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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

RF Development for ESS

Roger Ruber and Volker Ziemann

Uppsala Universitet

4 Dec. 2009

RR+VZ: ESS RF Development


The ess proton linac
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


Rf accelerating structures
RF Accelerating Structures

synchronize particlewith anelectromagnetic wave!

Courtesy E. Jensen

RR+VZ: ESS RF Development


Superconducting elliptical cavity
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


Basic layout rf system
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


R d proposal from uppsala
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


Low level rf development
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


Rf power amplification development
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


Rf power distribution development
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


    R d facility proposal
    R&D Facility Proposal

    • Modulator, klystron, cryogenics

    • 2 Elliptical cavities in horizontal cryostat

    Courtesy CAI/N. Johansson

    RR+VZ: ESS RF Development