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European Plans for ATF2 G.A. Blair LCPAC, KEK 24 th March 2006

European Plans for ATF2 G.A. Blair LCPAC, KEK 24 th March 2006. Overview CERN + LAPP EUROTeV UK France DESY. ATF2 EU Overview I. ATF2 EU Overview II. CERN Contributions & Plans for ATF/ATF2. contributions to ATF2 ‘studies’ hardware contributions

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European Plans for ATF2 G.A. Blair LCPAC, KEK 24 th March 2006

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  1. European Plans for ATF2G.A. BlairLCPAC, KEK24th March 2006 Overview CERN + LAPP EUROTeV UK France DESY

  2. ATF2 EU Overview I

  3. ATF2 EU Overview II

  4. CERNContributions & Plans for ATF/ATF2 • contributions to ATF2 ‘studies’ • hardware contributions • details of precision transformer BPMs • laser-Compton polarized e+ source From: Frank Zimmermann, CERN

  5. CERN ATF-2 “Studies” • development of commissioning strategy; • already wrote section of design report • 2) investigation of optimum beam-based alignment pro-cedures with pertinent specification of BPM ranges • 3) simulation of IP tuning and maximum tuning knob • ranges • 4) survey of relevant collective effects in ATF-2 • and ATF extraction line; particularly wake fields • 5) participation in commissioning activities 1 person month 3 person months 4 person months 1 person month in total: 1 person year approved by CSC on 13.10.2005 3 person months

  6. CERN ATF2 Hardware I • Active stabilization table including stabilizing feet • (STACIS2000 from TMC); • honeycomb structure with • length 2.4 m, width 0.8 m, height 0.8 m; • absence of structural resonance below 230 Hz • stabilizing feet are equipped with geophones, rubber pads for passive damping, and piezo-electric movers for active damping of load vibrations induced from the ground; • table was used for CLIC stabilization study; • presently on loan at Annecy; • available from mid-2006; • best use at ATF-2 to be identified; e.g.: • Stabilize final quadrupoles and IP monitors • value about 100,000 CHF (8.72 MYen)

  7. CLIC test stand for vibration measurements & magnet stabilization studies S. Redaelli, R. Assmann

  8. CERN/LAPP Contributions • LAPP will contribute the FD support system for all the four final focus magnets of QD0, SD0, QF1 and SF1 with the three dimensional analysis of the vibration there. • CERN provides the CLIC active table. • LAPP is also responsible of installation of the FD system and commissioning.

  9. Nano-BPM Built by SLAC group Nano-BPM Built by KEK group ~2m Oxford Stabilization of Focal Point • ATF2 program needs: Stabilization of Shintake monitor of 10nm with respect to final focus qudrupole. • Require to monitor on timescales of seconds and minutes →Laser interferometric straightness monitor. • StaFF group in Oxford is developing a straightness monitor for ILC. A setup using >20 distance meters will be tested at ATF during 2006-2007, with 20-30 nm expected resolution. D. Urner

  10. Oxford R&D for compact Straightness Monitor • ATF setup needed to test • Test distance meter (under accelerator conditions). • Combination of several measurements. • Test of Stabilization algorithms (using BPM movers). • Compact straightness monitor needed for ILC • Integration into one device harder – but allows system with much smaller vertical dimensions (few cm). • ATF2 ideal test facility. • Goal is to provide at least 10nm resolution (as required by ATF2). • Time frame 2009 anticipated. D. Urner

  11. CERN ATF2 Hardware II • Three precision transformer BPMs. • Projected spatial resolution 100 nm • Time resolution: 15 ns; • Aperture 4 mm (available at the end of 2007) • aperture might be increased within limits Advantages of transformer BPMs - arbitrary bunch spacing - large bandwidth (almost 6 decades) - simple readout electronics - insensitive to spray Development cost about 160,000 CHF (13.95 MYen) plus manpower; co-financed by EU via EUROTeV

  12. CERN BPM Design goals • Aperture: 4mm • Resolution: 100nm (CMMR > 92dB) • Absolute precision: 10μm • Rise time: <15ns • Dynamic range: ±1.5mm (15 bits) • Linearity error: < 1% • 24h stability: 1μm • Vibrations <100nm • Low frequency cutoff: 100kHz • High frequency cutoff: 30MHz • Bake out temperature: 150°C • Operating temperature: ~20°C • Vacuum: 10-9 Torr: Lars Soby

  13. Design Idea: Starting point: 40 mm aperture BPM (CTF-3): Aim:4mm aperture PBPM designed by M. Gasior, CLIC Note 572, DIPAC 2003 Lars Soby

  14. CERN also has great interest to participate further in a polarized e+ source based on Compton scattering Snowmass ILC proposal (T. Omori, J. Urakawa, E. Bulyak, P. Gladkikh, K. Moenig, …) uses Compton ring with 30 laser-beam IPs, stacking in main damping ring; modified scheme for CLIC benefits from smaller # bunches, smaller charge, high repetition rate, only 1 laser-beam IP, stacking in compact pre-damping ring yield in CLIC Compton ring vs. turn (E. Bulyak)

  15. ATF2 Laser-wire I • Build on experience at ATF extraction line • Multiple IPs for emittance measurement • Light transport studies, looking to ILC • Implementation of fast-scanning mechanisms. • Understand operational issues and input into ILC technical design. • Complementary programme at ATF and at DESY to address ILC operational issues.

  16. ATF2 Laser-wire II new dedicated IP Integrated BPM? Integrated wire scanner? Multi-dimension scans Light delivery Petra system

  17. ILC/ ATF2 Diagnostics Laser System Laser oscillator choice: • A conventional mode-locked Nd:YLF (1047 nm/1053nm) • or Nd: YAG (1064 nm) laser • or A mode-locked fiber laser (1047/1053/1064 nm) Laser Amplifier choice: High power diode pumped Nd:YLF or Nd:YAG Choice on 2nd harmonic crystal : LBO/BBO (250 nm – 500 nm) • System being investigated now (fiber laser attractive) • Will be built this year at Oxford • High power output will require further second stage • Could be used for laser-wire and Shintake at ATF2?

  18. BDSIM is a Geant4-based beamlne simulation toolkit Used for PETRA laser-wire (J. Carter) In use at ATF (L. Deacon) Plans for ATF2 L. Deacon (RHUL) O. Dadoun (LAL) (EUROTeV) Important to benchmark for ILC BDSIM simulation of ATF/ATF2 beamline http://flc.pp.rhul.ac.uk/bdsim.html

  19. FONT: Intra-train Feedback 67 ns 2002 2004 54 ns 23 ns 2005 FONT4 digital processor board P. Burrows

  20. France at ATF2 LAL-Orsay, LAPP-Annecy and LLR Polytechnique, together with 8 scientists from KEK, have just sent in a joint application (~€800k) to the newly created ANR (Agence Nationale de la Recherche) for project money to work on ATF-2 in the period 10/2006-9/2010. Result is expected in July 06. • Development and implementation of the beam • correction algorithms • Beam line modeling with an optimised version of the • GEANT4 simulation • Active stabilisation of critical mechanical support • structures for the final Focus • Development of specific beam instrumentation

  21. DESY at ATF2 • Stabilisation study for the FD system and the site (ground motion at the ATF2 floor) • Laserwire; interest in Compton detector and in data taking + analysis (part of EUROTeV) • Fast kicker to produce the ILC like bunch structure at ATF2 in the future. • DESY may also be interested in fabrication of magnets.

  22. Funding Programmes • Funded until Dec. 2007 • Includes ATF/ATF2: • CERN BPM, • Laser-wire • STAFF (stabilisation) • FONT, NanoBPM • BDSIM • Funded until Mar. 2007 • Includes ATF/ATF2: • Laser-wire • FONT, NanoBPM • BDSIM

  23. SUMMARY • A very active and fruitful collaboration involving • European partners at ATF/ATF2 • Plans are advanced for future participation in • Both the hardware and the running of ATF2 • BPM • Compton source • Laser-wire/Shintake • Lasers • Stabilisation • Feedback • Simulation/optimisation The next funding round is starting now …

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