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 primary KB mirrors focus the full beam to 20 x 80 um2 (H x V). The secondary KB mirrors reduce the X-ray spot size down even further to 15 x 15 um2 (H x V) but larger beams sizes can easily be generated. 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):
      – 0.020 x 0.015 mm2
    • 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

BioCARS Facility Contacts

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

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