1 / 31

EVOLUTION OF BEAM CHARACTERISTICS DURING THE LIU PROJECT

EVOLUTION OF BEAM CHARACTERISTICS DURING THE LIU PROJECT. R. Garoby for the LIU Project Team March 7, 2012 CERN. Introduction Action plan Expected proton beam characteristics I n 2012 B etween LS1 and LS2 After LS2 Summary. Objectives. Mandate

savea
Download Presentation

EVOLUTION OF BEAM CHARACTERISTICS DURING THE LIU PROJECT

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. EVOLUTION OF BEAM CHARACTERISTICS DURING THE LIU PROJECT R. Garoby for the LIU Project Team March 7, 2012 CERN

  2. Introduction • Action plan • Expected proton beam characteristics • In 2012 • Between LS1 and LS2 • After LS2 • Summary

  3. Objectives • Mandate “The LHC Injectors Upgrade should plan for delivering reliably to the LHC the beams required for reaching the goals of the HL-LHC. This includes LINAC4, the PS booster, the PS, the SPS, as well as the heavy ion chain.” Implementation The LIU Project will: • Analyze the status of the injectors and the HL-LHC requirements, • Propose an upgrade path for the injectors, exploiting the work done by the Task Forces on the „PSB energy upgrade“ and „SPS upgrade“ and by the Working Group on the SPS upgrade, • Organize the upgrades (WBS with resources and planning) and take care of their implementation, • Take care of hardware and beam commissioning.

  4. Project Organization Breakdown Structure Director of Accelerators and technology - Steve Myers LIU Project team Roland Garoby (Project Leader) - Malika Meddahi (Deputy) - Brennan Goddard (LIU-SPS machine coordinator) - Simone Gilardoni (LIU-PS machine coordinator) - Klaus Hanke (LIU-PSB machine coordinator) - Maurizio Vretenar (Linac4 Project Leader)- Laurette Ponce (Project Safety Officer)-Django Manglunki (LIU-Ion chain coordinator) LIU- PS coordination team S.Gilardoni – Activity Leader H. Damerau– Deputy and Scientific secretary https://espace.cern.ch/liu-project/liu-ps/ LIU-SPS coordination team B.Goddard E.Shaposhnikova – Deputy G.Rumulo – Scientific secretary https://espace.cern.ch/liu-project/liu-sps/default.aspx LIU-Project Safety coordination L. Ponce Linac4 Project M.Vretenar http://linac4-project.web.cern.ch/linac4-project/ LIU-PSB coordination team K.Hanke – Activity leader B.Mikulec – Deputy V.Raginel – Scientific secretary https://espace.cern.ch/liu-project/liu-psb/ LIU Administrative Support: Cécile Noels. Project Support: Pierre Bonnal, Sylvain Weisz, TadeuszKurtyka - EVM coordinators: De Jonghe, Benoît Daudin

  5. Introduction • Action plan • Expected proton beam characteristics • In 2012 • Between LS1 and LS2 • After LS2 • Summary

  6. Goals § Means • To increase performance • Brightnessä • Increase injection energy in the PSB from 50 to 160 MeV, Linac4 (160 MeV H-) to replace Linac2 (50 MeV H+) • Increase injection energy in the PS from 1.4 to 2 GeV, increasing the field in the PSB magnets, replacing power supply and changing transfer equipment • Upgrade the PSB , PS and SPS to make them capable to accelerate and manipulate a higher brightness beam (feedbacks, cures against electron clouds, hardware modifications to reduce impedance…) • To increase reliability and lifetime (until ~2030!) • (tightlylinkedwithconsolidation) • Upgrade/replace ageing equipment (power supplies, magnets, RF…) • Improve radioprotection measures (shielding, ventilation…)

  7. PSB upgrades Doubling of density in transverse phase planes New RF system 160 MeV H- injection 2 GeV upgrade

  8. PS upgrade Increasedintensity / bunch 2 GeV injection Increased transverse brightness Radioprotection

  9. SPS upgrade Increased transverse brightness Increasedintensity

  10. Overall Plan

  11. Timeline PSB-PS transfer 1.4 GeV 2 GeV • Length of LS2: minimum 12months (required by SPS 200 MHz) • 2019 commissioning: several months PSB H- injection could be available Chamonix 2012 Linac 4 ready LS1 for injectors LS2 for injectors 2019 2012 2013 2014 2015 2016 2017 2018 SPS aC coating, 200 MHz power upgrade completed Injectors commissioned

  12. Introduction • Action plan • Expected proton beam characteristics • In 2012 • Between LS1 and LS2 • After LS2 • Summary

  13. Brightness and PS beam gymnastics H. Damerau – Chamonix2012 • Per bunch to LHC: horizontal scale depends on split-factor in PS • el 1.1 eVs • The smaller the splitting ratio the better, but • Price to pay: • Shorter batches at PS extraction • Longer filling time + less bunches in LHC Intensity per bunch to SPS/LHC (no losses in PS/SPS): Nb from PSB [1010]

  14. Beam characteristics in 2012 H. Damerau – Chamonix2012 • Achieved performance  expected performance from assumptions • Insignificant gain expected from Linac4/PSB without 2 GeV upgrade

  15. Introduction • Action plan • Expected proton beam characteristics • In 2012 • Between LS1 and LS2 • After LS2 • Summary

  16. Main work on the acceleratorsduring LS1 • PSB: • Construction of H- injection equipment(magnets, pulsers, vacuum chambers and valves…) • Cabling for H- injection equipment • Replacement of beam dump and crane • Preparation for new main power converter (new building) • Upgrade of beam instrumentation (new orbitmeasurement system and devices for H- injection) • New LLRF and prototype RF cavity • PS: • Radiation shielding on Road Goward and above septum 16 • Finemet-based longitudinal damper • New beam instrumentation (fastBLMs, study of IPMs) • Design/order of power converters for lowenergy correctors • SPS: • Preparation for upgrade of 200 MHz RF system • Installation of aCcoated vacuum chambers in 2-4 half-cells • Upgrade of transverse damper • Installation of wide band transverse feedback • Beaminstrumentation (BFCT upgrade, BGI development, new diamondBLMs, prototype mechanics for new wire scanner) Cabling! Cabling of fibre opticbackbone and one LSS + some coaxial cables!

  17. Pure h= 21 2.5 GeV Alternative beam gymnastics after LS1 Pure h= 21 H. Damerau – Chamonix2012 2.5 GeV Pure h= 9 •  •  •  • 7  21 • 7 21 • 7 21 • Similar schemes as shown in Chamonix 2011; option for high-intensity LHC-type bunches: • Several manipulations proposed to achieve very low emittance • First MDs in 2012 • Splittings on the flat-top not possible in 2012 due to hardware limitations • Decision on implementation Q4/2012 • Could become operational for Q2/2014 • h = (7  8 ) 9  ...  14 • h = (7  8 )9  ...  14 • h = (7  8 )9  ...  14 • 15  16  ...  21 • 15  16  ... 21 • 15  16  ...  21 •  •  •  Pure h= 21 2.5 GeV Pure h= 9 Pure h= 7

  18. Potential beam characteristics after LS1 H. Damerau – Chamonix2012 • 30% higher than today with 50 ns

  19. Brightness in SPS and LHC filling schemes H. Damerau – Chamonix2012 • Q20 optics, single bunch • 2011 performance on flat-top achieved during MD with Q20 optics • Further optimization? • Multi-bunch limit? • MDs in 2012 to explore H. Bartosik • vertical • horizontal • More injections into SPS to recover from shorter PS batches

  20. Introduction • Action plan • Expected proton beam characteristics • In 2012 • Between LS1 and LS2 • After LS2 • Summary

  21. Basic assumptions • Beamparameters are givenat injection in LHC: beamloss and blow-up inside the LHC are not accounted for. • All necessaryimprovements are implemented in the injectors (Linac4, PSB to PS transferat 2 GeV, coupledbunchinstabilitiessuppressed, e-cloudsuppressed, hardware upgraded…) • Estimatedbeamdegradationin the acceleratorchain (basedon observations in 2010): • PS: 5 % beamloss, 5 % transverse blow-up • SPS: 10 % beamloss, 10 % transverse blow-up. • «Standard» RF gymnastics are kept, imperfections are unchanged: • +-10 % fluctuation of all bunchparameterswithin a given PS bunch train. • Traces of ghost/satellite bunches.

  22. 25 ns after LIU upgrade B. Goddard – Chamonix2012 • Limit is 2.3 1011p+/b in 3.6 um at SPS extraction (1.6 1011in 2.3 um) • Limited* by space charge in PS Batch compression might bridge the gap… *Coresubject of investigation

  23. 50 ns after LIU upgrade B. Goddard – Chamonix2012 • Limit is 2.7 1011p+/b in 2.7 um at SPS extraction • Limited* by longitudinal instabilities in PS and SPS, and by brightness in SPS *Coresubjects of investigation

  24. Let’sdream… Batch compression might bridge the gap… B. Goddard – Chamonix2012 1.4 2.3

  25. Impact on other users of proton beams • The LIU project is designed to have no detrimental effect on other users than LHC. • However: • New beam gymnastics in the PS will decrease the availability of the injectors for non-LHC users, • Many actions will increase performance /pulse (Potential for e.g higher beam energy/higher beam power to ISOLDE, higher intensity per pulse in the PS and SPS...) • Specific analysis will be required for every user to determine how much performance could progress beyond today’s level. In the case of neutrino beams , for example, such an analysis is foreseen in the context of the LAGUNA-LBNO.

  26. Introduction • Action plan • Expected proton beam characteristics • In 2012 • Between LS1 and LS2 • After LS2 • Summary

  27. Beamparametersat LHC injection [25 ns] HL-LHC requirementat 7 TeV Anticipated performance after LIU Nominal performance Today (2012) After LS1 (with batch compression)… H/V transverse emittances [mm.mrad] SPS single bunchlimit Bunchintensitywithin constant longitudinal emittance [x1011 p/b]

  28. Beamparametersat LHC injection [50 ns] HL-LHC requirementat 7 TeV Anticipated performance after LIU Nominal performance After LS1… Today (2011) H/V transverse emittances [mm.mrad] SPS single bunchlimit Bunchintensitywithin constant longitudinal emittance [x1011 p/b]

  29. Final comments about proton beams • Preliminary HL-LHC requirements are very demanding for the injectors. Their final definition shall result from interactions between both projects (2nd joint «Brainstorming» session on March 30, 2012). • MDs until the end of 2012 will help refine the knowledge and understanding of the injectors and specify precisely the upgrades. • End 2012/beginning 2013, the performance goals of the LIU project will be specified and the precise list of hardware modifications with their specifications will be issued.

  30. Comments about other ion beams D. Manglunki – Chamonix2012 • With the present injector complex, increasing the number of bunches seems to be the only route to a marginally higher luminosity, at the expense of a longer LHC filling time, • If we are to implement the suggested improvements in order to reach the required Pb-Pb luminosity (provided the LHC can digest it), it is more than time to start the R§D on all parts of the injector chain, • Ar and Xe will be available after LS1 (parameter list still to be defined and optimised) but other species, if desired, would come in addition, and require more studies, in particular a new source & pre-accelerator for deuterons, or safety and handling issues for Uranium.

  31. THANK YOU FOR YOUR ATTENTION!

More Related