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High Bandwidth Transverse Feedback Path to Full Function System

High Bandwidth Transverse Feedback Path to Full Function System. Constraints and Assumptions Staged Path Decisions and Deliverables . W. Hofle . Time Line Constraints . LS1 and LS2 Major works in SPS tunnel only in Long Shutdowns

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High Bandwidth Transverse Feedback Path to Full Function System

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  1. High Bandwidth Transverse FeedbackPath to Full Function System • Constraints and Assumptions • Staged Path • Decisions and Deliverables W. Hofle

  2. Time Line Constraints • LS1 and LS2 • Major works in SPS tunnel only in Long Shutdowns • Long Shutdowns dictated by LHC schedule: assume 3 years LHC running in between long shutdowns • SPS-LIU • Implementation in LS2 (2018) • Commissioning with beam after LS2 (2019 ) • Ramp down of LIU funds with commissioning after LS2 • LARP • Ramp up of funds now within LARP required to maintain momentum • Signing of an agreement CERN-US essential for a “Full function system” developed in collaboration with US labs • Construction Project Funds assumed from 2017 • LNF-INFN • Support for kicker design and impedance highly valuable, maintain at level agreed within Hi-Lumi LHC

  3. Phased Schedule decisions phase 3: LHC post LS1 Physics Run LS1 Year 1 LS2 Year 2 Year 3 2019 2011 2012 2013 2018 2014 2015 2016 2017 Phase 1: Demonstrator 1 New Kicker New Power amplifiers Phase 2: Bunch Train Demonstrator R&D and operation New Pick-up R&D / prototyping ? Electronics R&D phase 2 beam tests with Bunch trains (ecloud) Scrubbing beam In ramp and at 450 GeV flat top Phase 3: Full implementation

  4. Decisions and Preparations in LS1 • LS1 • Locations for new pick-up and kicker: dispersion suppressor LSS3+ and LSS3- • Layout fully compatible with LS2 work for 200 MHz RF system upgrade • Cabling for new pick-up and kicker completed in LS1, 7/8” smooth wall coaxial cables (lower dispersion than corrugated cables), controls cable • Vacuum chamber layout modifications to be done in LS1 to receive kicker and pick-up post LS1  1. decisions on interfaces  2. ECR (before end of 2013) • 18 months minimum to produce kicker at CERN (E. Montesinos) • Kicker Design • Design report for kicker: complete before end of October 2013 • Decide on • bandwidth required • structure type suitable • kick strength  power  market survey and tender for amplifiers • Kicker Construction • construct 1 prototype plus spare parts (Faltin type offers full BW in single structure) • advance with design for strip-line in parallel (more flexibility: BW vs. kick strength)

  5. Deliverables and Milestones: Phase 2 • Kicker Design report: October 2013 • J. Cesaratto (editor) • Kicker electromagnetic design(s): December 2013 • Proposal by Design Team • Kicker prototype(s) mechanical design and production +18 months • E. Montesinos • Pick-up design / down selection: December 2013 • Market Survey & Amplifier Tender out March 2014 • RF Group (support by BI, LARP appreciated) • Bunch Train Demonstrator electronics: Mid 2014, tentatively • SLAC (48 bunch demonstrator)

  6. J. Dusatko, SLAC

  7. J. Dusatko, SLAC

  8. 20142016 CERN decision required for future crate electronics standard (BE-RF-CS, BE-CO) J. Dusatko, SLAC

  9. Simulations and MD program between LS1 and LS2 • Simulations and Control Algorithms: • Deliver results before start-up for Q20 along the ramp (ecloud and TMCI) • Bandwidth and Control algorithms for Q20 • MD Program: • 25 ns bunch trains • Scrubbing beam • Single Bunch MDs, lower priority, useful due to higher availability • Beam along the ramp • Increased support by OP and ABP for systematic parameter logging in MDs

  10. Full Function System after LS2 • Kickers and amplifiers • 2x4 m can be used in LSS3+ and LSS3- with aperture now considered • Beam tests in phase 2 with new kickers and simulations will determine kick strength and number of kickers required for the final system • Answers not expected before 2016 • Budget for 4 Faltin type kickers with 2x2 kW each or 1 Faltin type kicker and 12x10cm strip-lines (less power required, but if 2 kW amplifier available  use it ?) • Production kickers and amplifiers delivered in 2018, cabling in LS2 • Pick-up: • Installation at the latest in LS2 • Electronics: • Production system deployed in 2019 • 2 years for final development and production from start of DOE construction project • Electronics is generic, risk for cost is in power / # kickers required

  11. Summary of Staged Approach • Phase 1 completed: Single Bunch demonstrator with limited power and bandwidth • Phase 2: 1 GHz bandwidth with 3x kick strength of phase 1 • Phase 2 MDs: Intra-bunch damping with full bandwidth for bunch train subject to ecloud instability • Phase 3: Decisions on final system • Construction of final system with DOE funds from 2017 onwards • Commissioning after LS2 (2019+)

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