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NSLS-II CDR SXR Concept

Impact of beam motion on soft x-ray beamlines Darío Arena, Steve Hulbert, Ruben R. NSLS – II Stability Workshop 19 April 2007. Experimental Station. Beam Chopper. Plane Mirror. Exit Slit. Elliptical cylinder KB refocusing mirrors. Plane Grating. Cylindrical Collimating Mirror. EPU. EPU.

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NSLS-II CDR SXR Concept

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  1. Impact of beam motion on soft x-ray beamlinesDarío Arena, Steve Hulbert, Ruben R.NSLS – II Stability Workshop19 April 2007

  2. Experimental Station Beam Chopper Plane Mirror Exit Slit Elliptical cylinder KB refocusing mirrors Plane Grating Cylindrical Collimating Mirror EPU EPU NSLS-II CDR SXR Concept Side view, single beam mode Side view, canted beam mode, fast switchable

  3. Vertical Source Motion: Effect on Resolution Ultra-High Resolution(UHR, 3600 l / mm) High Flux(HF, 400 l / mm)

  4. Horizontal Beam Motion: Large Demag Helps • NSLS-II: small divergence • (~15 mrad vert., ~20 mrad hor. @1000 eV) • CDR concept: no horizontal focusing until after exit slit (M3) • Effective horizontal demagnification: ~50:1 • Sample position: spot ~ 4mm (v) x 8 mm (h) • 0.5 mm beam motion (h)  0.01 mm beam motion on sample • Beam spot insensitive to vertical motion (imaging exit slit)

  5. Beam Divergence Motion • Beamline design: operation 100 eV up to ~2400 eV • hv = 100 eV: sV’ ~ 40 mrad, sH’ ~ 45 mrad • 10% values: ~ 4 mrad (vert.), ~ 4.5 mrad (hor.) • hv = 2000 eV: sV’ ~ 10 mrad, sH’ ~ 20 mrad • 10% values: ~ 1 mrad (vert.), ~ 2 mrad (hor.) • Dk ~ k * sin q ; Dk / k ~ sin q • Contribution to uncertainty of wavevector from beam angular motion is on order few parts in 106

  6. Conclusions • Spectroscopy and diffraction experiments in the soft x-ray range are very forgiving • 10% criterion is sufficient for spectroscopy and scattering • Imaging as another story (c.f. Chris Jacobsen’s talk)

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