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T. Lefevre, CERN BE/BI CTC – 7 th of July 2009

CLIC. Outcome of the CLIC BI Workshop. Workshop in numbers Status of the R&D Perspective & Conclusion. 48 persons registered + few CERN colleagues. T. Lefevre, CERN BE/BI CTC – 7 th of July 2009. Workshop Mandate.

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T. Lefevre, CERN BE/BI CTC – 7 th of July 2009

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  1. CLIC Outcome of the CLIC BI Workshop • Workshop in numbers • Status of the R&D • Perspective & Conclusion 48 persons registered + few CERN colleagues T. Lefevre, CERN BE/BI CTC– 7th of July 2009

  2. Workshop Mandate • Present an overview of CLIC beam instrumentation need and review their specifications : (8 talks : still few things to be discussed with BD) • Present the status of the on-going R&D related to CLIC beam instrumentation : (17 talks covering most of the CLIC instrumentation) • Review the list of critical items and discuss the R&D required for proof of principle (3h Discussion session) • Organize the work for completion of the CLIC Conceptual Design Report with a cost estimate by the end of 2010 (follow-up on collaborations)

  3. CLIC CDR CLIC • 1- Collect the beam instrumentation requirements for each CLIC sub-systems and identify Critical Items and the need for new R&D • 2- Evaluate the performance of already-existing technologies • CLIC specific instruments • Luminosity monitors • Beam loss monitor / MPS • CTF3 beam diagnostics – importable to CLIC • ILC instruments with similar requirements as for CLIC • Laser Wire Scanner or Cavity BPM • Beam Delivery System instrumentation • Ex: Polarization monitor, Beam Energy measurements • Damping ring instrumentation developed at ATF2 • 3rd and 4th generation light sources • Damping ring instrumentation • Bunch Compressor instrumentation very similar to XFEL projects • Short bunch length and Timing synchronization

  4. CLIC Beam Position Measurements with a 50nm resolution and adequate time resolution

  5. Cavity BPM @ FERMILAB CLIC Mode TM11 • Work in progress - Design finalized by October 2009 – Prototype 2010 ? Design of Low-Qlowcostcavity BPM (stainlesssteel) A. Lunin and M. Wendt

  6. CLIC Reentrant Cavity BPM at CTF3/CALIFES 6 BPMs are installed on the CTF3 probe beam Reentrant Part • Design for CLIC parameter and frequency • Single bunch and multi-bunches modes • Single bunch resolution potential < 1 µm C. Simon

  7. ‘yet another high resolution BPM’ CLIC Monopole mode TM01 f=7.8GHz Q0=7 TM01 TM11 RF absorber QL=1000 Dipole mode TM11 f=12GHz Q0=1600 (Copper) Spectrum of the port signal (single bunch) TM11 TM01 WG cutoff Frequency Slotted cavity Choke cavity I. Syratchev – R. Fandos

  8. ‘yet another high resolution BPM’ CLIC Slotted cavity BPM Choke BPM Transverse modes Longitudinal modes Transverse modes Longitudinal modes May befollowed by RHUL with a DitanetPh.D Internal single bunch resolution 500 micron ~ 1 micron The two port pairs combination through the hybrid normally reduces the signals induced by the longitudinal modes by at least 20 dB ~ 10 nm Single bunch resolution without post processing 5 micron I. Syratchev – R. Fandos

  9. CLIC Beam Size Measurement with a micron accuracy

  10. Micron resolution with Laser Wire Scanner CLIC Optimized to measure 20umx1um beam spot size • High energy green (λ=532nm) laser pulses • Amplify a single pulse frompassivelymode-lockedseed laser • Frequencylocked to ATF RF distribution system at 357MHz • Pulse duration ~150ps ; Pulse energy ~30mJ • Laser light istransportedcollimated to extraction line by series of mirrors and alignedusing irises Best Laser focus s ~ 2.2um Need to improve the laser spot size by factor 2-3 Improving the optic and laser quality Detector ATF Extraction line Laser Best scan s ~ 3.9um ATF Damping Ring L. Deacon & co

  11. CLIC Bunch length Measurement with a 30 fs resolution

  12. Benchmarking EO at FLASH against LOLA CLIC E = 450 MeV, q = 1nC~20% charge in main peak Single-shot Temporal Decoding (EOTD) W.A. Gillespie & co

  13. Benchmarking EO at FLASH against LOLA CLIC with FLASH bunch compressors detuned Optimum compression Fitted Gaussian curve sigma = 79.3 ± 7.5 fs Physical Review Special Topics - Accelerators and Beams 12, 032802 (2009) W.A. Gillespie & co

  14. Benchmarking EO at FLASH against LOLA CLIC Transverse deflecting cavity(destructive) EO temporal decoding (non-destructive & compact) • AchievedResolutionis fine • Perturbation due to Wakefield to beinvestigated wakefields Physical Review Special Topics - Accelerators and Beams 12, 032802 (2009) W.A. Gillespie & co

  15. CLIC 20-50fs timing synchronization

  16. 20-50fs timing synchronisation CLIC Beam induced signal Drive beam 12 GHz Resonant volume RF noise RF noise Multi-moded rejection filters 12 GHz electronics (A. Andersson) - Use mixers directly at 12 GHz - Use an array of many devices, sum their outputs for a reduction in noise Full demonstration by the end of 2012 12 GHz low impedance noise-free pick-up concept by I. Syratchev, to be followed by M. Marcellini within FP7-EuCARD Sapphire Loaded Cavity Oscillator with ~2 fs integrated phase noise. • Stable distribution of low frequency reference for long term stability • Low noise local oscillator at each turnaround

  17. CLIC Post collision line • Post collision line • Ferrari, V. Ziemann – ? • E. Gschwendtner – K. Elsener • Complex and non-standardbeam line • Luminosity monitors based on beamstrahlung photons detection • Intensity monitors • Interferometric dump thermometer • Tails monitors and/or instrumentedcollimators

  18. Beam loss monitors : Simulations CLIC • Work as just started • Plan to have functional specifications for the CDR by 2010 • For the Cost estimate • Choice of Technology (Cerenkov emission in Optical fiber, Ionization chambers, …) • Investigation of Safety Integrity Level (Need for redundancy ?) Fluka simulation along the CLIC main linac B. Holzer

  19. CLIC 3TeV – Numbers of devices CLIC Drive Beam 47155 devices No Beam Loss Monitors specified yet Main Beam 8292 devices + 142812 wakefield monitors

  20. Number of devices CLIC • For large scale distributed systems : > 100 (Position - Loss - Size ) • Simplicity where possible and Standardisation • Cost effective • Maintainability • Robustness and Final working environment • Availability • Reliability • ( LEP BPM reliability 99%, LHC Better ?) R. Jones

  21. Number of devices CLIC • Electronic Standardisation • Single type of digital electronics acquisition card used for the majority of LHC instruments • Design more complicated • Needs from many users • Small changes affect many systems • Gain in efficiency (many users for debugging – faster software development) • Cheaper production • Follow similar concept for CLIC • Elimination of cables • Standardized Digital Acquisition on local crate with single connection via synchronous ethernet for timing/clock (White Rabbit – BE/CO - Javier Serrano) • Radiation hardness ? S. Vilalte, J. Jacquemier, Y. Karyotakis, J. Nappa, P. Poulier, J. Tassan R. Jones

  22. CLIC Instrumentation and ressources • Development on Beam loss monitors : No specification so far • Recent collaboration with University of Liverpool - Cockcroft Institute for Beam loss detection technique based on Optical fiber • Recent collaboration with Greece : Students for beam loss shower simulations • CLIC Project Associate (Mariuzs Sapinski) starting in Oct 2009. • Development of micrometer beam size monitor • JAI-RHUL and Oxford University colleagues involved in ATF2/PETRA laser wire scanner program • 1 micron accuracy to be demonstrated (current achievement 2-3 microns) • Study the use of LWS for the Drive Beam Complex (easy for top energ but optimize the design for a cheap solution) • - Development of short bunch length monitoring techniques • INFN-Frascati for RF deflector techniques : Longitudinal Profile but limited to low energy (and expensive) • University of Dundee for Electro-optics techniques : Longitudinal Profile • resolution to be studied @ Flash/LCLS (current status 20fs) • Northwestern University using RF pick-up techniques: Form Factor for DB complex : Test resolution in TBL • JAI-RHUL for Coherent Diffraction radiation techniques: Form factor for DB/MB complex : Test resolution in TBL • Development of Beam Position Monitors • FNAL collaboration for 50nm resolution BPM : Low cost Cavity BPM • CEA/IRFU for re-entrant cavity BPM • CLIC Project Associate (Steve Smith from SLAC) for one year : Work on DB Decelerator BPM • JAI-RHUL for BPM development : 1 Ph.D student and few staff part time : Choke type Cavity BPM /Wakefield monitor ? • IFIC Valencia for Drive Beam Decelerator : Scale CTF3 Inductive BPM to CLIC Needs • INFN-Frascati for Drive Beam delay loop and combiner rings : Not really active at the moment • Development of Wakefield monitors by CEA/IRFU (Frank Peauger) Would need help from RHUL – maybe ? • Development of emittance and energy spread measurement devices with PSI • Development of post collision line monitor (luminosity monitor) by Uppsala university • Need for a CLIC Project Associate ? • Beam synchronization implies a 0.1deg at 12GHz phase measurement with an adequate feed-forward system • Activity not follow-up by the BI group (RF group and FP7-Eurocard/NCL) • Electronic development for Large distributed systems: Need to prepare specifications to be included withtin a global standardization effort (module) • LAPP for the acquisition system (rad-hard analog and digital solutions) • University Politecnica de Catalunya for rad-hard analog electronic

  23. Perspectives & Conclusions CLIC • Specifications for BI in rather good shape:Still waiting for specifications for beam loss monitoringSome further clarifications with beam dynamics experts needed • For all demands technical solutions exist (within a factor 2...3) • Complex and non standard Post-collision beam line • High number of instruments: Cost optimization will be needed • Cost optimization and prototyping (this will be the main activity in the 2011 – 2016 CLIC TDR phase) • Simplicity if applicable (not always compatible with tight tolerances) • Standardization (detectors, electronics) is a key concept • Gain in Mass production ?

  24. Follow-up on collaboration • RHUL • Continue the work on LWS and short bunch length monitoring • Start working on Wakefield monitor and/or Choke Cavity BPM • FNAL • Lost cost low-Q cavity BPM : Money / MoU? • CEA : • The design of re-entrant cavity for the CLIC Main linac (low-Q, high bandwidth) • Help for Wakefield monitor design • ESRF : • Expertise of PDR & DR instrumentation • University of Dundee / PSI • E-O optics sampling : Revised specifications / collaboration in preparation

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