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Feedback On Nanosecond Timescales (FONT):

Beam feedback and phase FF. Feedback On Nanosecond Timescales (FONT): Robert Apsimon, Philip Burrows, Neven Blaskovic, Douglas Bett, Glenn Christian, Michael Davis, Davide Gamba, Alexander Gerbershagen, Young Im Kim, Colin Perry, Jack Roberts John Adams Institute Oxford University.

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Feedback On Nanosecond Timescales (FONT):

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  1. Beam feedback and phase FF Feedback On Nanosecond Timescales (FONT): Robert Apsimon, Philip Burrows, Neven Blaskovic, Douglas Bett, Glenn Christian, Michael Davis, Davide Gamba, Alexander Gerbershagen, Young Im Kim, Colin Perry, Jack Roberts John Adams Institute Oxford University

  2. Oxford k-contract • WP1: design of FB and control systems • 17 + 21 staff months + £58k • WP2: design of FF systems • 23 + 33 staff months + £165k • WP3: design of laserwire systems • 6 + 12 staff months + £21k • Total:46+ 66 staff months + £244k • Key:UK, CERN

  3. WP3: design of laserwire • Laser Wire Scanner for Profile Measurements on the CLIC Drive Beam - PETRA • Exploitation of LWS facility at PETRA 3 in DESY • Design a laser wire scanner system adapted to the Drive Beam requirement (2.4GeV, 20um resolution) • Implement an electro-optically driven fast scanning system by shipping out a mode-locked laser system from RHUL to DESY and validate the concept of fast scanning for Drive Beam trains as long as 140us • Laser Wire Scanner for Profile Measurements on the CLIC Main Beam – ATF2 • Exploitation of LWS facility at ATF2: Use nearby BPM and subtract beam position jitter form the LWS scans • Design of the CLIC MB Laser Wire at different beam energies along the complex (2.4GeV, 9GeV, 1.5TeV) - Study the different detection scheme and laser system implications • Fibre laser developments for cost reduction and implementation in CLIC infrastructure • In close relation with industry, follow and test the performance of fibre lasers in term of beam quality and laser power. • Test of high power fibre laser in the accelerator environment (ATF2) • Define the implementation of laser system for LWS in CLIC Complex (Drive beam and Main beam)

  4. WP1: FB and control • Simulation, design and prototyping of IP (and interface with related BDS) beam steering feedback systems for luminosity stabilisation and optimisation at CLIC. • Integration of components within Machine Detector Interface (MDI) design. • Completion of the ATF2 prototype systems as part of the ATF2 collaboration goals of 37nm beam size and nm-level beam stabilisation. • Bench testing of relevant components for CLIC prototypes, and exploration of the possibility of beam tests of prototype components at CTF3. • Provision of feedback system parameters for modeling the integrated performance of feedback and feed-forward systems in the global CLIC design.

  5. WP1: FB and control • Simulation, design and prototyping of IP (and interface with related BDS) beam steering feedback systems for luminosity stabilisation and optimisation at CLIC. • Integration of components within Machine Detector Interface (MDI) design. • Completion of the ATF2 prototype systems as part of the ATF2 collaboration goals of 37nm beam size and nm-level beam stabilisation. • Bench testing of relevant components for CLIC prototypes, and exploration of the possibility of beam tests of prototype components at CTF3. • Provision of feedback system parameters for modeling the integrated performance of feedback and feed-forward systems in the global CLIC design.

  6. WP1: FB and control • Simulation, design and prototyping of IP (and interface with related BDS) beam steering feedback systems for luminosity stabilisation and optimisation at CLIC. • Integration of components within Machine Detector Interface (MDI) design. • Completion of the ATF2 prototype systems as part of the ATF2 collaboration goals of 37nm beam size and nm-level beam stabilisation. • Bench testing of relevant components for CLIC prototypes, and exploration of the possibility of beam tests of prototype components at CTF3. • Provision of feedback system parameters for modeling the integrated performance of feedback and feed-forward systems in the global CLIC design.

  7. CLIC Final Doublet Region

  8. CLIC Final Doublet Region

  9. CLIC Final Doublet Region

  10. WP1: FB and control • Simulation, design and prototyping of IP (and interface with related BDS) beam steering feedback systems for luminosity stabilisation and optimisation at CLIC. • Integration of components within Machine Detector Interface (MDI) design. • Completion of the ATF2 prototype systems as part of the ATF2 collaboration goals of 37nm beam size and nm-level beam stabilisation. • Bench testing of relevant components for CLIC prototypes, and exploration of the possibility of beam tests of prototype components at CTF3. • Provision of feedback system parameters for modeling the integrated performance of feedback and feed-forward systems in the global CLIC design.

  11. CLIC IP FB model

  12. CLIC IP FB performance Single random seed of ground motion (Model C): beam tracked through whole CLIC complex Many seeds of ground motion, and Models A, B, C, K:

  13. IP FB documented in CDR • 3.6 Machine-Detector Interface (p. 167) • 3.8 Integrated simulations on low-emittance preservation (p. 191) • 5.12Machine-Detector Interface (p. 552) • 5.15 Real-time feedback equipment (p. 583)

  14. WP1: FB and control • Simulation, design and prototyping of IP (and interface with related BDS) beam steering feedback systems for luminosity stabilisation and optimisation at CLIC. • Integration of components within Machine Detector Interface (MDI) design. • Completion of the ATF2 prototype systems as part of the ATF2 collaboration goals of 37nm beam size and nm-level beam stabilisation. • Bench testing of relevant components for CLIC prototypes, and exploration of the possibility of beam tests of prototype components at CTF3. • Provision of feedback system parameters for modeling the integrated performance of feedback and feed-forward systems in the global CLIC design.

  15. FONT5 installation at ATF2 ATF2 extraction line 15

  16. FONT5 operation at ATF2 • Aim to stabilise beam in IP region using 2-bunch spill: • 1. Upstream FB: monitor beam at IP • 2. Feed-forward from upstream BPMs  IP kicker • 3. Local IP FB using IPBPM signal and IP kicker 16

  17. Upstream FONT5 System Analogue Front-end BPM processor FPGA-based digital processor Kicker drive amplifier Beam Strip-line kicker Stripline BPM with mover system

  18. Interaction Point FONT System Analogue Front-end BPM processor FPGA-based digital processor Kicker drive amplifier Beam • Designed in house • 12.5 cm stripline kicker • Based on ATF stripline BPMs Strip-line kicker Cavity BPM

  19. ATF2 beam stabilisation results • Upstream FB: beam stabilised at IP to • ~ 300 nm • 2. Feed-forward: beam stabilised at IP to • ~ 106 nm • 3. IP FB: beam stabilised at IP to ~ 93 nm • Getting interesting! (i.e. hard)

  20. Upstream FB (Measured at IPB) FB Off Correlation: 79% FB On Correlation: 14% FB Off Jitter: 0.35 ± 0.02 μm FB On Jitter: 0.30 ± 0.01 μm

  21. Feedforward Results FF Off Correlation: 73% FF On Correlation: 23% FF Off Jitter: 160 ± 10 nm FF On Jitter: 106 ± 10 nm

  22. IP Feedback Results FB Off Correlation: 81% FB On Correlation: -16% FB Off Jitter: 170 ± 10 nm FB On Jitter: 93 ± 4 nm

  23. WP1: FB and control • Simulation, design and prototyping of IP (and interface with related BDS) beam steering feedback systems for luminosity stabilisation and optimisation at CLIC. • Integration of components within Machine Detector Interface (MDI) design. • Completion of the ATF2 prototype systems as part of the ATF2 collaboration goals of 37nm beam size and nm-level beam stabilisation. • Bench testing of relevant components for CLIC prototypes, and exploration of the possibility of beam tests of prototype components at CTF3. • Provision of feedback system parameters for modeling the integrated performance of feedback and feed-forward systems in the global CLIC design.

  24. Future work proposal • Optimisation of the performance of ATF2 feedback systems as part of the ATF2 collaboration goals of 37nm beam size and nm-level beam stabilisation. • Optimised design of CLIC IP (and interface with related BDS) beam steering feedback systems for luminosity stabilisation and optimisation. • Integration of component designs within Machine Detector Interface (MDI) design. • Where relevant, bench testing of prototypes: drive amplifiers, signal processors, feedback boards. • Beam tests of prototype systems at ATF2 and CTF3. • With task 2.1: simulation of the integrated performance of feedback (and feed-forward) systems in the global CLIC design.

  25. Future work proposal (1) • Optimisation of the performance of ATF2 feedback systems as part of the ATF2 collaboration goals of 37nm beam size and nm-level beam stabilisation: • Tuning shifts at ATF2 (tuning tools – Rogelio et al) • Commission new IP chamber (with LAL, KNU, KEK) • Understand new C-band cavity BPMs + signal processors • Implement new BPMs into IP FB loop • Push beam stabilisation 100nm  10nm ( 1nm??)

  26. Future work proposal (2) • Optimised design of CLIC IP (and interface with related BDS) beam steering feedback systems for luminosity stabilisation and optimisation. • Integration of component designs within Machine Detector Interface (MDI) design. • More realistically-engineered design: • Radiation hardness of electronics • (evaluation of backgrounds) • Cabling + shielding • RF interference • Larger L* would require a • complete re-design

  27. Future work proposal (3) • Where relevant, bench testing of prototypes: drive amplifiers, signal processors, feedback boards. • Beam tests of prototype systems at ATF2 and CTF3. • With task 2.1: simulation of the integrated performance of feedback (and feed-forward) systems in the global CLIC design.

  28. Future proposed FB resources • Faculty: Burrows, Christian • Electronic engineer: Perry • Postdoc: Vice Bett • (working jointly on phase feed-forward) • Existing student: Blaskovic • New student: TBD

  29. WP2: drive beam phase FF • Simulation, design and prototyping of components for feed-forward systems for correcting phase instabilities in the CLIC drive beam. • Integration of components within CLIC drive beam design. • Liaison and coordination with collaborators working on related systems, in particular the phase monitors and kickers. • Development and bench testing of relevant prototypes and components, in particular for the high-power kicker drive amplifiers. • Study for possible beam tests of prototypes at CTF3.

  30. WP2: drive beam phase FF • Simulation, design and prototyping of components for feed-forward systems for correcting phase instabilities in the CLIC drive beam. • Integration of components within CLIC drive beam design. • Liaison and coordination with collaborators working on related systems, in particular the phase monitors and kickers. • Development and bench testing of relevant prototypes and components, in particular for the high-power kicker drive amplifiers. • Study for possible beam tests of prototypes at CTF3.

  31. WP2: drive beam phase FF • Simulation, design and prototyping of components for feed-forward systems for correcting phase instabilities in the CLIC drive beam. • Integration of components within CLIC drive beam design. • Liaison and coordination with collaborators working on related systems, in particular the phase monitors and kickers. • Development and bench testing of relevant prototypes and components, in particular for the high-power kicker drive amplifiers. • Study for possible beam tests of prototypes at CTF3.

  32. Phase FF documented in CDR • 4.3 Beam transport (p. 250) • 5.15 Real-time feedback equipment (p. 585)

  33. WP2: drive beam phase FF • Simulation, design and prototyping of components for feed-forward systems for correcting phase instabilities in the CLIC drive beam. • Integration of components within CLIC drive beam design. • Liaison and coordination with collaborators working on related systems, in particular the phase monitors and kickers. • Development and bench testing of relevant prototypes and components, in particular for the high-power kicker drive amplifiers. • Study for possible beam tests of prototypes at CTF3.

  34. WP2: drive beam phase FF • Simulation, design and prototyping of components for feed-forward systems for correcting phase instabilities in the CLIC drive beam. • Integration of components within CLIC drive beam design. • Liaison and coordination with collaborators working on related systems, in particular the phase monitors and kickers. • Development and bench testing of relevant prototypes and components, in particular for the high-power kicker drive amplifiers. • Study for possible beam tests of prototypes at CTF3.

  35. WP2: drive beam phase FF • Simulation, design and prototyping of components for feed-forward systems for correcting phase instabilities in the CLIC drive beam. • Integration of components within CLIC drive beam design. • Liaison and coordination with collaborators working on related systems, in particular the phase monitors and kickers. • Development and bench testing of relevant prototypes and components, in particular for the high-power kicker drive amplifiers. • Study for possible beam tests of prototypes at CTF3.

  36. Future work proposal • Develop feedback boards and amplifiers for CTF3 phase feed-forward prototype system. • Commission CTF3 prototype feed-forward system with beam. • With beam experience, optimise component design and test modified components. • Apply experience gained from CTF3 prototype to CLIC drive beam design, including performance simulations.

  37. Future proposed FF resources • Faculty: Burrows, Christian • Electronic engineer: Perry • Postdoc: Vice Bett • (working jointly on beam feed-back) • Existing students: Roberts, Gamba • New student: TBD

  38. Oxford resources (1/4/11-31/3/14) • Oxford-k CERN-kactual • Staff effort (months): 4666163 • Burrows, Christian 54 • Christian, Kim, Bett, Corner, Nevay73 • Perry 36 • PhD students (months): • Apsimon, Bett, Davis, Blaskovic 102 • Gerbershagen, Roberts, Gamba 57 • Materials + travel (k£): 0244 465

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