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UK Beam Delivery System Project Status

UK Beam Delivery System Project Status. Linear Collider Accelerator + Beam Delivery Collaboration (LC-ABD). Philip Burrows Queen Mary, University of London. UK Beam Delivery System (BDS) Project. Aim: R&D to position UK to lead in design/supply of BDS

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UK Beam Delivery System Project Status

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  1. UK Beam Delivery System Project Status • Linear Collider • Accelerator + Beam Delivery Collaboration • (LC-ABD) Philip Burrows Queen Mary, University of London Philip Burrows LCUK Meeting, Lancaster 30/06/04

  2. UK Beam Delivery System (BDS) Project • Aim: R&D to position UK to lead in design/supply of BDS • Proposal peer-reviewed by PPRP 22 October 2003 • ‘Reconciliation’ process: PPARC/CCLRC/Institutes • Presented at JCBoard 12 January 2004 • Approved Science Committee January 27 2004 • £9M PPARC (£7.2M new + £1.8M RG) + £1.5M CCLRC • 1 April 2004 – 31 March 2007 Philip Burrows LCUK Meeting, Lancaster 30/06/04

  3. LC-ABD Collaboration • Abertay Bristol • Birmingham Cambridge • Durham Lancaster • Liverpool Manchester • Oxford Queen Mary • Royal Holloway University College London • Daresbury Lab. Rutherford-Appleton Lab. • Grahame Blair (PI), Philip Burrows (PM) • 41 post-doctoral physicists (faculty, staff, research associates) + technical staff + graduate students • + 23 new posts (16 to be filled) Philip Burrows LCUK Meeting, Lancaster 30/06/04

  4. LC-ABD Recruitment Drive Lord Sainsbury visits FONT at NLCTA June 8 2004 Philip Burrows LCUK Meeting, Lancaster 30/06/04

  5. Project Overview • Lattice design and beam simulations (Angal-Kalinin) • Advanced beam diagnostics (Blair) • Alignment and survey (Reichold) • Final focus luminosity stabilisation and spectrometry (Burrows) • Technology (Poole) Philip Burrows LCUK Meeting, Lancaster 30/06/04

  6. 1. BDS Lattice Design and Beam Simulations(Daresbury, Liverpool, Manchester, QMUL, RHUL, UCL) • 1.1 BDS Lattice design (Angal-Kalinin): • Forming an optics core team: working to improve the TESLA BDS • Design: • Expertise being developed for • Final Focus Optimisation (Collaboration with Saclay) • Beam Collimation (Collaboration with DESY) • Beam extraction and IR issues (Collaboration with Saclay, Orsay, DESY) • Beam-beam interactions • Codes for these studies have been implemented • 1.2 Beam transport simulations and backgrounds (Jones/White): • Ground motion • Damping ring to IP beam transport • Halo production and tracking through BDS • Backgrounds: pairs, gammas, neutrons … Philip Burrows LCUK Meeting, Lancaster 30/06/04

  7. Optics for small vertical crossing angle at TESLA Doublet Quadruplet Presented at LCWS04 and in TESLA collaboration & ELAN meetings Beam sizes of low energy tail particles at ~50m down the extraction line. Philip Burrows LCUK Meeting, Lancaster 30/06/04

  8. TESLA Extraction Line Studies • Redesign extraction line for new FF lattice: • Introduce finite IP angular dispersion as a correlation into the disrupted beam phase space. • Disrupted beam parameters generated using GUINEAPIG and tracking down the extraction line done using NLC version of DIMAD. Generated by tracking through final focus to IP Philip Burrows LCUK Meeting, Lancaster 30/06/04 vertical phase space horizontal phase space

  9. Future Work • Develop FFS optimisation procedure to third & fourth order. • Develop details of hybrid crossing angle designs for TESLA. • Reproduce TRC results on TESLA collimation. • Implement STRUCT for collimation. Compare STRUCT with MERLIN simulations. • Understand the NLC collimation optics design and compare with TESLA • Work out improved BDS optics solution for TESLA (beam switchyard, collimation, diagnostics section, extraction line design to save head-on scheme, final focus system). • Study the NLC/GLC optics to be able to contribute to any technology decision. Philip Burrows LCUK Meeting, Lancaster 30/06/04

  10. 1.2 Beam Transport Simulations (QMUL) • Damping ring - IP simulations (Glen White) • QMUL GRID cluster (128 nodes): • PLACET + MATMERLIN + GUINEAPIG/CAIN or • MATLIAR + GUINEAPIG/CAIN • Plan to include fast angle luminosity optimisation using crab cavity and wakefield effects of spoilers and collimators. • www respository for LC programs and data for ELAN BDYN work package. • Effect of jitter of nominal beam parameters on luminosity and beam-beam kick/FB system (Shah Hussain, Ph.D. Student) • Interaction region background simulations (Tony Hartin): • effect of EM backgrounds on FB components and the knock-on backgrounds produced in the vertex and tracking detectors. • Currently GEANT3, migration to GEANT4 under study. Philip Burrows LCUK Meeting, Lancaster 30/06/04

  11. Example: banana bunches, impact on FB • ‘Banana’ bunch (PLACET/MERLIN) Gaussian bunch Philip Burrows LCUK Meeting, Lancaster 30/06/04

  12. Beam Transport simulations (ASTeC) • Ground motion modelling: reproduce TESLA TDR ground • motion • Applying to new BDS with NLC like optics to confirm ok • MAD, TRANSPORT, BETA, TURTLE, DIMAD implemented. • MERLIN (with root graphics) for collimation simulations. • For Extraction line studies, GUINEAPIG & NLC version of • DIMAD implemented. BDS IP Dump ‘BDS-to-dump’ simulations start extraction end MERLIN DIMAD Mathematica Interface/control GP DIMAD Philip Burrows LCUK Meeting, Lancaster 30/06/04

  13. Tracking of halo energy deposition (BDSIM) Philip Burrows LCUK Meeting, Lancaster 30/06/04

  14. Executive Summary • Set up tools, and started serious work … • Task 1.1 • New Staff (ASTeC) - Rob Appleby, Frank Jackson – Liverpool RA – will be advertised soon • Task 1.2 • RHUL RA – advertised April’04 • Manchester RA – will be advertised soon Philip Burrows LCUK Meeting, Lancaster 30/06/04

  15. 2. Advanced Beam Diagnostics • 2.1 Laserwire (RHUL, Oxford, UCL): • Ongoing collaboration on PETRA laserwire project • UK building laser scanning system (multidirection) • Simulations: halo backgrounds, diagnostics layout • 2.2 Bunch longitudinal profile (Abertay, DL, Oxford): • Very successful electro-optic bunch length expt. at FELIX • R&D on Smith-Purcell radiation bunch profile monitor (Frascati) • possible deployment at FELIX • 2.3 Polarisation (Durham, Liverpool) Philip Burrows LCUK Meeting, Lancaster 30/06/04

  16. 2.1 Laser-wire • PETRA laser-wire produced first scans in December • 2003 • Major upgrades complete in: electronics, DAQ, • diagnostics and laser tuning. • Full simulations are improving and have shown the • need for a vacuum window • New run in July 04 • Start design of new vertical beam-line optical table • July 04 • New beam-pipe element with vacuum window is • currently being designed at DESY. Philip Burrows LCUK Meeting, Lancaster 30/06/04

  17. 79 ps 30 ps PETRA Milestones Construction + Installation PETRA March 03 First full scans Dec 03 σm =(68 ± 3 ± 20) μm at low PETRA current  laser pulse structure +full simulations  Studies ongoing and converging. Philip Burrows LCUK Meeting, Lancaster 30/06/04

  18. HR MIRROR λ/4 POCKELS CELL GATE F/4 FOCUSING POLARISING BEAMSPLITTER LASER e- BEAM 5mJ/50ps @ 0.5μm 420mm (1.4ns) ATF Extraction Line Laser-wire • June 04: Scope, Location and Laser • agreed with KEK. • First designs of vacuum chamber and • optics • 5 m electron spot-size, bunch spacing 2.8 ns. • Study jitter effects in environment similar to BDS. •  Advanced Optics • Vacuum vessel + • integrated diagnostics • + electronics + DAQ • Future location at ATF extraction line Philip Burrows LCUK Meeting, Lancaster 30/06/04

  19. 2.2 Bunch profile measurement: electro-optic F ~ ETHz Propagating electric field polariser chirped probe beam EO crystal Spectral decoding OR Temporal decoding Effective polarisation rotation proportional to coulomb field Philip Burrows LCUK Meeting, Lancaster 30/06/04

  20. Real time monitoring and bunch profile modification (FELIX measurements) Bunch profile modified by changing the buncher and accelerator phase. Philip Burrows LCUK Meeting, Lancaster 30/06/04

  21. Electro-optic Summary • ‘Low-resolution’ electro-optic bunch length measurement: • two data runs in last 6 months: 300 fs achieved • Spectral and temporal decoding techniques: • spectral has fundamental limitations (artefacts) • temporal entirely free of these effects -> sub 100 fs • Investigating FROG (frequency-resolved optical gating) techniques to characterise very short electron bunches. • Materials issues will come to the fore as we push towards shorter bunch lengths, and these issues are as yet unclear. • Paper submitted to PRL Philip Burrows LCUK Meeting, Lancaster 30/06/04

  22. 2.2 Bunch profile measurement: Smith-Purcell • Two pilot runs at FELIX in January and February • Preliminary results presented at the ELAN meeting, Frascati, May 2004. • Designed array of 11 far-infrared pyroelectric detectors: simultaneous detection of the radiated power over a wide range of wavelengths. Delivery is expected in about 4 weeks. • C.Perry has redesigned the detector electronics: increased bandwidth and 10X noise reduction. • The next run at FELIX may be in early October • Electromagnetic field calculations from periodic structures are continuing. • New student (V. Blackmore) will join Oxford in October. Philip Burrows LCUK Meeting, Lancaster 30/06/04

  23. 2.3 Polarisation Transport + Polarimetry • Detailed working discussions started. • See talk by G. Moortgat-Pick this afternoon. • About to advertise new RA position. Philip Burrows LCUK Meeting, Lancaster 30/06/04

  24. 3. Alignment and Survey (LiCAS)(Oxford) Internal FSI system Dz. & Dx,Dy & Da,Db between cars External FSI system measures wall marker location Straightness Monitor Dx,Dy & Da,Db between cars Philip Burrows LCUK Meeting, Lancaster 30/06/04

  25. New Collaborators • Johannes Prenting • Markus Schloesser • Ernst-Otto Saemann Gregorz Grzelak Andreas Herty CERN Micro Technology and Instrumentation section of SU group are interested joining RTRS and LiCAS development effort

  26. LiCAS Survey Car Design

  27. Laser Straightness Monitor Design • Invar body • 4*CCD camera • LSM beam returned by retro reflector • ≤6 internal FSI lines • ≥6 external FSI lines • unit is evacuated • bellow system allows for position and orientation adjustment • see external target • capture LSM beam

  28. LiCAS Hardware Development • Prototype survey car: • 2004: Single-car sensor • 2005: 3-car prototype deployed in dedicated 70m tunnel at DESY • 2007: 5-car prototype available for use in TESLA XFEL tunnel Prototype readout board Philip Burrows LCUK Meeting, Lancaster 30/06/04

  29. Laser enclosure 2nd tunable laser: short + long line FSI systems prototype two lasers in same line for drift compensationOptical tables: 3x1.5 m2: reference interferometry and frequency measurements long (5m): long line tests and single car test bed8 channels of fast ADCs: for long lines @ full tuning speed to be replaced by custom ADC boards Straightness Monitoring Long FSI test stages Motion control rack Vibration isolated optical table for FSI reference interferometers FSI rack USB-2 DAQ development 5 x 1.5 m2 table

  30. New FSI Work Splitter Tree Amplifier • Short 6-line FSI system for 3D wall marker reconstruction. Expect data August 04 Laser Retro Reflector 3D-Piezo Stage LiCAS update

  31. Car number Car number Car number 150 Random-Walk Model 100 SIMULGEO Result 50 0 80 60 40 0 20 40 60 80 20 0 0 100 200 300 400 500 600 Z-position [m] Reference marker position [m] Fig 1: SIMULGEO Error propagation for a single Stop of the RTRS in mm and mrad m m m Sigma [m] Sigma [m] Sigma [rad] m m Sigma [m] Y-position [m] m Y-residual [m] Fig 3: Residuals between 1000 random walk Simulations and a straight line over 600m Fig 2: SIMULGEO Error propagation over 15 stops and fit of random walk model & 600m extrapolation

  32. Ongoing Work • LSM: • Setting up 6-DOF 5m test and calibration system with 4 cameras in realistic geometry • New analytical model of calibration procedure • SIMULGEO simulation of calibration procedure • FSI • Setting up 0-5m long single line test stand for beam profiling & acceptance measurements • EuroTeV, WP = METSTB • Additional funds for stabilisation work + collaboration with LAPP

  33. 4. Beam-based Feedback + BPM/Spectrometry(DL, Cambridge, Oxford, QMUL, UCL) • Intra-train beam feedback is last line of defence against ground motion Energy precision < 10**- 4 BPM stability/timing Philip Burrows LCUK Meeting, Lancaster 30/06/04

  34. International Fast Feedback Collaboration • FONT: • Queen Mary: Philip Burrows, Glen White, Tony Hartin, • Stephen Molloy, Shah Hussain, Christine Clarke + 2 new staff • Daresbury Lab: Alexander Kalinine, Roy Barlow, Mike Dufau • Oxford: Colin Perry, Gerald Myatt, Simon Jolly, Gavin Nesom • SLAC: Joe Frisch, Tom Markiewicz, Marc Ross, Chris Adolphsen, Keith Jobe, Doug McCormick, Janice Nelson, Tonee Smith, Steve Smith, Mark Woodley, Linda Hendrickson • FEATHER: • KEK: Nicolas Delerue, Toshiaki Tauchi, Hitoshi Hayano • Tokyo Met. University: Takayuki Sumiyoshi, Fujimoto • Simulations: Nick Walker (DESY), Daniel Schulte (CERN), A. Seryi (SLAC) Philip Burrows LCUK Meeting, Lancaster 30/06/04

  35. Beam Feedback Luminosity Recovery Position scan: Angle scan: • G/NLC: • recover > 80% of • design luminosity TESLA: > 95% feasible Philip Burrows LCUK Meeting, Lancaster 30/06/04

  36. FONT2: beamline configuration Dipole and kickers New BPMs Philip Burrows LCUK Meeting, Lancaster 30/06/04

  37. FONT2 results (Jan 04): feedback BPM Beam starting positions Beam flattener on Feedback on Delay loop on Latency 53ns Philip Burrows LCUK Meeting, Lancaster 30/06/04

  38. Next steps: ATF extraction line (KEK) • control 1 GeV beam at 1 micron level =>same kicker amplifier and BPM technology as control of LC beam at nm level • FONT3 tests at KEK (June 04): • characterise beam jitter and test • superfast BPM system: < 20 ns • FONT3 closed-loop runs • spring/summer 2005 Philip Burrows LCUK Meeting, Lancaster 30/06/04

  39. 2006: ‘Nano’ Project at KEK ATF UK: FONT-style feed-forward and/or feedback Philip Burrows LCUK Meeting, Lancaster 30/06/04

  40. BPMs BPMs Moveable Stage Girder 5m Figure 1. Sketch of the BPM girder and BPM locations. Plans for BPM Spectrometry: T- 474 (SLAC)(Cambridge, UCL, DL) • UK: BPM stage • Run June 2005 • Hiring 2 RAs Philip Burrows LCUK Meeting, Lancaster 30/06/04

  41. 5.1 Technology: Polarised e+ Undulator (Daresbury, Liverpool) • Polarised positron undulator design: • Baseline method for TESLA, in consideration for NLC • Polarised e+ -> helical undulator (E166 expt / SLAC) • Design work for TESLA helical undulator in progress: • Detailed engineering design, prototyping, test with beam Philip Burrows LCUK Meeting, Lancaster 30/06/04

  42. 5.2 Crab Cavity (Daresbury, Lancaster) • Setting up design team • RA to be recruited • – based at Cockcroft • Study of cavity parameter requirements • Build prototype cavity with power source • Test cavity – phase stability • Engineered design for LC Philip Burrows LCUK Meeting, Lancaster 30/06/04

  43. 5. 3 Collimation(Birmingham, Daresbury, Lancaster, RAL) • Collimation Region Design • concentrate on (poorly understood) transverse wakefields • Scope adjusted to fit resources (largely CCLRC): advertise RA (L’cr) • design and simulation of novel spoiler profiles • extension of modelling into long structure/short pulse region • "cold" tests: short pulse down wire along centre of structure; frequency scan • beam test with SLAC ‘death ray’ wakefield box • simulation of damage to spoiler materials • Addition of proposed EUROTEV funding would allow: • more wakefield simulation/modelling • material damage studies (allow hardware tests) • collaboration with CERN, TEMF Philip Burrows LCUK Meeting, Lancaster 30/06/04

  44. Summary and Outlook • Embarked on a substantial UK LC BDS project • Huge amount of work in progress! • Aiming to build a strong, coherent design team: • aim to be major player in Global Design Office (start 2005) • aim to prepare UK funding agencies for a UK LC contribution • Collaborating w. European partners via ‘Framework 6’ programme: • funded ELAN LC ‘network’ to facilitate collaboration • Eurotev ‘design study’ proposal: favourably reviewed Philip Burrows LCUK Meeting, Lancaster 30/06/04

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