1. DELTA Project Overview Heinz-Dieter Nuhn – LCLS Undulator Group Leader Presented at LCLS-II Physics Meeting Tuesday, October 11, 2011

2. Helical Undulator R&D (DELTA) Existing Girder (U33) Support Driver Controls & Software Vacuum chamber Helical undulator to enhance taper and to provide circularly polarized (soft) x-rays Cornell’s Delta undulator is a novel, compact design that fits straightforwardly onto existing LCLS girder Plan to build and test a 3.2-m Delta @ U33 Cornel Delta undulator (A. Temnykh)

3. Variable Phase Undulators Four independent quadrants of permanent magnets move longitudinally at fixed gap. By sliding the arrays it is possible to control the K value over full range and to control the polarization of the radiation emitted Soft X-Ray Polarization Control Page 3 4 Movable PM Quadrants

4. DELTA Project Synopsis Conceptual Design is in preparation Gene Kraft the Project Engineer Sasha Temnykh will provide technical support Rough cost estimate: $1.5M Rough schedule estimate: 2 years

5. DELTA is Part of LCLS Short to Mid Term Expansions 25 Regular LCLS Und. 8 SHABs A: Present 4 SHABs 15 Regular LCLS Und. 13 Regular LCLS Und HXRSS B: Scheduled for Jan 2012 DELTA 7 Reg Und HXRSS E: Add SXR Self Seeding HXRSS F: Expand (after 2015) DELTA 15 Regular LCLS Und. HXRSS C: Option after Jan 2013 to support stronger tapering 4 Regular + 13 Weaker Und 4 Regular + 12 Weaker Und 4 Regular + 17 Weaker Und 15 Regular LCLS Und. HXRSS D: Proposed R&D (after 2013) DELTA 4 Regular + 12 Weaker Und 7 Reg Und SXRSS 7 Reg Und SXRSS Higher Brightness at 8 keV Increased Intensity Polarization Control Higher SXR Brightness 120 GW FEL Sash Temnikh will now talk about the DELTA undulator =>

6. End of Presentation