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LCLS-II Beamline Optics Design Proposal

Comprehensive proposal for LCLS-II beamline optics design layout and parameters, including linac configuration, collimation systems, and extraction setups. Document includes lattice versions and specifications as of October 30, 2013. Detailed descriptions of injector, bypass lines, and extension segments are provided, outlining layout adjustments and necessary tasks for baseline release implementation. Visit the provided URLs for further information and resources.

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LCLS-II Beamline Optics Design Proposal

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  1. LCLS2sc MAD files: Injector to Bypass Line lattice version 1.2 (October 30, 2013) A-line SXU proposed FACET-II LCLS-II SC Linac LCLS-I extension line cross-over L1 L2 L3 bypass line HXU m-wall Sector-0 Sector-10 Sector-20 Sector-30 B-line s (m) M. Woodley

  2. new linac beam axis defined • X= +0.28 m , Y= -0.99 m w.r.t. original linac axis • Z= original linac Z-coordinate • Z= 0 at start of LI01 • Z= -20 m at cathode

  3. LCLS-II - Linac and Compressor Layout for 4 GeV L2 j = -21° V0=1447 MV Ipk = 50 A Lb = 0.56 mm L3 j = 0 V0=2409 MV Ipk = 1.0 kA Lb = 0.024 mm L0 j= * V0=94 MV Ipk = 12 A Lb = 2.0 mm L1 j =-21° V0=223 MV Ipk = 12 A Lb =2.0 mm HL j =-165° V0 =55 MV CM01 CM2,3 CM15 CM35 CM04 CM16 3.9GHz LTU E = 4.0 GeV R56 = 0 sd 0.016% 2-km LH E = 95 MeV R56 = -14.5 mm sd = 0.05 % BC1 E = 250 MeV R56 = -55 mm sd = 1.4 % BC2 E = 1600 MeV R56 = -60 mm sd = 0.46 % GUN 0.75 MeV 100-pC machine layout: Oct. 8, 2013; v21 ASTRA run; Bunch length Lb is FWHM Includes 2-km RW-wake * L0 cav. phases: ~(3.4, -15.2, 0, 0, 0, 15, 15), with cav-2 at 22% of other L0 cavity gradients.

  4. Gun + L0 98 MeV β = 7.5435 m α = -0.2173 750 KeV • Egun = 750 KeV • Einj = 98 MeV • L0 : • 8 cavity cryomodule (layout courtesy XFEL Mad deck) • gradients and phases per P. Emma layout (version of October 8, 2013) • initial Twiss are “artificial” • final Twiss from C. Papadopoulos ("GUN2013_10_08v3“)

  5. Matching + Laser Heater + L1 250 MeV 98 MeV • Einj = 98 MeV • EBC1 = 250 MeV • 6 quadrupole matching section between L0 and Laser Heater • Laser Heater chicane: • lengthened version of LCLS system (L= 3.529 m) • ηmax= 7.5 cm, R56= 14.5 mm • βX = βY = 10 m (α = 0) at center of chicane • includes momentum collimator • space for kicker (L= 2 m) and long drift (L= 8 m) provided for extraction to diagnostic line • L1 : • 2 x 8 cavity cryomodules(layout courtesy XFEL Mad deck) … φ= -22° • 3 x 4 cavity harmonic linearizer cryomodules (3.9 GHz) … φ= -165° • 90° FODO lattice

  6. BC1 + Betatron Collimation • EBC1 = 250 MeV • BC1 chicane : • copy of LCLS system • R56= 55 mm • small βX at fourth bend (CSR) • space for kicker (L= 2 m) and long drift (≈ 15 m total) provided for extraction to diagnostic line • betatron collimation system : • 2 x 90 ° FODO cells (Lcell ≈ 16 m) • β = 25 m at collimators (2 x horizontal collimation + 2 x vertical collimation)

  7. L2 1.6 GeV 250 MeV • EBC1 = 250 MeV • EBC2 = 1.6 GeV • L2 : • 12 x 8 cavity cryomodules(layout courtesy XFEL Mad deck) … φ= -21° • 30° FODO lattice

  8. BC2 + Betatron Collimation • EBC2 = 1.6 GeV • BC2 chicane : • copy of LCLS system • R56= 60 mm • small βX at fourth bend (CSR) • space for kicker (L= 2.5 m) and long drift (≈ 30 m total) provided for extraction to diagnostic line • betatron collimation system : • 2 x 90 ° FODO cells (Lcell ≈ 24 m) • β = 38.4 m at collimators (2 x horizontal collimation + 2 x vertical collimation)

  9. L3 + Extension to LI10 4.0 GeV 1.6 GeV • EBC2 = 1.6 GeV • Efinal = 4.0 GeV • L3 : • 20 x 8 cavity cryomodules(layout courtesy XFEL Mad deck) … φ= 0 • 15° FODO lattice • L3 extension : • 4 x 90° FODO cells (Lcell= 45 m) • at start of Bypass Dogleg, Z= 936.872 m (≈ 22.5 m into LI10)

  10. Bypass Dogleg + Match to Bypass Line FODO • Efinal = 4.0 GeV • dogleg bending system : • from X/Y = +0.28/-0.99 m to X/Y = -0.650494/+0.649478 m (ΔX/ΔY = -0.37/+1.64 m) • two 1.06° bends, rolled to 60.4° • 4 x 90° FODO cells (Lcell= 25.4) cancel dispersion in both planes • momentum collimator and wire scanner included • total Z-length = 102.5 m

  11. To Do for “Baseline” release • update compression parameters to latest version of P. Emma layout • use M. Venturini’s laser heater undulator parameters • exchange X and Y collimators in HXR diagnostics section • upload files to SharePoint site • MAD8 input files • MAD8 output files • ELEGANT input files • generate upload files for Oracle Database To Do after“Baseline” release • reduce chromaticity of initial matching section (L0 to LH) and other sections identified by Paul • design extraction systems and diagnostic lines (LH, BC1, BC2) • more relaxed β-functions in L2 and L3 (FFODDO rather than FODO?) • add correctors, BPMs, and other diagnostics • more …

  12. https://portal.slac.stanford.edu/sites/lcls_public/lcls_ii/beamline_optics/wiki_lib/Home.aspxhttps://portal.slac.stanford.edu/sites/lcls_public/lcls_ii/beamline_optics/wiki_lib/Home.aspx

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