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ILC ML Lattice Design Status

ILC ML Lattice Design Status. Nikolay Solyak, Alex Valishev, F.Ostiguy, P.LeBrune, L.Michelotti FNAL LET RDR meeting June 8, 2006. “Realistic” Lattice Design. Defined by cryo segmentation (T.Peterson) Few versions of segmentation March 25; April 6; May 2; May 16; May 25; May31;

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ILC ML Lattice Design Status

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  1. ILC ML Lattice Design Status Nikolay Solyak, Alex Valishev, F.Ostiguy, P.LeBrune, L.Michelotti FNAL LET RDR meeting June 8, 2006

  2. “Realistic” Lattice Design • Defined by cryo segmentation (T.Peterson) • Few versions of segmentation • March 25; April 6; May 2; May 16; May 25; May31; • Basic segmentations: - Segmentation Box replaces Endbox - Sevice Box replaces SegBox at the end of Cryo unit Main Linac

  3. ML Lattice _ v.1 CM CM/Q CM Rev. April 6_06 (simplified) 11.271 11.271 12.543 • 1 Quadrupole per 3 Cryo Modules = RF Unit (35 m) • Cold drift of 2 m at the end of a String (142 m) • Warm diagnostics section of 9 m at the end of a Segment (578 m) RF Unit = 3 CM RFU RFU RFU RFU EndBox Drift:2m String = 4 RF Units String String String String Drift: 9m Segment = 4 Strings LINAC = 20 Segments

  4. ML Lattice_v.1 (2) 160 OPTIM simulation : Optics of a Segment by bx (in m) MatLIAR Simulations Nominal misalignments Mean of 100 seeds Dispersion Matched Steering hy 0 Optics of the entire LINAC

  5. ML Lattice v.2 Rev. May 2 (but SegBox=2m) CM/Q CM CM 11.271m 11.271m • 1 Quadrupole per 3 Cryo Modules = RFU (35 m) • Cold drift of 2 m at the end of a String (142 m) • No extra space in segment (578m) • Two Service Boxes 11.271m on both sides • Warm section (11.271m) between CryoUnits (2.3 km) • Addition CMQ’s for matching 12.543m RF Unit = 3 CM RFU RFU RFU RFU EndBox Drift:2m String = 4 RF Units String String String String Segment = 4 Strings Seg4 Seg1 Seg2 Seg3 ServBox ServBox Cryogenic Unit = 4 Segments LINAC = 5*(CU + warm section) Matching between CU’s RFU RFU

  6. ML Lattice_ v.2 Beta x/y OPTIM: Optics between CU OPTIM: Optics between CU MatLiar: DFS, nominal Dispersion Corrected emittance 50 seeds

  7. May 31 revision (v.3)

  8. XFEL Bunch-Compressor-Transferlines This slide from XFEL_Cryoplant_120506.ppt by Bernd Petersen The cryogenic unit service boxes may be offset from the beamline as shown, but they would be larger. Drift space is reduced to about 2 meters on each end plus warm drift space.

  9. ML Lattice v.3(Rev. May 31) MatLiar: Curved Linac DFS, nominal misalignment Corrected emittance average of 50 seeds

  10. Sensitivity of DFS to BPM/Q/Corrector position

  11. Example (bad seed): TESLA Lattice for straight Linac2 disp. bumps @ 5GeV and + 2 wake bumps @50 GeVFor Curved ILC lattice effects of bumps is smaller (? Need more studies) Static alignment with bumps (in progress)

  12. Benchmarking activity and CHEF Brief summary: 1. Leo and Paul still focused on Benchmark (CHEF vs. Merlin), and developing local expertise.  They still maintaining that improving the tracking accuracy (higher order term in CHEF propagators) will change the emittance growth figures. 2. Implementation Steering algorithms in CHEF.  Once done in that package, moving it to Merlin will be relatively straightforward, if need be (Paul)3. Once that is done, our plans include running the realistic curved Linac and possibly the RTML in CHEF, and start on the dynamical simulation.  4. Valentin Ivanov has started on characterizing simple quasi-one-to-one re-steering due to vibration or ground motion, assuming the system can remain linear.

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