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EUCARD2 – Crab Cavities CI Bids

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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EUCARD2 – Crab Cavities CI Bids

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  1. EUCARD2 – Crab CavitiesCI Bids G. Burt

  2. 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. • Hopefully a copper prototype will also be built • Task 3: Crab LLRF • CLIC phase stability study and phase measurement • LHC LLRF work

  3. 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.

  4. LHC Crab Cavity

  5. 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

  6. 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

  7. 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)

  8. 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 multi-bunch)

  9. 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 Control Dual Output or Magic Tee Waveguide with micron-level adjustment Waveguide with micron-level adjustment LLRF LLRF Phase Shifter From oscillator 12 GHz Pulsed Klystron ( ~ 20 MW ) Pulsed Modulator Vector modulation Control main beam outward pick up

  10. 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

  11. LHC Crab Cryomodule • HiLumi covers a conceptual cryostat design but EUCARD2 would look into an engineering design

  12. 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

  13. 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

  14. Summary • 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

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