X-ray Optics needs for 3 rd and 4 th generation Light Source. Mourad Idir BNL/NSLS II 1 BROOKHAVEN SCIENCE ASSOCIATES
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1 X-ray Optics needs for 3 rd and 4 th generation Light Source Mourad Idir midir@bnl.gov BNL/NSLS II 1 BROOKHAVEN SCIENCE ASSOCIATES
2 OUTLINE 3 rd and 4 th generation Light source Optics needs NSLS II Example Diffractive Refractive Lenses Mirrors 2 BROOKHAVEN SCIENCE ASSOCIATES
3 BEAMLINES 3 BROOKHAVEN SCIENCE ASSOCIATES
4 BEAMLINES 3 possible sources Bending Magnet Wigglers Undulators 4 BROOKHAVEN SCIENCE ASSOCIATES
5 BEAMLINES 3 possible sources for a beamline Bending Magnet Wigglers Undulators 5 BROOKHAVEN SCIENCE ASSOCIATES
6 BEAMLINES 3 possibles sources Bending Magnet Wigglers - Undulators 6 BROOKHAVEN SCIENCE ASSOCIATES
7 Figure of Merit : Brightness 7 BROOKHAVEN SCIENCE ASSOCIATES
8 4 th generation source : undulators based 8 BROOKHAVEN SCIENCE ASSOCIATES
9 9 BROOKHAVEN SCIENCE ASSOCIATES
10 Figure of Merit : Brightness or Brilliance 10 BROOKHAVEN SCIENCE ASSOCIATES
11 3 rd and 4 th generation Light Source There are over 40 synchrotrons and fourth generation light sources around the world. The major light sources are shown below. For a full list, visit lightsources.org. 11 BROOKHAVEN SCIENCE ASSOCIATES
12 3 rd and 4 th generation Light Source NSLS II 12 BROOKHAVEN SCIENCE ASSOCIATES
13 NSLS-II: Optimized 3 rd Generation SR 3 GeV, 500 ma, Circumference 791 m Low emittance: e x = 0.55, e y = nm-rad High brightness/flux from soft to hard x-rays Small beam size: s y = 2.6 mm, s x = 28 mm Pulse length (rms) ~15 psec 27 insertion device beamlines 31 BM / 3PW / IR beamlines Full built-out includes at least 58 beamlines, plus canted IDs TPC = $912M High-b Straight Section (9.3m) 3-pole Wiggler Bending Magnet Low-b Straight Section (6.6m) 13 BROOKHAVEN SCIENCE ASSOCIATES
14 Key Project Milestones Aug 2005 CD-0, Approve Mission Need (Complete) Jul 2007 CD-1, Approve Alternative Selection and Cost Range (Complete) Jan 2008 CD-2, Approve Performance Baseline (Complete) Jan 2009 CD-3, Approve Start of Construction (Complete) Feb 2009 Contract Award for Ring Building (Complete) Aug 2009 Contract Award for Storage Ring Magnets (Complete) May 2010 Contract Award for Booster System (Complete) Feb st Pentant Ring Building Beneficial Occupancy (Complete) Feb 2011 Begin Accelerator Installation (Complete) Feb 2012 Beneficial Occupancy of Experimental Floor (Complete) Mar 2012 Start LINAC Commissioning (Complete) Jan 2013 Start Booster Commissioning Jul 2013 Start Storage Ring Commissioning Apr 2014 Projected Early Completion; Ring Available to Beamlines Jun 2014 Early Project Completion; Ring Available to Beamlines Jun 2015 CD-4, Approve Start of Operations 14 BROOKHAVEN SCIENCE ASSOCIATES
15 NSLS-II Beamlines Underway 18 Beamline Construction Projects Underway 21 Simultaneous Endstations (SE) 28 Total Endstations (TE) Beamlines with design and construction underway 22 additional beamlines (25 SE) have been proposed by the user community and approved by the SAC and NSLS-II but are not yet funded 3 2 Beamline ConstructionProjects SE TE NSLS-II Project Beamlines Inelastic X-ray Scattering (IXS) 1 1 Hard X-ray Nanoprobe (HXN) 1 1 Coherent Hard X-ray Scattering (CHX) 1 1 Coherent Soft X-ray Scat & Pol (CSX) 2 2 Sub-micron Res X-ray Spec (SRX) 1 1 X-ray Powder Diffraction (XPD) 1 1 NEXT MIE Beamlines Photoemission-Microscopy Facility (ESM) 2 3 Full-field X-ray Imaging (FXI) 1 1 In-Situ & Resonant X-Ray Studies (ISR) 1 2 Inner Shell Spectroscopy (ISS) 1 1 Soft Inelastic X-ray Scattering (SIX) 1 1 Soft Matter Interfaces (SMI) 1 2 NIH Beamlines Frontier Macromolecular Cryst (FMX) 1 1 Flexible Access Macromolecular Cryst (AMX) 1 1 X-ray Scattering for Biology (LIX) 1 1 Type II Beamlines Spectroscopy Soft and Tender (NIST) 2 6 Beamline for Materials Measurements (NIST) 1 1 Microdiffraction Beamline (NYSBC) 1 1 TOTAL BROOKHAVEN SCIENCE ASSOCIATES
16 16 BROOKHAVEN SCIENCE ASSOCIATES
17 Diffractive Refractive Lenses 17 BROOKHAVEN SCIENCE ASSOCIATES
18 Diffractive Refractive Lenses Zone plates are circular diffraction gratings with radially increasing line density. 18 BROOKHAVEN SCIENCE ASSOCIATES
19 Diffractive Lenses 19 BROOKHAVEN SCIENCE ASSOCIATES
20 Diffractive Refractive Lenses 20 BROOKHAVEN SCIENCE ASSOCIATES
21 21 BROOKHAVEN SCIENCE ASSOCIATES
22 Refractive Lenses Snigirev et al. Nature 384, (07 November 1996); 22 BROOKHAVEN SCIENCE ASSOCIATES
23 23 BROOKHAVEN SCIENCE ASSOCIATES
24 Refractive Lenses 24 BROOKHAVEN SCIENCE ASSOCIATES
25 Nanofocusing Development MLL deposition laboratory established and in operations at BNL: Growth of MLLs: Mitigated interfacial stress build up using reactive gas mixture, and fabricated 68um-thick MLL thin-films (dr = 4 nm). Used RIE/FIB to section MLL optics 2D focusing using crossed MLL s achieved 25nm x 27nm (experiment conducted at APS 26-ID) SEM of 1 st MLL grown in new deposition system 25 BROOKHAVEN SCIENCE ASSOCIATES
26 Reflective Optics 26 BROOKHAVEN SCIENCE ASSOCIATES
27 Few reminders on reflective optics 27 BROOKHAVEN SCIENCE ASSOCIATES
28 Diffraction grating Blazed or lamellar Low roughness < 0.3 nm rms Low slope errors < 100 nrad rms Mostly Silicon substrate Size around 200 mm max. Need for Variable line spacing to Correct aberration Main application : monochromator - spectrometer 28 BROOKHAVEN SCIENCE ASSOCIATES
29 (<1980) NSLS 2 arc sec (10µrad) arc sec (5µrad) for 10µm spot arc sec (1 µrad) for 1µm spot NOW NSLS II X-ray Mirror : Overview Every new advance in SR source design has driven improvements in optical components to enable smaller focal spots (Nanoprobe) Chronology of SR mirror slope error specs: 0.02 arc sec (100 nrad) From Lord KELVIN The key is the METROLOGY 29 BROOKHAVEN SCIENCE ASSOCIATES
30 Metrology requirements Effect of the surface quality differs on each spatial frequency regime For x-ray optics all frequency are important 30 BROOKHAVEN SCIENCE ASSOCIATES
31 X-ray Optics New Challenge Diffraction limited Optics at 0.1 nm wavelengt What does it mean? Wavefront error <l/4 PV Wavefront error <l/14 rms Mirror Shape error <l/8q PV Mirror Shape error <l/28.q rms At l=0.1 nm (q=3 mrad) the shape errors need to be around 1 nm rms. 31 BROOKHAVEN SCIENCE ASSOCIATES
32 y (10-3 mm) y (10-3 mm) Slope errors effect : Grating example Beamline monochromator: Plane mirror, plane VLS grating Source size = 18 μm VLS 1800 l/mm From Ruben Reininger APS) ev, ev No SE ev, ev 0.2 µrad RMS x (mm) x (mm) Need better than 100 nrd rms slope errors (from 1 mm to the length of the grating) 32 BROOKHAVEN SCIENCE ASSOCIATES
33 X-ray Optics New Challenge 33 BROOKHAVEN SCIENCE ASSOCIATES
34 34 BROOKHAVEN SCIENCE ASSOCIATES
35 X-ray Active Optics : Family Piezo Bimorph system Mechanically actuated system 35 BROOKHAVEN SCIENCE ASSOCIATES
36 Moore s law adapted to x-ray optics focusing 36 BROOKHAVEN SCIENCE ASSOCIATES
37 37 BROOKHAVEN SCIENCE ASSOCIATES
38 CONCLUSION The advent of 3 rd synchrotron and 4 th generation FEL sources has encouraged the development of new x-ray Optics Drastic improvement in manufacturing and preparation techniques Low roughness. High accuracy figuring, perfect crystal (Ge, Si Diamond) Improve power management strategies Focusing optics (spot size ~ few um to 10 nm or less) Zone plate and refractive lenses, MLL, elliptically figured mirrors R&D programs continuously in progress : current hot topics Sub 10 nm focusing Preservation of mirror wavefront quality optics Mirror Polishing - Active optics Ex and In Situ Metrology Diffractive optics development : Grating Zone Plate Multilayers /Laue Lenses + Refractive lenses Simulation x-ray wavefront propagation Instrumentation : Heat load management Ablation Nanopositioning etc.. 38 BROOKHAVEN SCIENCE ASSOCIATES
39 Acknowledgments Google for all the images I found on the web Ray Barrett - Jean Susini ESRF Ruben Reininger APS CXRO - NSLS II etc 39 BROOKHAVEN SCIENCE ASSOCIATES
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