ILC Beam Delivery System & MDI Critical Issues for LCC Phase
Delve into the critical aspects of the ILC Beam Delivery System & MDI for the LCC phase, addressing key topics such as tuning mechanisms, lattice design, optics, beam dynamics, and collimation systems. Explore cost drivers, luminosity delivery evaluation, tolerances assessment, and integration challenges to ensure optimal performance. Important considerations include tunnel length, infrastructure changes, dynamic tuning simulations, magnet field accuracy, muon shielding, and detector hall layouts.
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Presentation Transcript
ILC Beam Delivery System / MDI Issues for LCC-phase (~<2016) Glen White, SLAC May 14 2014 AWLC14, Fermilab
All of this has happened before, and will happen again
BDS Cost Drivers Tunnel length and major infrastructure changes likely to be small BDS tuning Value Engineering Emittance -> luminosity Understand tradeoffs between design choices and impact on time required to deliver required luminosity FFS complex, non-linear system. Mechanism of tuning system important.
Critical Issues Lattice design / optics (Thursday BDS sessions) All lattices -> complete status for TDR baseline (250, 350, 500 GeV cm) both IR s, ( no-detector IR?), EXT, tune-up/abort lines e+ source (lengths correct w.r.t. timing) : BDS responsibility? linac->BDS transition FFS optics properly matched and tuned for all configurations Optics designs for low energy running 10 Hz specific items : bypass-lines? Optimal BETA*? Balance between horizontal and vertical for given luminosity (-> beam dynamics/ tolerance studies)
Critical Issues Beam dynamics (BDS/Linac S2E session Tuesday) Update dynamic tuning simulations (in S2E context) Evaluate credible luminosity delivery: folding in all error sources and countermeasures Provide well-motivated and complete list of tolerances Magnet field accuracy, Multipoles, apertures, component alignment, mover capabilities, PS requirements Jitter tolerances Crossing angle Smaller? Larger? Try to quantify risk from beam dynamics perspective Specify incoming beam dynamics tolerances to accept from linac Review vacuum requirements Evaluate impact of having 2 different L* optics Review of diagnostics/technical systems BPM resolution requirements? Where are movers really needed?
Critical Issues Collimation systems & backgrounds : re-evaluate LW photon detection Muon shielding requirements Demonstration of SC FD prototype (vibration tests) CF / BDS tunnel layout, equipment distribution, central region integration, MDI issues load distributions service tunnel high-power dump enclosures Muon shielding Detector hall layout Crab cavity integration (cryogenics) SC Octupole cryogenetics push-pull logistics
Less Critical Issues & Beyond Baseline Lattice design / optics Traditional vs. baseline FFS Evaluate tuning efficiency tail-folding octupoles Phase-control of FFS Adequate number of matching quadrupoles? Profile measurement at FFS IP-image point Split QF7 Additional LW infrastructure / technology Beam dynamics Wakefield sources : specify complete list collimators beam pipes, transitions, ports, chambers, flanges etc BPMs Capability to correct momentum dispersion within BDS Tweaker quads/skew-quads in chicanes? Commissioning (see joint BDS/MDI/CFS commissioning session) Consider ability to diagnose fault conditions Special IR no-detector configuration Need QD0 installation infrastructure? AUX FD quad/split QF1? Additional IP-based BPMs/profile monitor(s)?
