Eucard2 crab cavities ci bids
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EUCARD2 – Crab Cavities CI Bids. G. Burt. EUCARD1. Task 1: CLIC Crab Cavities Focussed on a basic design of the CLIC crab cavity and high gradient test of the mid cells Task 2: LHC Crab Cavities Design of compact cavity shape. Beadpulls on an Aluminium test cavity.

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  • Task 1: CLIC Crab Cavities

    • Focussed on a basic design of the CLIC crab cavity and high gradient test of the mid cells

  • Task 2: LHC Crab Cavities

    • Design of compact cavity shape.

    • Beadpulls on an Aluminium test cavity.

    • Hopefully a copper prototype will also be built

  • Task 3: Crab LLRF

    • CLIC phase stability study and phase measurement

    • LHC LLRF work

Clic crab cavity r d
CLIC Crab Cavity R&D

  • CLIC-CC R&D:

    • Multi-cell 11.9942 GHz dipole-mode cavity developed.

    • Various mode damping schemes investigated:

      • Choke

      • Waveguide

    • An optimised 7-cell, waveguide damped design being investigated further.

  • LLRF R&D:

    • CLIC-CC and LHC-CC phase control models under development.

Eucard 2

  • CLIC Crab Cavities

    • Task 1: CLIC High Gradient Testing

    • Task 2: CLIC Crab Beam Dynamics & Wakefields

    • Task 3: CLIC Crab High Power Distribution

  • LHC Crab Cavities

    • Task 4: LHC Crab Cryomodule Design

    • Task 5: Cavity Testing

Gradient testing
Gradient Testing

  • To determine the maximum operating gradient for the CLIC crab cavity a special design of test cavity, compatible with the SLAC high power klystron and test stand is needed. It has been designed and is being manufactured.

  • The mid cells operate at TM110 dipole mode for maximum axial field while the matching end cells at TE111 dipole mode so that axial field =0

TM cells x 5

TE cells x 2

Clic crab high gradient tests
CLIC Crab High Gradient Tests

  • Test 1: Middle Cell Testing (EUCARD)

  • Test 2: Coupler and cavity test (Cavity made in EUCARD but testing performed in EUCARD2)

  • Test 3: Damped Cell Testing (EUCARD 2)

Clic beam dynamics and wakefields
CLIC Beam Dynamics and Wakefields

  • Found emmittance growth caused by crab cavity in CLIC BDS (Sextupole related)

  • Need further studies on mitigation of this effect

  • Also need to study

    wakefields in depth

    (single and


Clic crab high power distribution

Main beam outward pick up

12 GHz Oscillator

CLIC Crab High Power Distribution

  • Need to understand long term phase stability of the distribution scheme

  • Requires an experiment to measure phase transients.

travelling wave cavity

Laser interferometer


Dual Output or Magic Tee

Waveguide with micron-level adjustment

Waveguide with micron-level adjustment



Phase Shifter

From oscillator

12 GHz Pulsed Klystron

( ~ 20 MW )

Pulsed Modulator

Vector modulation


main beam outward pick up

Clic crab cavities
CLIC - Crab cavities

  • Lancaster, Manchester, STFC and CERN

    • 5 FTE UK Staff Effort (2.5 Manc, 2 Lancs, 0.5 STFC) £20k travel

    • £80k equipment (£30k Distribution, £50k Cavity Testing)

  • EUCARD 2 will focus on:

    • Beam dynamics and wakefield studies

    • Construction of a damped structure

    • High Power Distribution

    • Exact package will depend on current negotiations at CERN on CLIC crab programme

Lhc crab cryomodule
LHC Crab Cryomodule

  • HiLumi covers a conceptual cryostat design but EUCARD2 would look into an engineering design

Lhc crab cavity testing
LHC Crab Cavity Testing

  • Cavity designed in EUCARD and aluminium models made.

  • Need to prototype in Niobium.

  • Engineering study

    in HiLumi project but

    has little or no capital

  • Would also pay for a

    rig at Daresbury to

    perform vertical tests

Lhc crab cavities
LHC – Crab cavities

  • Lancaster, CERN, STFC, (CEA?)

  • Mainly covered by HiLumi LHC FP7 proposal

  • This doesn’t cover prototyping or engineering design of the cryostat.

  • Need to discuss EUCARD2 bid with CERN today

    • Likely to look at Cryostat Design and Cavity Testing

    • 4 FTE CI Staff Effort (1 x Lancs + 3 x STFC)

    • £120k capital


  • Crab cavities workpackage will follow on from EUCARD1.

  • LHC Crab cavity funded through FP7 HiLumi LHC proposal.

  • EUCARD2 focuses on the CLIC Crab Cavities.

  • Crab cavities

    • 9.0 FTE’s CI staff effort + CERN?

    • £20k travel

    • £200k capital