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ESS linac

ESS linac. Mats Lindroos, Cristina Oyon and Steve Peggs. ESS facility technical objectives: 5 MW (upgrade 7.5 MW) long pulse source ≤2 ms pulses ≤20 Hz Protons (H+) Low losses High reliability, >95%. Design update: ESSB Preparatory work. ESS-Bilbao WORKSHOP PARTICIPANTS.

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ESS linac

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  1. ESS linac Mats Lindroos, Cristina Oyon and Steve Peggs

  2. ESS facility technical objectives: • 5 MW (upgrade 7.5 MW) long pulse source • ≤2 ms pulses • ≤20 Hz • Protons (H+) • Low losses • High reliability, >95%

  3. Design update: ESSB Preparatory work ESS-Bilbao WORKSHOP PARTICIPANTS The workshop brought together more than 160 experts from across the world, leaders in the fields of high power proton accelerators, beam dynamics and targets, in a format and infrastructure that promoted open discussion, while maintaining the focus of documenting clear recommendations for future collaborative R&D efforts.

  4. Reference group meetingshttp://indico.hep.lu.se/categoryDisplay.py?categId=44 • RG1: CERN, 6 February 2009 • Present: 7 people (ESS, CERN, BNL, CEA) • Theme: Recent progress in SCRF technology and what implications this has on the ESS (2003) linac design • Main outcome: Tentative parameter list for ESSS linac proposal • RG2: Lund, 25 February 2009 • Present: 9 people (ESS, CERN, BNL, CEA, TSL, MSL, FNAL) • Theme: Develop the tentative ESSS linac design from RG1 • Main outcome: PAC09 contribution • RG3: CERN, 5 June 2009 • Present: 20 people • Theme: What can we learn from SNS and the SPL study? • Main outcome: Demonstrated the necessity to prototype and perform (cold) acceptance tests of all structures. Decision to work on strong links to both SNS and CERN-SPL • RG4: Århus, 9 October 2009 • Present: 30 People • Theme: Transition (energy) from NC to SC structures • RG5: Bilbao, 23 November 2009 • Present: 35 People • Theme: Beam losses and operational simulations

  5. Design update: ESSS Preparatory work • Work with expert group (the ESSS linac reference group) 352.2 MHz 704.4 MHz

  6. Many cavities! • Approx. 200 cavities, RF distribution is a major part of budget! • Minor default => Major problem, big risk • Can we keep RF source and distribution budget under or at level with the 2003 design value?

  7. In lay-out pictures

  8. Lay-out of the full segmented linac

  9. RF distribution

  10. RF test stand in Uppsala

  11. ESS Guidelines (adopted by ESS STC) • Starting point is the 2008 ESFRI Roadmap specification • Performance parameters  • Neutron production 30 times SNS today • Peak neutron flux 30 times ILL´s average flux • Time-averaged flux equal to ILL •  Electrical power supply 32 MW to 38 MW • Accelerator key parameters  • A proton linac • Proton energy range: 1 to 2.5 GeV • Pulse frequency range: 10 to 20 Hz • Pulse length range: 0.8 to 2 msec • Beam power nominal: 5 MW • Beam on target: > 95 % reliability • Beam loss: ~ 1 W/m • Target station key parameters • A single target station • Cold and cold-thermal moderators • A liquid metal target: mercury or lead-alloys, Solid rotating target as fall-back • 22 beam ports (11 North, 11 South) • or 11 beam ports South and 22 neutron guides North.

  12. Base line for ESS – v0 Technical Design Report with cost to completion for the end of 2012: • Proton linac: 5 MW, protons, 1.0-2 ms pulse, 20 Hz at 2.5 GeV • Aim for 1.0 ms pulse length • Priority: i) power couplers (>1.2 MW?), ii) additional cryomodules and/or iii) higher energy • Final decision on pulse length to be taken for the TDR • Upgradable for higher power (repetition rate or pulse current) and for H- 10-50 MeV • Higher energy: • Size of moderator • Distribution and direction of hadronic cascade

  13. Examples of risks to be addressed • High losses in the linac • Action: Comprehensive studies of beam dynamics (simulations and theory) • Poor reproducibility in cavity performance • Action: Quality control during manufacturing and prototyping of a sufficient large number of cavities • Limits in cavity performance due to field emission • Action: Prototyping and comprehensive tests of complete cryomodule • Lower power limit than expected of power couplers • Action: Prototyping, sufficient conditioning facilities and contingency in linac design

  14. Writing Group • Project plan for the linac design update and prototyping • Design Report for the end of 2012 • Prototyping will run longer • Responsibilities within WG • S.Peggs – Beam physics • C.Oyon – project planning • M. Lindroos – coordination • R. Duperrier – System • WG schedule and milestones • Status report 3 February STC • Presentation of project plan 23 April STC • Review and audit of Project plan before STC in October

  15. Collaboration model for linac design! • Work Package (work areas) • 1. Management Coordination (ESS) • 2. Accelerator Physics (ESS) • 3. Infrastructure Services (Tekniker, Es) • 4. SCRF Spoke cavities (Orsay, Fr) • 5. SCRF Elliptical cavities (CEA, Fr) • 6. Front End and NC linac (INFN, It, TBC) • 7. Beam transport, NC magnets and Power Supplies (ÅU, Dk) • 8. RF Systems (UU, Se)

  16. Collaboration model: Required • A collaboration to share interesting R&D, assure an all European effort and kick start the ESS work • A strong Coordination Team in Lund to take the intellectual ownership of the design, to follow the work, to assure good project cost control, and to be responsible for project integration • A collaboration board to assure good coordination and to address poor performance • Use of common standards, web based documentation, regular reporting and appropriate costing tools • Regular reviews of critical path deliverables and even milestones of large work packages (if at a single institute)

  17. Synergies with SPL project at CERN

  18. Synergies for linac b=0.15 b=0.35 • Spoke resonators • Two prototypes @ 352 MHz (b 0.15 and b 0.35) fabricated and tested. • Half-wave resonators • Two prototypes @ 352 MHz (b 0.17 and b 0.31) fabricated and tested ALL SUCCESFULLY TESTED !

  19. Conclusions • The ESS linac project plan • In progress… • But at a stage when new partners can join! • Looking forward to work together with new and old friends in Portugal

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