ESGARD OMIA Sept EUROdrive and LED Motivation Work Packages Partners & resources

ESGARD OMIA Sept 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

ESGARD OMIA Sept 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

ESGARD OMIA Sept 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

ESGARD OMIA Sept 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

ESGARD OMIA Sept 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

ESGARD OMIA Sept Stabilisation Concern: –The CLIC luminosity performance critically depends on The main linac quadrupole stability 1Hz) The final doublet stability 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

ESGARD OMIA Sept 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

ESGARD OMIA Sept 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

ESGARD OMIA Sept 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

ESGARD OMIA Sept 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

ESGARD OMIA Sept 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

ESGARD OMIA Sept 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)

ESGARD OMIA Sept 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

ESGARD OMIA Sept 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?)

ESGARD OMIA Sept Resources Drive Beam Almost matches Erk’s target had been downsized for this purpose TaskInstituteContr. k€Requ. K€Sum k€ Phase monitorINFN Phase monitorCERN Phase monitorPSI Drive alignment simulation Uni Valencia Drive alignment simulation INFN SimulationCERN CSR SimulationPSI Loss monitorCERN Sum

ESGARD OMIA Sept Resources Stabilisation/Alignment Somewhat above original proposal but way too large for Erk TaskInstituteContr. k€Requ. K€Sum k€ Quad prototypeCERN StabilisationIN2P StabilisationCERN StabilisationPSI stabi quad alignCERN LET FB stabiJAI AlignmentCERN Sum

ESGARD OMIA Sept Resources Other Topics Completely over budget Only crab cavity is stability issue TaskInstituteContr. k€Requ. K€Sum k€ LaserwireJAI Laser developmentJAI BDS BPMsJAI BDS studiesCockcroft BDSIM studiesJAI IP Lumi- and polari- meter simulations IN2P Collimator wake simulations Cockcroft Crab cavityCockcroft Sum

ESGARD OMIA Sept 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