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RF Development for ESS

RF Development for ESS. Roger Ruber and Volker Ziemann Uppsala Universitet 4 Dec. 2009. The ESS Proton Linac. High reliability: >95% 2.5 GeV, 2.0 ms pulses at 20 Hz 50 mA, average 5.0 MW (beam loss <1 W/m) Future upgrade to 75 mA, 7.5 MW Services: electricity, vacuum

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RF Development for ESS

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  1. RF Development for ESS Roger Ruber and Volker Ziemann Uppsala Universitet 4 Dec. 2009 RR+VZ: ESS RF Development

  2. The ESS Proton Linac • High reliability: >95% • 2.5 GeV, 2.0 ms pulses at 20 Hz • 50 mA, average 5.0 MW (beam loss <1 W/m) • Future upgrade to 75 mA, 7.5 MW • Services: • electricity, vacuum • cooling water and liquid helium • RF power at 352.2 and 704.4 MHz RR+VZ: ESS RF Development

  3. RF Accelerating Structures synchronize particlewith anelectromagnetic wave! Courtesy E. Jensen RR+VZ: ESS RF Development

  4. Superconducting Elliptical Cavity Use waveguide with ”discs” to slow down EM wave; vphase = vparticle < c Travelling or standing wave SC Cavity Courtesy E. Jensen Courtesy CERN LHC-PHO-1994-006 RR+VZ: ESS RF Development

  5. Basic Layout RF System • LLRF: • RF source, regulate (A, Ph) • monitor cavity RF (A,Ph) • cavity tuning • High power RF: • klystron amplifier • power distribution (A, Ph) • power coupler, HOM coupler HOM damping RR+VZ: ESS RF Development

  6. R&D Proposal from Uppsala • Development 704 MHz RF system • Development and test of LLRF controls • signal generation, power modulation, cavity tuning (FB+FF) • Development and test of high power components: • 1 MW vector modulator, 8 MW pulse modulator, 4 MW klystron • power couplers, circulators, phase shifters, loads • Tests facility with • 2 Elliptical cavities in horizontal cryostat • Modulator, Klystron, Cryogenics • Test different RF distribution system combinations • 1 or 2 cavities per klystrons • with and without vector modulator RR+VZ: ESS RF Development

  7. Low Level RF Development • FB + FF • signal generation • high power modulation, • cavity tuning:Detuning under • Pulsed power (microphonics, Lorenz detuning) • Beam loading → cavity moves away from resonance • Counteract with mechanical tuner and RF phase (FB+FF) CourtesyDESY/S. Simrock RR+VZ: ESS RF Development

  8. RF Power Amplification Development • 8 MW high voltage pulse modulator [Scandinova] • 4 MW power amplifier (klystron) • CPI VKP-7952 klystron: • 704.4 MHz, 1 MW, 2 ms pulse • 95 kV, 21 A beam • 40 dB gain; 65 % efficiency • 5x1x1.5 m; 2.5 ton RR+VZ: ESS RF Development

  9. RF Power Distribution Development • RF distribution: • 2 cavities per klystronmajor cost saving! • with or without1 MW vector modulator • Power components: • power couplers, • HOM couplers, • circulators, • phase shifters, • loads Courtesy CERN/D. Valuch Vector Modulator RR+VZ: ESS RF Development

  10. R&D Facility Proposal • Modulator, klystron, cryogenics • 2 Elliptical cavities in horizontal cryostat Courtesy CAI/N. Johansson RR+VZ: ESS RF Development

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