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LCLS-II Timeline Compatible with Operations

The meeting goal is to discuss undulator options for LCLS-II, with adjustable gap, adjustable polarization, possibly two parallel avenues of pursuit (low & high risk?), and <5-yr lead time. We would like to build a prototype undulator and phase shifter this year. AGENDA :

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LCLS-II Timeline Compatible with Operations

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  1. The meeting goal is to discuss undulator options for LCLS-II, with adjustable gap, adjustable polarization, possibly two parallel avenues of pursuit (low & high risk?), and <5-yr lead time. • We would like to build a prototype undulator and phase shifter this year. • AGENDA: • Introduction/Meeting Agenda (P. Emma, 10 min) • LCLS-II Layout and Plans (Z. Huang, 25 min) • LCLS-II FEL and Undulator Parameter Studies (H.-D. Nuhn, 25 min) • Open Discussion & Questions (all, 30 min) • Coffee break (20 min) • Time for more discussion, if necessary (0-60 min)

  2. LCLS-II Timeline Compatible with Operations R&D Installation CDR ED&I Fabrication CD 1 CD 2, 3a CD 0 CD 3 CD 4 FY10 FY11 FY12 FY13 FY14 FY15 FY16 FY17 Facilities Installation Phase-1 Installation Phase-2 Installation Annual 3 month summer downtime

  3. LCLS-II Layout enclosure exists at sector 10 3-7 GeV undulator RF gun-2 RF gun-1 3-7 GeV bypass line L0 L0 undulator X X L1 BC1 L2 BC2 L3 L1 BC1 L2 BC2 L3 3-15 GeV FACET wall existing sector-11 sector-14 sector-21 sector-24 und-hall • Second injector/linac allows two independent FELs serving two • experiments simultaneously with flexible parameters • Combining beams allows x-ray/THz pump, x-ray probe with • decoupled wavelength, pulse width, energy and timing constraints

  4. 2-pulse 2-color 6-60 Å adjust. gap EEHG? 6-60 Å adjust. gap full polarization control full polarization control 5 m 3-7 GeV bypass self-seeding option full polarization control self-seeding HXR option (2 bunches) 0.75 Å adjustable gap 0.5-15 Å LCLS-II FEL Design 4-GeV SXR and 14-GeV HXR simultaneous op’s with bypass line SXR1 (45 m) SXR2 (45 m) 5 m FEE-2 240 nm  6 nm 4-14 GeV new adj. gap und. (0.5-15 Å) Shortened 74-m Undulator SHAB 30 m 5 m Existing 112-m Undulator (1.5-15 Å) FEE-1 Phase-2 Phase-3 Existing Phase-1

  5. A possible set of LCLS-II Parameters Soft X-ray line Hard X-ray line • Variable-gap, planar undulator assumed (>9 mm vacuum chamber) • APPLE type undulator 40% better gain in helical mode • Cross-undulator can be applied to two helical devices too • Undulator and FEL parameter studies by HD (next talk)

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