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EMMA RF System Summary

EMMA RF System Summary. RF Requirements (S Berg): Aperture: Aperture 34.7 mm (min) Dispersion effects may increase by 3 – 4 mm Frequency: Frequency range 5.5 MHz Voltage: Nominal voltage of 120 kV/cavity up to 180kV would be nice! Not much interesting above 360 kV. RF Cavity.

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EMMA RF System Summary

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  1. EMMA RF System Summary • RF Requirements (S Berg): • Aperture: • Aperture 34.7 mm (min) • Dispersion effects may increase by 3 – 4 mm • Frequency: • Frequency range 5.5 MHz • Voltage: • Nominal voltage of 120 kV/cavity • up to 180kV would be nice! • Not much interesting above 360 kV

  2. RF Cavity • Optimised geometry developed (E Wooldridge): 2.1 M limit proposed in Jan07

  3. Cavity Issues • For the baseline (120kV) cavity design looks ok. • Evanescent field not zero at the cavity flanges  large signals at BPM’s (50x too large!) • Issues: • Asymmetric beam-pipe geometry • Damping e-m fields external to cavity • Moving the BPM further away • Making cavity beam pipe elliptical • Input coupler and tuning • Using cavity HOMs as BPM?

  4. RF Distribution • Power sources identified (C Beard): • 20 kW IOT e2v integrated amplifier • 30 kW IOT Thales/CPI (non-integrated) • 160 kW Klystron e2v

  5. RF Distribution • Integrated e2v IOT amplifier includes: • HVPS • Drive amplifier • Cooling • Local controls • Non-integrated IOT and klystron needs these separately • HVPS options: • 1 large HVPS • Baseline 30kV/5A (IOT) or 48kV/6A (Klystron) • Multiple small HVPS • Baseline 30kV/1A for each IOT • In early 2009, the SRS RF HVPS will become available: • 50kV/10A DC supply • Configured to power a modulating anode klystron • Needs modifying to power proposed IOT/klystrons • Additional costs incurred (needs to be assessed)

  6. RF Distribution • With 19 cavities, distribution will be complicated regardless of solution adopted. • 4 cavities/IOT • 19 cavities/klystron • Distribution options: • Waveguide hybrid splitters • Waveguide adaptive couplers • Combiner cavity (requires R&D) • Individual cavity phase provided in distribution line (waveguide or coax) • LLRF cavity phase compensation provided per amplifier distribution

  7. Distribution Issues • For the various distribution options: • Assess detailed costings • Investigate physical limitations

  8. New Actions

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