1. ESGARD OMIA 10.-11.Sept 2007 1 EUROdrive and LED Motivation Work Packages Partners & resources

2. ESGARD OMIA 10.-11.Sept 2007 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

3. ESGARD OMIA 10.-11.Sept 2007 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

4. ESGARD OMIA 10.-11.Sept 2007 4 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)) CTF3 Beam Studies

5. ESGARD OMIA 10.-11.Sept 2007 5 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 Phase Monitor

6. ESGARD OMIA 10.-11.Sept 2007 6 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 (Cherencov based) –Perform measurements in CTF3 –Benchmark with simulations (RHUL, listed in LED) Loss Monitor

7. ESGARD OMIA 10.-11.Sept 2007 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

8. ESGARD OMIA 10.-11.Sept 2007 8 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

9. ESGARD OMIA 10.-11.Sept 2007 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

10. ESGARD OMIA 10.-11.Sept 2007 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

11. ESGARD OMIA 10.-11.Sept 2007 11 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 Simulation Studies

12. ESGARD OMIA 10.-11.Sept 2007 12 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

13. ESGARD OMIA 10.-11.Sept 2007 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)

14. ESGARD OMIA 10.-11.Sept 2007 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

15. ESGARD OMIA 10.-11.Sept 2007 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?)

16. ESGARD OMIA 10.-11.Sept 2007 16 Resources Drive Beam Almost matches Erk’s target had been downsized for this purpose TaskInstituteContr. k€Requ. K€Sum k€ Phase monitorINFN256152408 Phase monitorCERN24880328 Phase monitorPSI433219652 Drive alignment simulation Uni Valencia 384173557 Drive alignment simulation INFN28096376 SimulationCERN7203701090 CSR SimulationPSI402060 Loss monitorCERN22196317 Sum258212063787

17. ESGARD OMIA 10.-11.Sept 2007 17 Resources Stabilisation/Alignment Somewhat above original proposal but way too large for Erk TaskInstituteContr. k€Requ. K€Sum k€ Quad prototypeCERN360200 560 StabilisationIN2P31756640 2396 StabilisationCERN1024520 1544 StabilisationPSI210105 315 stabi quad alignCERN4824 72 LET FB stabiJAI1460630 2090 AlignmentCERN960480 1440 Sum581825998417

18. ESGARD OMIA 10.-11.Sept 2007 18 Resources Other Topics Completely over budget Only crab cavity is stability issue TaskInstituteContr. k€Requ. K€Sum k€ LaserwireJAI9105931503 Laser developmentJAI20377202757 BDS BPMsJAI424244668 BDS studiesCockcroft13666442010 BDSIM studiesJAI419130549 IP Lumi- and polari- meter simulations IN2P38322601092 Collimator wake simulations Cockcroft8403221162 Crab cavityCockcroft7363681104 Sum7564328110845

19. ESGARD OMIA 10.-11.Sept 2007 19 To Do Total request is about 7MEuro with about 16Meuro 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