Source Parameters

 

  • X-ray source: APS undulator A, 72 periods, period length 33mm, provides continuous energy coverage from ~3keV to (theoretically) well above 100keV.
     
  • Electron beam size (σ values): 270μm horizontal, 8.6μm vertical.
     
  • Electron beam divergence (σ values): 11.4μr horizontal, 2.9μr vertical.
     

Note: The X-ray source dimensions are somewhat larger than the values above, due to radiative effects. The extent of the radiative "bloat" depends on x-ray energy, becoming negligible for high energies.

  • Bruker cryogenically cooled double crystal monochromator, using pairs of Si (111) or Si (311) crystals.
     
  • Energy range : 5-36keV with Si (111), 10-70keV with Si(311) 
     
  • Bandwidth: 1.3x10-4 with Si (111), 2.8x10-5 with Si (311)
     
  • Bruker mirror system, consisting of vertically focusing bimorph mirror and vertically deflecting flat silicon mirror. Coated with 3 stripes, as follows:
    • SiO2 - energies below 12 keV 
    • Rh - energies between 12-23 keV 
    • Pt - energies above 23 keV

 

Theoretical Flux T​hrough The Working Aperture:

 

Photon energy (keV)

Harmonic

Flux (phot/sec/0.1%bw)

10

1

4x1014

30

3

5x1013

50

5

7x1012

70

7

1x1012