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CLIC DB injector front end update on the work package

CLIC DB injector front end update on the work package. Description of the work package Drive Beam Klystron status Overview of the ongoing work Collaborations Outlook, planning. CLIC DB injector front end update on the work package.

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CLIC DB injector front end update on the work package

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  1. CLIC DB injector front end update on the work package • Description of the work package • Drive Beam Klystron status • Overview of the ongoing work • Collaborations • Outlook, planning

  2. CLIC DB injector front end update on the work package • Original: Work package in EV, ‘CLIC0 Drive Beam’, with the goal to built a full injector up to 12 MeV for integrated beam tests until 2017 • Reduced scope: ‘CLIC Drive Beam injector R&D’ with the goal to do key hardware development and independent tests to enable the construction of an injector after 2017

  3. CLIC DB front end Modulator-klystrons, 1 GHz, 15 MW IOTs ?, 500 MHz Diagnostics SHB 1-2-3 Acc. Structures Gun PB Buncher ~ 12 MeV ~ 3 MeV ~ 140 keV Gun, sub-harmonic bunching, bunching, three accelerating structures, 5 long pulse klystrons and modulators, diagnostics, beam line

  4. CLIC DB front end Hardware R&D Modulator-klystron, 1 GHz, 20 MW 500 MHz Gun ~ 140 keV Diagnostics SHB 1 Acc. Structures Reduced scope: Gun, sub-harmonic buncher, rf-unit, diagnostics, injector design

  5. What is part of the work package ? Development and validation of an rf unit for the CLIC DB (Modulator, Klystron, Accelerating-Structure, test stand) Design of the injector, mainly beam dynamics, SHB design +prototype, beam diagnostics design + prototypes Design, prototype and test of a electron source suitable for the DB injector, gun test area, diagnostics Contributions from different CLIC activities, collaborations and CERN groups

  6. 10 MW L-band klystrons for ILC In terms of achieved RF efficiency, the klystrons with RF circuit adopted by Toshiba and CPI provides values very close to the 70%, as is specified in CLIC CDR (67.8% for CPI and 68.8% for Toshiba. These values validate the feasibility of a slightly higher efficiency with minimised design/fabrication efforts, when scaled in frequency down to 1.0 GHz. Igor Syratchev

  7. 20 MW L-band klystron for CLIC Gun topology scaling scenarios Our study of scaling the existing technology shows reasonable evidence that 6 beam MBK with 20 MW peak RF power might be the best compromise for the CLIC-type L-band klystron, providing high (>70%) efficiency, long (>150 000 hours) life time and operated at a reasonable (164 kV) cathode voltage. This choice also may be the most cost efficient.

  8. Tentative klystron parameters Status: Preparation of call for tender

  9. Klystron Modulator and test stand Status: see presentation from D. Aguglia • Create a 1 GHz test stand together with TE-EPC to test the two prototype modulators and klystrons into loads • Establish HV and rf- measurements to study and demonstrate stability of the DB rf-system • Use facility to test DB accelerating structure and components with high power under nominal parameters • 1 GHz test stand (needed in 2015): • Aim to share high power test stands in the rf group, possible candidate sides (~50 m2 needed): Bldg. 112 (LHC), 150 (CLIC), 152 (Linac4)

  10. Sub-harmonic bunching system Status: RF design existing, mechanical design advanced, Next: launch prototype (in aluminum ?) Power source: 500 MHz, 34-82 kW, wide band (60 MHz) sources needed for fast phase switching. Started to discuss with industry. Hamed Shaker, see IPAC paper

  11. DB injector review and optimization Final phase space at 50 MeV after re-optimization of the injector with realistic rf parameters, 4% satellites, good longitudinal phase space Shahin Sanaye Hajari, see as well IPAC paper

  12. DB injector review and optimization Shahin Sanaye Hajari, see as well IPAC paper Total losses reduced from 30% to 11%

  13. Gun Test Facility • Gun test area: • former GTF available, Bldg. 162-R-004/008, needs some refurbishment

  14. Gun simulations Using EGUN e ~ 12 mm mrad

  15. Gun simulations Emittancevs voltage

  16. Jacques Gardelle Contour plots of field components at t=35ns Typical MAGIC snapshot: particle positions in r-z Typical MAGIC snapshot: kinetic energy of particles along z

  17. DB-Gun strategy and planning

  18. Beam diagnosticsGas Jet Monitor • Fire a supersonic gas jet across the beam pipe • Jet can be arranged as a ‘screen’ at 45 to beam • Most gas collected in a receiving chamber • Advantages over residual gas monitor: • Cross-section, not separate profiles • Localised higher pressure -> faster profile measurement • Reduce vacuum contamination & losses • Two limits to resolution: • Beam Space Charge -> Need strong B and E field for extraction • Gas Jet Thickness -> Possible matter-wave focusing with Zone Plate • Test Stand at Cockcroft Institute, U.K. Beam Gas source Shaping Collection chamber Jet generation Pumping Pumping Pumping adam.jeff@cern.ch

  19. Adam’s Summary • Profile measurement for the CLIC drive beam poses challenges due to very high intensity: • Interceptive monitors would be destroyed • Strong space charge effect makes ionisation monitors tricky to implement. • Care needed to avoid wakefields • A number of options are being explored • A varied ‘toolkit’ of solutions will probably needed to cover the full DB energy range adam.jeff@cern.ch

  20. Collaborations (existing or under discussion) • CEA-CESTA: Gun and injector design, HV-modulator for the gun • IPM: Injector and SHB design • NCNR: DB accelerating structure and DB beam dynamics • IFIC: DB diagnostics, BPM and profile monitor • SLAC: gun design • Modulator: see Davide’s presentation • Klystron: collaboration with industry

  21. Outlook, Rough planning, milestones

  22. END

  23. CLIC DB injector specifications

  24. Task description

  25. Task description

  26. Space Gun test area: former GTF available, Bldg. 162-R-004/008, needs some refurbishment 1 GHz test stand: Aim to share high power test stands in the rf group, possible candidate sides (~50 m2 needed): Bldg. 112 (LHC), 150 (CLIC), 152 (Linac4)

  27. Gun geometry aim for modular design Typical example

  28. DB-accelerator structure RF-design existing, next steps: mechanical design and prototype Collaboration with National Center for Nuclear Research in Poland to built a prototype under preparation Input and output coupler design finished Correct match, input reflection < 30 dB. (red and green: two different geometries; red is final) Rolf Wegener

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