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Published byArabella Payne Modified over 9 years ago
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EMMA Cavity Update Emma Wooldridge 27/02/07
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Requirements Initial Design Cavity Options & Optimisation Available Designs Future Work
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Requirements 19 Cavities Run from multiple IOTs or klystrons Voltage ~ 135 – 200 kV Shunt Impedance ~ 3 MΩ Beam pipe radius 19 mm Length 110 mm flange to flange –76 mm internal width
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Shunt Impedance P = Power V = Cavity Voltage R sh = Shunt Impedance
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Initial Design The ELBE bunching cavity For use on EMMA the shunt impedance must be increased from 1.4 MΩ
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Cavity Options Modified ELBE design Scaled PEP II design Something else?
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Optimising the Design Change –Width A –Height B –Nose cone Penetration C Radius D Angle E (All done whilst keep the frequency at 1.3 GHz)
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Effect of Cavity Width
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Nose Cone Angle
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ELBE Like Design Nose cones have been made smaller Corners have been chamfered
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PEP II Like Design Nose cones shallower Shape is flattened out
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New Design Torus shape High Shunt Impedance
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Nose Cone Radius
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Comparison Practical shunt impedance assumes 80% of theoretical value
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Field on axis Voltage / V Distance / mm BPM at 97mm
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Voltage / V BPM at 97mm
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Distance / mm Voltage / V BPM at 97mm
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Closest BPM approx. 97 mm away from cavity centre Maximum voltage from cavity on BPM is 1 V.
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Further Work Include realistic beam tubes Investigate half re- entrant design Add Coupler Add Tuners – 5.5 MHz Could cavity HOMs be used as BPMs?
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