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:
  – 7-15 keV
• 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

• Carl Zeiss microscope for sample preparation
• Station is embedded in a BSL-2 Facility
• Laser Lab with cw, ps, and ns pulsed lasers
• Chemistry Lab