14 ID Beamline

The 14-ID-B station is an insertion device station with two U21 in-line undulators. A series of choppers, shutters, and mirrors are used to isolate a single ~250 ps X-ray pulse or longer pulse trains and to focus the X-ray beam onto the sample. In the standard mode of operation, a polychromatic beam is used and secondary KB mirrors permit focusing down to 25 x 15 µm² (H x V). This station supports Laue and Time-Resolved Crystallography, and Time-Resolved Solution Scattering. 

Optics

• • Heat Load Chopper: Reduces heat load on downstream optics by ~99 %.
  • Si (111) double-crystal monochromator: Can be used to produce monochromatic beam but not used in standard polychromatic operation.
  • Primary KB mirror system
  • Secondary KB mirror system

Beam Characteristics

• • Energy range:
    • 9-15 keV
  • Bandpass:
    • ΔE/E: 1.4 x 10^-4(monochromatic)
    • ΔE/E: 5 x 10^-2 (polychromatic)
  • Beam size, horizontal x vertical (FWHM):
    • 25 x 15 µm² (H x V)
  • Polychromatic (pink) beam flux:
    • 5.8 x 10⁹ photons per 250ps X-ray pulse in APS 48-bunch mode

Station

• • Julich X-ray chopper: Used to isolate single X-ray bunches from the APS in 48-bunch mode.
  • Sample positioning:
    • ALIO diffractometer with a 1 um sphere of confusion
    • High resolution color sample alignment cameras
    • Automated crystal centering
  • Sample to detector distance:
    • 100 to 800 mm adjustable
  • Sample temperature control:
    • Liquid nitrogen sample cooler
  • Rayonix MX340-HS and ePix 10K detectors

Other Equipment/Facilities Available

• • Carl Zeiss microscope for sample preparation
  • Laser Lab with ps and ns pulsed lasers, as well as CW lasers
  • Chemistry Lab