Proposed NSLS X13B Microdiffraction Instrument Source & Optics

Proposed NSLS X13B Microdiffraction Instrument Source & Optics James M. Ablett National Synchrotron Light Source NSLS 2.8 GeV X-ray Storage Ring X13 Straight-Section EPW MGU Log [ Brightness ( ph / sec / mm2 /mrad2 / 0.1% BW / 300 mA) ]

NSLS 'Hard' X-Ray Sources 1st Harmonic MGU IVUN X17 Wiggler 2nd Harmonic 3rd Harmonic X21 / X25 Wigglers X13 Wiggler

NSLS Bending Magnet Photon Energy [keV] X13 Undulator Source The Mini-Gap Undulator [MGU] the brightest source of hard x-rays (E ~ 3.7 keV 16 keV) at the NSLS. MGU parameters: 54 pole, 1.25 cm period At a gap of 3.3 mm , Magnetic field = 0.92 Tesla and Deflection Parameter, K~1.07 Fundamental @ 3.7 keV, 4x1017 ph/sec/mm2/mrad2/0.1%BW/300mA

Brightness (ph/sec/mm2/mrad2/0.1%BW/300mA) MGU Brightness Magnetic Gap=3.3 mm 8x1017 Calculated Experiment 6x1017 4x1017 2x1017

0 2 4 6 8 10 12 Photon Energy [keV]

14 16 Log[Brightness (ph/sec/mm2/mrad2/0.1%BW/300mA)] MGU Spectral Measurements (August 2002 Ablett,Berman) MGU Tuning Curves 18 17 16

15 14 2 6 10 14 Photon Energy [keV] 18

Current X13B Beamline Status monochromator hutch 27 24 20 15

12 numbers (in meters )indicate distance from center of X13 straight-section, where MGU is located. Specifications The X13B microdiffraction instrument will be modular and compact in design, which will make available a variety of x-ray optics for the experimentalist. Focused X-ray Beams on the micron-length scale and below, together with low and high x-ray divergence will be available with these optics.These will be mounted on a motorized rails and will be readily accessible. Pink Beam (Laue) and Monochromatic modes of operation will be available.- Energy tunability will be accomplished through a

4 bounce monochromator. X13B Microdiffraction Instrument Layout x-ray microfocusing optics detector circle four-bounce mono tank vibration isolation table diffractometer vibration isolation table 24

25 26 Distance from MGU source [meters] 27 Suite of Optics offered Pin Holes Capillaries KB Mirrors Zone Plates Planar Refractive Lenses (Current R&D)

Kirkpatrick-Baez Elliptical Mirrors Key Features: Achromatic - Energy independent focusingpink beam and monochromatic modes Accurate Elliptical Figures Achievable (either by bending or metal deposition ) Small Spot Sizes Heavy metal Polished spherical Silicon substrate High Reflectivity at Grazing Incidence Angles X13B Microprobe

differentially-deposited elliptical KB optics have been used at X13B during the past few years, designed primarily for high-pressure x-ray spectroscopy. Vertical blade scan current derivative Horizontal blade scan current derivative ~ 9 microns FWHM ~ 3 microns FWHM blade position [ microns ] blade position [ microns ] X13B Microprobe

Calcium K Fluorescence Mapping of Osteoarthritic Bone 1. 3.7 mm 3. 2. 3.3 mm 1 . 2.

3. Preliminary KB layout 25 m to MGU source 2cm incident x-rays focal position 3cm 10 cm Expected Parameters 1 micro-radian figure error Spot size 0.7 x 2 micron2

Divergence 1mrad (v) x 7 mrad(h) 8 keV, 6x109 ph/sec Gain 5x104 With Figure Error (1 micro-radian) X13B Microprobe R&D Efforts -Planar Refractive Lenses Intensity [arb. Unit] (K. Evans-Lutterodt, J.M. Ablett) Position [mm] Summary

A state-of-the-art hard x-ray microdiffraction instrument is proposed for NSLS mini-gap undulator beamline X13B. It will offer a variety of x-ray microfocusing optics micron scale spatial resolution and below & high and low divergence. Big-beam (unfocused ) mode. Pink Beam and Monochromatic Modes of Operation. Simultaneous fluorescence and diffraction information.

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