The Advanced Photon Source
a U.S. Department of Energy Office of Science User Facility



On 12BM-B we use many different detectors to support our multitude of techniques. These detectors include:

Ionization Chambers

There are 3 Ion Chambers in use at 12BM (filled with N2, Ar, or Kr) each being used to monitor the beam at different positions during experiments. The first three chambers are used during XAS experiments to monitor the beam - 1 before the sample area (Incoming Beam Flux) and 2 after the sample area for transmission and reference foil. Sometimes experiments call for special setups in this case we use the ion chambers as needed around the experiment.

  • 200mm length Electrodes
  • Normally filled with 100% N2 (Can have other gas mixtures - Ag, He, etc).
Single Element Si - Diodes
  • Monitoring the beam in small areas around the experiment.
  • Attached to SAXS beamstop to monitor the beam and align the beamstop.
Solid State Detector
  • Canberra 13-element GeCanberra 13 Element Ge detector

The Canberra 13-Element Germanium Detector is a liquid-nitrogen cooled detector.

  • Electronics Upgrade 2017 with Quantum Detectors Xpress3
  • FWHM energy resolution approx. 127eV at 6.539 keV (Mn k-alpha)
  • Upgraded electronics remove the bottleneck at the readout stage
  • Greater than 3.5Mcps output rate
  • >80ns deadtime per event
  • 13 Channels supported
  • Filters available
CCD Detector

The MerlinX detector very high dynamic range imaging.Quantum Merlin Detector

  • 55um Pixel Size for WAXS.
  • Up to 1200 Hz Frame Rate in 1sec Bursts
  • Continuous Acquisition up to 100Hz
  • 24bit Dynamic Range with Single Threshold
  • Active Area - 28mm²
  • Photon Counting Eliminating Dark Noise
  • Compact Size
Technical Data
Resolution 512 × 512
Pixel Size 55µm2
Source to Detector approx. 1165mm

The Marccd CCD detector is the reliable standard for x-ray imaging.

  • 9 CCDs bonded to fiber-optic tapers
  • Higher resolution with no gaps
  • Excellent Linearity
  • Low Noise
  • Active Area - Square 225mm x 225mm
Technical Data
Resolution(s) 1536 × 1536, 2046 × 2046, 3072 × 3072, 6144 x 6144
Pixel Size (1536, 2046, 3072, 6144) 146µm2, 110µm2, 73µm2, 37µm2
Source to Detector approx. 1165mm

The PILATUS 100k developed by the Paul Scherrer Institute (PSI) is a two-dimensional hybrid pixel array detector. Using single photon counting mode, with very wide dynamic range, and very short readout times. Some parameters are shown below.

  • Dynamic Range of 1:1x106
  • Read Out Time < 3.0msec
  • Pixel size of 172µm2
  • Energy Range of 3keV to 30keV
  • Counting Rate > 2x106
  • Active Area of 83.8mm2 x 33.5mm2
  • No Readout Noise
Vortex 4-Element

The Vortex ME4 is a four-element silicon drift detector (SDD) with an active area of 170mm - 200mm2. It offers superior energy resolution and high throughput performance for Fluorescence experiments. Some parameters are shown below.

  • Extended probe of 300mm to 600mm
  • Large Area, Four Element SSD
  • Superb Energy Resolution
  • Temperature Stabilization of Detector
  • Cooldown time of 3 minutes