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EUROdrive and LED

EUROdrive and LED. Motivation Work Packages Partners & resources. Motivation. Linear colliders are the best way to achieve high energy electron positron collisions Two studies are being followed ILC, for a centre-of-mass energy of 0.5TeV with some upgrade potential

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EUROdrive and LED

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  1. EUROdrive and LED • Motivation • Work Packages • Partners & resources Daniel Schulte: EUROdrive and LED

  2. Motivation • Linear colliders are the best way to achieve high energy electron positron collisions • Two studies are being followed • ILC, for a centre-of-mass energy of 0.5TeV with some upgrade potential • CLIC, for a centre-of-mass energy of 3TeV • Preserving the beam quality during transport is a challenge in these machines • In the main linac • In the drive beam complex of CLIC • In the beam delivery system • EUROdrive addresses the drive beam issues • CTF3 is being constructed at CERN • LED focuses on stability of main beam transport • Originally contained luminosity instrumentation • The two JRAs will be merged, also with the one on high gradients Daniel Schulte: EUROdrive and LED

  3. History (Sorry) • Original letters of intent were focused on most critical CLIC issues • Budget 10.4MEuro • Scientifically and technically sound programme • Original scope had been reduced anticipating EU funding level • ILC had not submited letters of intent • Requested input on synergy topics for LED was not given until late • Finally ILC contributions came in a rush • Scope has increased dramatically • Lots of proposals have not been discussed • Thanks to Phil who smoothened the process as much as possible • Budget proposed by Erk Jensen is 6MEuro (3+3) • Even too little for original proposals • Need to critically review the new proposals • Will have a technical review of the resources foreseen for each task • but still hard decisions seem necessary Daniel Schulte: EUROdrive and LED

  4. CTF3 Beam Studies • Concern: • Drive Beam performance of CTF3 and CLIC • Drive beam is very special • Large beam loading • High current (about 100A) • Objective: • Improve CTF3 operation • Test automatic alignment, tuning and measurement procedures foreseen for CLIC in CTF3 • Work programme (INFN, CERN, PSI, IFIC) • Develop alignment, tuning and measurement procedures for CLIC and CTF3 (INFN, IFIC, CERN) • Provide implementation platform (CERN) • Implement and test them at CTF3 • Benchmark coherent synchrotron radiation at CTF3 (PSI, CERN) Daniel Schulte: EUROdrive and LED

  5. Phase Monitor • Concern: • Drive beam phase errors can critically impact the luminosity performance of CLIC • They are coherent along the main linac • Need phase feedback • High beam current • Objective: • Investigate a potential low impedance phase monitor • 20fs resolution • Work programme: (INFN, PSI, CERN) • Design, build and test low impedance monitor with filter (CERN, INFN) • Test at CTF3 • Complementatry system: Build wide band monitor and electro-optical system to measure bunch phase (PSI) • Test at XFEL injector Daniel Schulte: EUROdrive and LED

  6. Loss Monitor • Concern • Loss monitors are an important part of the machine protection and will be important for CLIC operation • Two beam lines that are close will make it difficult to localise losses • Objective • Explore the potential of a loss monitor that can be tuned to detect losses above an energy threshold • Work programme (Heidelberg, RHUL, CERN) • Build fiber based loss monitors (to be installed in CTF3) to perform calibration measurements • Build monitors that can be tuned to have different energy thresholds (Cherenkov based) • Perform measurements in CTF3 • Benchmark with simulations (RHUL, listed in LED) Daniel Schulte: EUROdrive and LED

  7. Stabilisation • Concern: • The CLIC luminosity performance critically depends on • The main linac quadrupole stability (<1nm @ 1Hz) • The final doublet stability (<0.1nm @ 4 Hz) in noisy site • Issues are noise and demagnification • Also important for ILC and XFELs • Objective: • Explore the potential to reach 0.1 nm stability above 4Hz in the final quadrupoles • Explore the potential to reach 1nm stability above 1Hz in the accelerator environnement • Develop alignment monitoring for ILC BDS • Develop mover system with high stability for PSI XFEL Daniel Schulte: EUROdrive and LED

  8. Stabilisation, contd. • Work programme (LAPP, PSI, CERN, Oxford) • Main linac quadrupole stabilisation (LAPP, CERN) • Support design and construction • Magnet design and construction • Design of feedback software • Test in CTF3 • Final doublet stabilisation (LAPP, CERN) • Understanding the limitations of previous tests • Development of improved equipment • Feedback tests • Alignment monitoring system for ATF2 (Oxford) • Development • Construction • Use at ATF2 • Use at CTF3 for comparison with inertial sensors • Development of luminosity tuning techniques based on alignment sensors • Passive stabilisation and movers (PSI) • Achieve 1nm above 1 Hz with passive system Daniel Schulte: EUROdrive and LED

  9. Alignment • Concern: • Active alignment is needed to achieve initial survey precision and stability for CLIC • Also beneficial for ILC BDS • Alignment and stabilisation strongly interact • Objective: • Explore the survey precision that can be reached • Explore cost effective technologies that can be used • Use of alignment system to stabilise the beam lines • Work programme: (CERN) • Test of alignment over long distances (existing tunnels) • Development and test of wire less sensors (CTF3) • Note: mechanical alignment of accelerating structures and wakefield monitors are presented by Walter Wuensch • Alignment will be integrated with stabilisation or mechanical alignment Daniel Schulte: EUROdrive and LED

  10. Crab Cavity • Concern • The crab cavity is vital for luminosity performance • Damping and detuning of transverse modes is tough since transverse mode is used to kick the beam in horizontal plane • Objective • Design and test a crab cavity • Work description (Cockroft, Lancaster, Manchester, CERN) • Design and build a prototype to be tested at CTF3 Daniel Schulte: EUROdrive and LED

  11. Simulation Studies • Concern: • Beam performance of ATF2 and BDS of ILC or CLIC • Instrumentation performance in BDS • Correctness of BDSIM • Collimator wakefields • Objective: • CLIC and ILC beam delivery system optimisation • ATF2 operation improvement • Instrumentation background studies • BDSIM benchmarking • Wakefield database/program modules Daniel Schulte: EUROdrive and LED

  12. Simulation Studies, contd. • Work programme (Daresbury, Manchester, LAL, LLR, RHUL) • RHUL • Benchmarking of BDSIM at CTF3, ATF2, PETRA • Application to determine diagnostics performance • Daresbury/Manchester • BDS optimisation using experience from ATF2 • Use of high performance computing infrastructure at Manchester • LAL/LLR • Contribution to BDSIM benchmarking • Simulation of impact of background on polarimeter and luminometer • Comparison of different IR designs • Manchester (No infrastructure identified) • Compilation of wakefield models • Simulation of impact of wakefields in BDS Daniel Schulte: EUROdrive and LED

  13. Laser Wire • Concern • Laser wires are crucial diagnostics in linear colliders • Objective • Further develop laser wire technology • Work programme (RHUL, Oxford) • Demonstration of fast 2D scans at PETRA (RHUL) • Micron scale laser wire at ATF2 (RHUL) • Demonstration of beam tuning at ATF2 (RHUL) • Laser development (Oxford) Daniel Schulte: EUROdrive and LED

  14. High Precision BPMs • Concern • BPM performance is critical for BDS, in particular spectrometer • Objective • Develop reliable and simple cavity BPM system • Aim for 10nm resolution • Workprogramme (RHUL) • Deliver S-band and C-band BPM system for ATF2 • Advance BPM system design Daniel Schulte: EUROdrive and LED

  15. Other Topics • Originally planned but removed to reduce cost • Full fast phase feedback (EUROdrive) • Reduced machine protection to loss monitors (EUROdrive) • Fast IP feedback (LED) • Luminosity instrumentation development and tests (LED) • Had also removed corresponding simulations, some might come back • Proposed but not included • Instrumentation for laser plasma acceleration (to be discussed where this goes) • Beam dump (is this beam transport?) • Positron target (is this beam transport?) Daniel Schulte: EUROdrive and LED

  16. Resources Drive Beam Almost matches Erk’s target – had been downsized for this purpose Daniel Schulte: EUROdrive and LED

  17. Resources Stabilisation/Alignment Somewhat above original proposal but way too large for Erk Daniel Schulte: EUROdrive and LED

  18. Resources Other Topics Completely over budget - only crab cavity is stability issue Daniel Schulte: EUROdrive and LED

  19. To Do • Total request is about 7 M€ with about 16 M€ provided by labs • The scope of the JRA and each task will be reviewed and adjusted • The orignal proposal contained the highest priority CLIC issues • Drive beam stability and losses • Main beam line element alignment and stability • The new requests reflect ILC priorities • Often also interesting for CLIC, but not highest priority • But need to agree on common priorities • Input from ESGARD? • Will try to find solution in JRA, if possible • The corresponding resources will be reviewed • Some of the new topics were entered last Friday for the first time • Critical review of resources needs to be done in parallel with scope review • Phone meeting this week • Face to face meeting next week Daniel Schulte: EUROdrive and LED

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