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Feedback On Nanosecond Timescales

Feedback On Nanosecond Timescales. Accelerator R&D for future Linear Colliders (LC) Philip Burrows Glenn Christian Hamid Dabiri Khah Javier Resta Lopez Colin Perry Graduate students: Christina Swinson Ben Constance Robert Apsimon Douglas Bett Alexander Gerbershagen

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Feedback On Nanosecond Timescales

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  1. Feedback On Nanosecond Timescales • Accelerator R&D for future • Linear Colliders (LC) • Philip Burrows • Glenn Christian • Hamid Dabiri Khah • Javier Resta Lopez • Colin Perry • Graduate students: • Christina Swinson • Ben Constance • Robert Apsimon • Douglas Bett • Alexander Gerbershagen • CERN, DESY, KEK, SLAC P.N. Burrows Project Review, Oxford, 11/12/09

  2. Group activities • ILC Global Design Effort: • Design of beam-based feedback systems in linacs and • Beam Delivery System • Design of Machine-Detector Interface • Design/prototyping of IP beam feedback system • ATF2 project at KEK: produce/stabilise beam at nm level •  ILC Technical Design Report in 2012 P.N. Burrows Project Review, Oxford, 11/12/09

  3. Group activities • ILC Global Design Effort: • Design of beam-based feedback systems in linacs and • Beam Delivery System • Design of Machine-Detector Interface • Design/prototyping of IP beam feedback system • ATF2 project at KEK: produce/stabilise beam at nm level •  ILC Technical Design Report in 2012 • CLIC: • All of the above • Drive-beam phase stability feed-forward system •  CLIC CDR in 2010, TDR in 2015? • Beam dynamics, mechanical design, electronic engineering P.N. Burrows Project Review, Oxford, 11/12/09

  4. Beam-based feedbacks for LCs • ILC luminosity goal 10**34 / cm**2 / s • Miniscule beams: 5nm (y) x 500nm (x) at IP • Making and colliding such beams not easy! • 3000 / 1500 bunches, spacing 150 / 300ns •  DIGITAL FB approach P.N. Burrows Project Review, Oxford, 11/12/09

  5. Beam-based feedbacks for LCs • ILC luminosity goal 10**34 / cm**2 / s • Miniscule beams: 5nm (y) x 500nm (x) at IP • Making and colliding such beams not easy! • 3000 / 1500 bunches, spacing 150 / 300ns •  DIGITAL FB approach • CLIC luminosity goal 10**35 / cm**2 / s • bunches even smaller (< 1nm) • c. 200 bunches, spacing c. 0.5ns •  ANALOGUE FB approach P.N. Burrows Project Review, Oxford, 11/12/09

  6. IP beam-based feedback for LC e+ e- P.N. Burrows Project Review, Oxford, 11/12/09

  7. IP beam-based feedback for LC Ground vibrations cause beams to miss one another e+ e- P.N. Burrows Project Review, Oxford, 11/12/09

  8. IP beam-based feedback for LC Ground vibrations cause beams to miss one another e+ e- Outgoing beams deflected P.N. Burrows Project Review, Oxford, 11/12/09

  9. IP beam-based feedback for LC Ground vibrations cause beams to miss one another e+ e- Outgoing beams deflected Measure beam position P.N. Burrows Project Review, Oxford, 11/12/09

  10. IP beam-based feedback for LC Ground vibrations cause beams to miss one another e+ Feedback circuit e- Outgoing beams deflected Measure beam position P.N. Burrows Project Review, Oxford, 11/12/09

  11. IP beam-based feedback for LC Kick beam back into collision Ground vibrations cause beams to miss one another e+ Feedback circuit e- Outgoing beams deflected ‘Intra-train’ FB Measure beam position P.N. Burrows Project Review, Oxford, 11/12/09

  12. ILC Interaction Region c. 2009 (SiD for illustration) - Oriunno Reacting bars QD0 Cam/support QF Spool tubes Opening 2 m on the beam P.N. Burrows Project Review, Oxford, 11/12/09

  13. CLIC_ILD Detector Concept: Forward Region Version 3 Nov. 2009 (by André Sailer) ECal end-cap HCal end-cap Yoke end-cap (partial) LumiCal BeamCal QD0 (partial) P.N. Burrows Project Review, Oxford, 11/12/09

  14. FONT4/5 prototypes at KEK/ATF2 Kicker BPM 1 BPM 2 BPM 3 e- 1.3 GeV Drive amplifier Analogue BPM processor 3 bunches, 140-154ns spacing Digital feedback P.N. Burrows Project Review, Oxford, 11/12/09

  15. FONT4 prototype at KEK/ATF Kicker BPM 1 BPM 2 BPM 3 e- Drive amplifier Analogue BPM processor Digital feedback P.N. Burrows Project Review, Oxford, 11/12/09

  16. BPM processor 2007 2005 2006 P.N. Burrows Project Review, Oxford, 11/12/09

  17. Digital Feedback Board JTAG port PROM Xilinx Virtex4 FPGA 40 MHz oscillator GP I/O Header Analog Devices ADC/DACs RS232 comms 2 x Analog Output channels (differential) 4 x General-purpose digital outputs 2 x Analog Input channels (single-ended) 3 x external clock/trigger inputs P.N. Burrows Project Review, Oxford, 11/12/09

  18. Kicker driver amplifier • Specifications: • +- 15A (kicker terminated with 50 Ohm) • +- 30A (kicker shorted at far end) • 35ns risetime (to 90%) • pulse length 10 us (specified for 20-60 bunches) • repetition rate 10 Hz • Outline design done in Oxford • CASE studentship w TMD Technologies • Order placed with TMD Sept 06 • Two prototype units delivered Dec 06 • 2 units in service at KEK since 2007 • (2009: upgrades made + 1 unit) P.N. Burrows Project Review, Oxford, 11/12/09

  19. FONT status • FONT4 basic operation demonstrated in 2008 running: • beam feedback along single axis (y) with few micron resolution P.N. Burrows Project Review, Oxford, 11/12/09

  20. FONT status • FONT4 basic operation demonstrated in 2008 running: • beam feedback along single axis (y) with few micron resolution P.N. Burrows Project Review, Oxford, 11/12/09

  21. FONT operations in 2009 • FONT4 installation was dismantled when ATF extraction line was reconfigured late 2008 P.N. Burrows Project Review, Oxford, 11/12/09

  22. ATF2 FB system • Dedicated • system: • 2 stripline • kickers + • fast drive amplifiers • 3 stripline BPMs + • fast analogue front-end electronics • 9-channel digital FB processor P.N. Burrows Project Review, Oxford, 11/12/09

  23. ATF2 FB system • Dedicated • system: • 2 stripline • kickers + • fast drive amplifiers • 3 stripline BPMs + • fast analogue front-end electronics • 9-channel digital FB processor P.N. Burrows Project Review, Oxford, 11/12/09

  24. ATF2 FB system • Dedicated • system: • 2 stripline • kickers + • fast drive amplifiers • 3 stripline BPMs + • fast analogue front-end electronics • 9-channel digital FB processor P.N. Burrows Project Review, Oxford, 11/12/09

  25. FONT operations in 2009 • FONT4 installation was dismantled when ATF extraction line was reconfigured late 2008 • 3 new BPMs and 2 new kickers installed in new ATF2 extraction line week of February 9 P.N. Burrows Project Review, Oxford, 11/12/09

  26. New FONT ATF2 hardware P.N. Burrows Project Review, Oxford, 11/12/09

  27. FONT: Jan-May 2009 • FONT4 installation was dismantled when ATF extraction line was reconfigured late 2008 • 3 new BPMs and 2 new kickers installed in new ATF2 extraction line week of February 9 • Main aims: • 1) commission new BPMs and kickers (digital DAQ) • 2) work on improved resolution  1 um level • 3) understand beam dynamics in FONT region • Much commissioning work done parasitically - now have FONT ‘standalone’ hardware • We typically took 1 shift per week March - May, a total of 6 shifts (!) P.N. Burrows Project Review, Oxford, 11/12/09

  28. Example: BPM calibrations P.N. Burrows Project Review, Oxford, 11/12/09

  29. Example: kicker calibration Kick of 40 urad 6

  30. Example: resolution vs. bunch Q P.N. Burrows Project Review, Oxford, 11/12/09

  31. FONT since June 2009 • New FONT5 9-channel FB/FF board (y, y’) assembled (Sept. 2009): • bench tested in Oxford (October) • sent to KEK (November) for beam tests • shipped back and repaired (1 week turnaround) • undergoing further beam tests P.N. Burrows Project Review, Oxford, 11/12/09

  32. FONT since June 2009 • New FONT5 9-channel FB/FF board (y, y’) assembled (Sept. 2009): • bench tested in Oxford (October) • sent to KEK (November) for beam tests • shipped back and repaired (1 week turnaround) • undergoing further beam tests • Replace the LO-based BPM processor • with a ‘baseband’ scheme: preliminary design; first tests early 2010 P.N. Burrows Project Review, Oxford, 11/12/09

  33. Valencia Mover P.N. Burrows Project Review, Oxford, 11/12/09

  34. ILC IP intra-train FB performance P.N. Burrows Project Review, Oxford, 11/12/09

  35. CLIC IP intra-train FB performance angle scan position scan using luminosity signal IP position FB marginal luminosity gain from scans (?) P.N. Burrows Project Review, Oxford, 11/12/09

  36. FONT plans: 2010-11 • Provide ‘turn-key’ bunch-by-bunch FB system for • achievement of ATF2 goals: • 35 nm beam spot • stabilisation at nanometer level at IP • VITAL DEMONSTRATION OF FINAL-FOCUS CAPABILITY FOR ANY FUTURE LINEAR COLLIDER! • Contribute FB system design to CLIC CDR P.N. Burrows Project Review, Oxford, 11/12/09

  37. FONT plans: 2011-12 • FB tests using a long ILC-like train of 20-60 bunches at ATF2 • (FONT4 amplifier was specified to allow this) • Would allow us to investigate algorithm robustness: • account for bunch-bunch correlations along train • adaptive gain as beam conditions change (drift) • incorporate feed-forward information from upstream • fast (luminosity) scanning system? P.N. Burrows Project Review, Oxford, 11/12/09

  38. FONT plans: 2012-13 • Contribute FB system design, including relevant aspects of the machine-detector interface, to ILC TDR • CLIC: prototyping of drive beam phase stability feed-forward system; beam tests at CTF3 P.N. Burrows Project Review, Oxford, 11/12/09

  39. FONT plans > 2013 • Depends on STFC funding situation, • and on international developments for LC! • Ongoing simulations of luminosity performance of ILC + CLIC machines • Design of feedback and feed-forward systems • Phase stability feed-forward for CLIC drive beam • (CLIC TDR 2015?) P.N. Burrows Project Review, Oxford, 11/12/09

  40. Other opportunities • UK New Light Source (NLS): • will require high quality beam trajectory control through VUV-FEL undulator • Beam control in proton / ion accelerators for hadron therapy P.N. Burrows Project Review, Oxford, 11/12/09

  41. Resources • Faculty: Philip Burrows • Project staff: • RA (Christian, Resta Lopez) 2.0 • Electronic engineer (Perry) 1.0 • LCABD current grant (up to April 2011) • JAI grant (up to April 2012) • ZERO on PP RG • Accelerator science student: C. Swinson • Quota students: B Constance, R Apsimon, D Bett • CERN doctoral student: A. Gerbershagen P.N. Burrows Project Review, Oxford, 11/12/09

  42. STFC response 13/7/09 P.N. Burrows Project Review, Oxford, 11/12/09

  43. STFC response 13/7/09 P.N. Burrows Project Review, Oxford, 11/12/09

  44. STFC response 13/7/09 P.N. Burrows Project Review, Oxford, 11/12/09

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