://images.slideplayer.com/27/9116428/slides/slide_8.jpg "8 Studying doorknob wg-coax Coupler with planar RF window S11 = dB S21 = dB DescriptionValue [mm] radius of coax conductor33.5 Radius of coax insulator77 coax line length300 Doorknob distance from wg end plate doorknob height doorknob radius200 thickness of doorknob wall10.6 waveguide length1000 window position from doorknob96.25 window thickness3.5 Waveguide-coax transition")
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9 Studying doorknob wg-coax Coupler with planar RF window S11 = -33.7465dB S21 = -0.00015221dB ParameterValue [mm] radius of coax conductor33.5 Radius of coax insulator77 coax line length300 coax distance from waveguide end plate231.84 doorknob height139.57 doorknob radius171.27 thickness of doorknob wall10.6 waveguide length1000 window inner radius229 window thickness6 Waveguide-coax transition
![9 Studying doorknob wg-coax Coupler with planar RF window S11 = dB S21 = dB ParameterValue [mm] radius of coax conductor33.5 Radius of coax insulator77 coax line length300 coax distance from waveguide end plate doorknob height doorknob radius thickness of doorknob wall10.6 waveguide length1000 window inner radius229 window thickness6 Waveguide-coax transition](http://images.slideplayer.com/27/9116428/slides/slide_9.jpg "9 Studying doorknob wg-coax Coupler with planar RF window S11 = dB S21 = dB ParameterValue [mm] radius of coax conductor33.5 Radius of coax insulator77 coax line length300 coax distance from waveguide end plate doorknob height doorknob radius thickness of doorknob wall10.6 waveguide length1000 window inner radius229 window thickness6 Waveguide-coax transition")
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10 Studying t-bar wg-coax Coupler with coaxial RF window S11 = -59.6085dB S21 = -0.018748dB DescriptionValue [mm] coax line conductor radius33.5 coax line insulator radius77 coax line length-200 t-shape distance from waveguide end- plate 121.76 t-shape height153 window height11 position of window from waveguide128.5 Waveguide-coax transition
![10 Studying t-bar wg-coax Coupler with coaxial RF window S11 = dB S21 = dB DescriptionValue [mm] coax line conductor radius33.5 coax line insulator radius77 coax line length-200 t-shape distance from waveguide end- plate t-shape height153 window height11 position of window from waveguide128.5 Waveguide-coax transition](http://images.slideplayer.com/27/9116428/slides/slide_10.jpg "10 Studying t-bar wg-coax Coupler with coaxial RF window S11 = dB S21 = dB DescriptionValue [mm] coax line conductor radius33.5 coax line insulator radius77 coax line length-200 t-shape distance from waveguide end- plate t-shape height153 window height11 position of window from waveguide128.5 Waveguide-coax transition")
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11 Studying t-bar wg-coax Coupler with planar RF window S11 = -27.1593dB S21 = -0.0095028dB DescriptionValue [mm] coax line conductor radius33.5 coax line insulator radius77 coax line length-200 distance from waveguide end-plate120.5 t-shape height144.42 window thickness8.7 position of window from t-bar center45 Waveguide-coax transition
![11 Studying t-bar wg-coax Coupler with planar RF window S11 = dB S21 = dB DescriptionValue [mm] coax line conductor radius33.5 coax line insulator radius77 coax line length-200 distance from waveguide end-plate120.5 t-shape height window thickness8.7 position of window from t-bar center45 Waveguide-coax transition](http://images.slideplayer.com/27/9116428/slides/slide_11.jpg "11 Studying t-bar wg-coax Coupler with planar RF window S11 = dB S21 = dB DescriptionValue [mm] coax line conductor radius33.5 coax line insulator radius77 coax line length-200 distance from waveguide end-plate120.5 t-shape height window thickness8.7 position of window from t-bar center45 Waveguide-coax transition")
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12 Thermal analysis Vacuum pumping ports and requirements Electron probes and threshold Connecting flanges Waveguide-coax transition
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13 Summary 1.Bead pull measurement to be conducted more with unbrazed and brazed RFQ 2.Waveguide-Coax transition will stop at current status until after PAC conference 3.Other matters: Microwave signal generator and amplifier have arrived, currently placed in RAL
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