About
Beamline Specifications
| Source | Bending Magnet |
| Energy Range | 0.070 – 0.744 eV (560 – 6000 cm-1)* |
| Wavelength | 17.8 – 1.7 μm |
| Resolution (ΔE) | 16.0 – 0.125 cm-1 |
| Flux (ν/s/0.1%BW) @100mA | 1 x 1014 @ 10 μm |
| Spot Size | Diffraction limited |
* This energy range corresponds to the typical operating range of the beamline. If your experiment requires an extended/modified range contact Ferenc Borondics to discuss available options.
Detector Information
The LN2 cooled single element MCT detectors used in the IFS 66v/s and Vertex 70v/S spectrometers and the Hyperion microscopes are from InfraRed Associates.
Currently the Hyperion 2000 microscope has one detector installed: a 250 micron size single element MCT detector on the right hand side.
The Hyperion 3000 microscope has a 100 micron size single element MCT detector on the left hand side, and a 64×64 element (pixel) Focal Plane Array detector which comes from Santa Barbara Focalplane. The model we have is the SBF161.
Active Optics
The active feedback beam stabilizer system was developed in the Advanced Light Source.
Two piezo-tilter (PZT) mirrors with dichroic beamsplitters and position detectors make up the Active Optics (AO) chicane of the beamline. The electronics controlling them are installed on the rack in a NIM crate. The system operates independently as a closed loop feedback control that maintains a position of the centroid of the light beam in vertical and horizontal directions. This occurs at the two sensor locations, via tilting of the PZT mirrors. As the beam is essentially pinned down at two locations a singular, stable axis of the IR beam is obtained which greatly reduces variations on the order of 600-800 Hz down to long term drift over hours. The system can re-center the beam after dumps and refills. It is ususally best to check the spikes and level of noise from SR at 7600 cm-1 and low end noise below the 800 cm-1 cutoff after refills and adjust as needed.
The Channels 1,2 (A,B) are AO 1 (X and Y axes) – the X is the horizontal axis of the “detector” and Y is the vertical axis of the “detector”. The 3,4 (C,D) channels are AO 2 (X and Y axes). The first tilter and sensor in the hutch are AO1.
The IR beam itself is actually roated 90° so that the HORIZONTAL beam motion is VERTICAL on the sensor, and the VERTICAL beam motion is HORIZONTAL.
The data is going to be logged to monitor long term drifts and beam quality to compare to Beam Position Monitors (BPMs) elsewhere.