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Precise and Fast Timing Network - a first view -

Precise and Fast Timing Network - a first view -. B. Jeanneret CTC , December 2009. Tolerance on Phase and Gradient. Luminosity and understanding/adjustment of the Beam Delivery and of the Final Focus, DB vs. MB. D.Schulte & R.Tomas , PAC09. Overall cycle.

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Precise and Fast Timing Network - a first view -

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  1. Precise and Fast Timing Network- a first view - B. Jeanneret CTC , December 2009

  2. Tolerance on Phase and Gradient • Luminosity and understanding/adjustment of the BeamDelivery and of the Final Focus, DB vs. MB D.Schulte & R.Tomas, PAC09 Overall cycle DB intertrain (or sector to sector) • Not muchmargin on these. i.e. • σϕ = 0.2o ΔL/L = -1% • σϕ = 0.4oΔL/L = -4% 1fs = 10-15 s Many contributions to : intrinsic + measurementerrors, twobeams , … On top : MB vs. MB : twicesmaller CLIC_TC,DEC_09,Time_network,BJ

  3. 326 klystrons 33 MW, 139 ms combiner rings Circumferences delay loop 72.4 m CR1 144.8 m CR2 434.3 m drive beam accelerator 2.38 GeV, 1.0 GHz CR1 CR1 1 km delay loop CR2 326 klystrons 33 MW, 139 ms drive beam accelerator 2.38 GeV, 1.0 GHz 1 km delay loop CR2 Feed-back box decelerator, 24 sectors of 868 m BDS 2.75 km BDS 2.75 km BC2 BC2 245m 245m IP1 e- main linac , 12 GHz, 100 MV/m, 20.85 km e+ main linac TA R=120m TA R=120m 47.9 km 83ps DB CLIC 3 TeV booster linac, 9 GeV, 2 GHz or 4 GHz ? BC1 MB e- injector 2.4 GeV e+ injector, 2.4 GeV TOL : 45fs e+ DR 365m e- DR 365m CLIC_TC,DEC_09,Time_network,BJ

  4. Timing and feed-back strategy in the tunnel D.Schulte et al,CLIC Note598 A.Andersson & J. Sladen EPAC06,TUPCH086 PAC07,MOPAN066 • To relax on δφ : feed-forward& back beforeenteringeach DECEL 9 GeV MB as a fastclock Timing line A B DB ∆t to: injectors DB & MB Damp. Rings MB TA DB TAs @50 Hz TA C E D MB to IP Phase from B, EnergyjitterδE from A&B, Phase correction for δE C&D, Phase error MB/DB , to synchronize theinjectorlinacs Open issue: frequency band of δE correction CLIC_TC,DEC_09,Time_network,BJ

  5. Fast & Precise timing network DL CR1,2 DB Linac TA Source 50m 1km 50m All this for σt = 15fs 24 x DECEL 500m? … 9Gev LTL EXP IP MB LTL MB TA Fback box 2km 20km Main Linac Boot Linac 2km Hererelaxed, tol must be set for full capture and match to damping time MB linac DR e+ DR e- Pre-DR e- 100m 1km Hereσt = 7.5fs to synchronize the twocomplex CLIC_TC,DEC_09,Time_network,BJ

  6. Long distance Cabling Issues • Thermal expansion of copper : • dL/L =αΔT= 1.7⋅ 10-5 ΔT • L = 100m , dL = δz = 5 mum ΔT =δz/α/L = 3 ⋅10-3 K • XFEL approach • Move to opticalfibers, withcontinuouslengthmeasurement (reflect signal to the emitter) • Lasers and specialfibers to producesolitonwaves CLIC_TC,DEC_09,Time_network,BJ

  7. Precise timing network • Little (or no) expertise on site as of today. • Complicatedopticalsystems • Expertise existsat XFEL (DESY,PSI) • Presentationsat CLIC09 : WG3 THURSDAY 11h00-12h30 • Long distance Optical Fiberswithfsresolution F. OemerIlday / BilkentUniv. Ankara • Overview of the Phase Measurement System at SLS/PSI Vladimir Arsov / PSI • Femtosecondopticalsynchronization system for FLASH Matthias Felber / DESY CLIC_TC,DEC_09,Time_network,BJ

  8. Open Issues • The whole timing network must afford a time resolution δt = 15fs (7.5 fs for a part) – to berefined • Which part must befast, i.eallow for intra-cycle feedback/correction ? • Which part needbepreciseonly, i.e. allow for inter-cycle analysis/diagnostics ? • In-house expertise to bebuilt-up • In parallel : explore source of errors • Measurementsproper • Slow movements • Vibrations (nearbytransformers, pulsedkickers, water turbulences, …) CLIC_TC,DEC_09,Time_network,BJ

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