14 ID Beamline

The 14-ID-B station is an insertion device station with two in-line undulators (U23 and U27). A series of choppers, shutters and mirrors is used to isolate a single 100 ps X-ray pulse and to focus the X-ray beam onto the sample. This produces a high peak power in a short 100 ps burst.  In the standard mode of operation, the monochromator is not used and the secondary KB mirrors permit focusing down to 20 x 20 µm2 (H x V).  If the monochromator is used, 100 ps monochromatic experiments can be performed. This station supports Laue and Time-Resolved Crystallography, and Time-Resolved Solution Scattering. It also supports all standard macromolecular crystallography techniques using the full, unpulsed monochromatic beam.

Optics

  • Heat Load Chopper: Reduces heat load on downstream optics by ~99 %.
  • Si (111) double-crystal monochromator: Can be used to produce monochromatic beam.
  • Primary KB mirror system
  • Julich chopper: Used to isolate single X-ray bunches from the APS in 24 bunch and hybrid modes.
  • Secondary KB mirror system

Beam Characteristics

  • Energy range:
    – 7-20 keV (monochromatic)
    – Polychromatic (pink and white) beam capability
  • Bandpass:
    – ΔE/E: 1.4 x 10-4(monochromatic)
    – ΔE/E: 5 x 10-2 (polychromatic)
  • Beam size, horizontal x vertical (FWHM):
    – 20 x 20 µm2
  • Pink beam flux:
    – 3 x 1010 photons/100ps X-ray pulse in APS hybrid mode

Station

  • 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

Other Equipment/Facilities Available

Facility Contacts

Robert Henning

Research Beamline Scientist
(630) 252-0446
henning@cars.uchicago.edu

Irina Kosheleva

Research Beamline Scientist
(630) 252-0467
ikoshelev@cars.uchicago.edu