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Working Group for High Bandwidth Transverse Damper Introduction Hofle 1 st meeting

Working Group for High Bandwidth Transverse Damper Introduction Hofle 1 st meeting. 12.07.2012. Welcome. Mandate (by LIU SPS). provide support to produce a design report for end of 2012 advise on design choices related to Accelerator Physics and

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Working Group for High Bandwidth Transverse Damper Introduction Hofle 1 st meeting

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  1. Working Group for High Bandwidth Transverse Damper Introduction Hofle 1st meeting 12.07.2012 W. Hofle @ 1st SPS HBD WG Meeting

  2. Welcome W. Hofle @ 1st SPS HBD WG Meeting

  3. Mandate (by LIU SPS) • provide support to produce a design report for end of 2012 • advise on design choices related to Accelerator Physics and • the Implementation of the High Bandwidth Transverse Damper • Machine Developments • advise on applicability of findings to LHC and PS • members (core, to-date) • W. Hofle (convener) • C. Zannini (impedance, TMCI) • G. Rumolo(ecloud) • G. Iadarola (ecloud) • H. Bartosik (aperture, optics) • K. Li (headtail simulations) • B. Goddard (parameters, LIU) • meetings: Thursdays (3-4 times per month) • 10:30 for meetings in weeks with CERN participants only • 18:00 for meetings with participants from INFN and US (external members connected via webex) • reporting to LIU SPS Project Team Meeting, LIU SPS BDWG W. Hofle @ 1st SPS HBD WG Meeting

  4. Motivation (for HBTD) W. Hofle @ 1st SPS HBD WG Meeting

  5. From established LHC operation to LHC High Luminosity operation important for injectors: two very different scenarios: 25 ns bunch spacing 50 ns bunch spacing LIU (“LHC Injector Upgrade”) project addresses upgrades in the injector chain (LINAC)PSBPSSPS to meet HL requirements today 2014+ Future upgrade Status from May 2012 (L. Rossi @LARP CM18) W. Hofle @ 1st SPS HBD WG Meeting

  6. Transverse instabilities caused by ecloud in LHC and its injectors • PS: at very last part of beam manipulations • when 25 ns spaced bunches are shortened • horizontal coupled bunch instability, also intra bunch motion ? • SPS:all along the cycle at 25 ns bunch spacing • strong horizontal coupled bunch instability and • vertical single bunch instability with intra bunch motion • LHC: single bunch instability under study • intra bunch motion ? • signature of ecloud with its development along batch • without mitigation  instabilities lead to beam losses • and transverse emittance blow-up with direct impact on • luminosity performance in LHC • Mitigation: Transverse Feedbacks W. Hofle @ 1st SPS HBD WG Meeting

  7. Transverse Feedback Systems in LHC and its injectors W. Hofle @ 1st SPS HBD WG Meeting

  8. Feedback as cure • coherent signals visible for both ecloud and TMCI instability • provided reaction time (few turns) shorter than growth times • feedback in principle should work sum difference (delta) instability growing (TMCI) signals up to 1.6 GHz turns Frequency (0-2.5 GHz) R. de Maria et al. DIPAC 2009, MOPD17 W. Hofle @ 1st SPS HBD WG Meeting

  9. e-cloud vertical instability sum difference (delta) quadrupolar motion (longitudinal) at injection due to voltage mismatch artifact from pick-up (beam pipe cut-off) instability growing signals up to 1.2 GHz turns frequency R. de Maria et al. DIPAC 2009, MOPD17 W. Hofle @ 1st SPS HBD WG Meeting

  10. Job for high bandwidth feedback in SPS • cure transverse “single bunch” instabilities by feedback • two collective effects are limiting the • SPS performance as LHC injector • e-cloud • TMCI • similarities: both effects cause vertical intra bunch instability • high chromaticity suppresses instability to a certain extent • feedback expected to permit • running at low chromaticity and at intensities beyond which • high chromaticity is an established cure • particular important to maintain small transverse emittances • synergy with PS and LHC W. Hofle @ 1st SPS HBD WG Meeting

  11. History and Project phases W. Hofle @ 1st SPS HBD WG Meeting

  12. SPS High Bandwidth Transverse Damper Study and Project • first simulations started in 2008 and focused on damping intra-bunch transverse oscillations for proton bunches caused by ecloud effect • following these encouraging simulations a multi-lab effort started towards building a prototype system for the CERN SPS • electronics and power amplifiers for prototype system: SLAC (J. Fox et al) • new pick-ups (to do for final system deployment, CERN) • designs for new kickers, impedance (SLAC – LBNL – LNF-INFN) • collaborating team: • J. Cesaratto, J.D. Fox, M. Pivi, K. Pollock, C. Rivetta, O. Turgut, S. Uemura(SLAC) • G. Arduini, W. Hofle, K. Li, G. Rumolo, B. Salvant, H. Bartosik, C. Zannini(CERN) • M. Furman, M. Venturini, S. De Santis, Z. Paret, R. Secondo, J.-L. Vay(LBNL) • A. Drago, S. Gallo, F. Marcellini, M. Zobov(LNF-INFN) supported by US-LARP CERN SPS LIU Project lot’s of publications at conferences jointly with LARP W. Hofle @ 1st SPS HBD WG Meeting

  13. “a” Schedule review for phase 2: go / no-go phase 3: Year 1 Year 2 Year 3 Year 4 Year 5 Year 6 Year 7 2011 2012 2013 2018 2014 2015 2016 2017 Phase 1: demonstrator power amplifiers for phase 2 tendering (s) new pick-up design and construction kickers design and construction Phase 2: phase 2 beam tests Phase 3: implementation W. Hofle @ 1st SPS HBD WG Meeting

  14. R&D and staged implementation: The Path (1) Boundary conditions: LS1: 2012 LS2: 2017+ Phase 1:The demonstrator  end 2012 minimum goal: damp head tail motion of single bunch existing equipment (amplifiers, BPWs as kicker and PU) “drive experiments” successful electronics (LARP), close FB loop before end of 2012 all design specifications for phase 2: end of 2012 Phase 2: New pick-up, new kicker, consolidated electronics, higher power amplifiers, preparation of LSS3 in LS1 for installation of equipment at the end of LS1 or later in a short winter shutdown post-LS1 feedback on multi-bunch beam in presence of e-cloud decide on final implementation and LSS3 vs. LSS5 before LS2 W. Hofle @ 1st SPS HBD WG Meeting

  15. R&D and staged implementation: The Path (2) Phase 3:Final implementation in LS2 depending on desired energy range  upgrade power and if impossible to install in LSS3 for reasons of space or radiation  move to LSS5 add kicker modules if required design and construct final electronics (profit from latest technology) commission after LS2 W. Hofle @ 1st SPS HBD WG Meeting

  16. Working Group W. Hofle @ 1st SPS HBD WG Meeting

  17. List of preliminary topics • simulations with feedback for SPS with TMCI/FB model • range of beam parameters for SPS • full parameter space with ecloud simulations • impedance permitted for new kickers and pick-ups • aperture permitted for new kickers and pick-ups considering layout • find optimal kicker structure (bandwidth, power) • synergy with LHC (LHC parameters) • synergy with PS (request to PS to look for within bunch instabilities) • integration in SPS tunnel • … W. Hofle @ 1st SPS HBD WG Meeting

  18. Next meetings (tentatively) • 26.07.2012 • 02.08.2012 • 09.08.2012 • 16.08.2012 • 23.08.2012 • 30.08.2012 , 06.09.2012 probably no meeting • 13.09.2012 joint meeting with LARP • 20.09.2012 HB workshop • 27.09.2012 joint meeting with LARP Minutes (Wolfgang) W. Hofle @ 1st SPS HBD WG Meeting

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