PHOTON SCIENCE

I. General specifications

Beamline calculations can be viewed here (PDF file)

Full beamline layout incl. P61B (click for larger view)

The OH houses a continuous variable thickness absorber (choice between Cu or C) and beam defining power slits.

The EH houses a long radius detector goniometer where different detectors can be mounted, an HPGe detector portal, a high-speed scintillator camera and a heavy load diffractometer. A heavy load Eulerian cradle can be mounted on top of the heavy load diffractometer. In most experiments, sample or sample environments are mounted on the heavy load diffractometer or Eulerian cradle. A 3 m long space is available behind the diffractometer for roll-in, roll-off setups, or for sample environments which cannot be mounted on the diffractometer. The detector portal and camera can be moved around the hutch to address each experiment’s needs.

 

Table 1. Beamline characteristics

Techniques available	Energy dispersive X-ray diffraction in Transmission and reflection High speed radiography
Photon source	10 wigglers
Max. source flux	1012 ph/s/0.1% b.w. (at 50 keV, 100mA, aperture 1 x 1 mm2 at 133 m from source)
Energy range	20 - 200 keV
Filters	Minimum: 300 micron CVD-diamond + 50 micron Cu Maximum: 900 micron CVD-diamond + 150 micron Cu Variable Cu or C attenuator 0-100mm
Spot size ON SAMPLE	min. 0.05 x 0.05* mm2 max. 2.0 x 1.5 mm2 *smaller beam size is possible in special conditions
Sample type	polycrystalline materials

 

II. Positioning Instruments

Heavy Load Diffractometer

Load capacity: 1 ton centered, 600 kg off center

Max distance from mounting platform to beam: 450 mm

Axis names:

Axis	Travel Range
hl.x	1000 mm
hl.y	1000 mm
hl.z	200 mm
hl.rx	±7o
hl.ry	±7o
hl.bet	-90 to 270o
hl.alp	±5o

 

Eulerian Cradle

Load capacity: 20 kg 

Sphere of confusion: <50 µm

Max distance from mounting platform to beam: 200 mm

Axis names:

Axis	Travel range
eu.x	150 mm
eu.y	150 mm
eu.z	50 mm
eu.phi	± 180°
eu.chi	± 90°

Examples of clamps and different samples mounted on the cradle:

 

Goniometer

The goniometer has two arms (which can be used simultaneously and moved independently) aligned with a vertical scattering plane. Routinely, one of the arms carries an HPGe detector. User supplied detectors can be mounted as well.

Load Capacity	50 kg on lower arm, 20 kg on upper arm
Sphere of confusion	< 50 µm
Max distance from mounting platform to beam	320 mm
Minimum angle between arms	20°
Lower arm movement range	0-50°
Upper arm movement range	20-70°

 

Detector Portal

The detector portal has two arms carrying an HPGe detector and associated motorized double slits. Both arms can be independently positioned in four degrees of freedom (translation on x and z, rotation around x and z). The angular movement ranges on routine operational conditions are shown below:

Vertical tilt range	3.5-10°
Horizontal tilt range	6.5-15°

Movement ranges depend on the relative position between detector portal and sample. The position of one detector arm can limit the movement range on the other arm. Larger and lesser angles are possible when non-routine detector arm and detector portal positions are used.

 

III. Detectors

HPGe Detectors

The beamline is equipped with three HPGe detectors (Mirion) with associated Xspress3 readout units (Quantum Detectors).

Sensor dimensions	12 mm diameter, 10 mm thickness
FWHM @ 122 keV	475 eV
Energy range	0-204 keV (Given incident spectrum characteristics, energies below 20 keV are typically not usable)
Acquisition # of bins	4096 (~50 eV bin size)
Optimized max count rate	100 kcts/s
Saturation count rate	~ 1000 kcts/s

 

Scintillator camera

The camera is comprised of a scintillator mount, 5 or 10 x magnifying optics, and a Phantom v2640 camera sensor. Routinely, 400 µm GaGG+ scintillators are used, although other scintillators are possible.

Sensor size	2048x1952
Bit depth	12 bits
Pixel size @ 5x	2.7 µm
Pixel size @ 10x	1.35 µm
FOV @ 5x	5.5 x 5.2 mm2
FOV @ 10x	2.7 x 2.6 mm2
Max frame rate* (full image, no binning)	6.6 kHz
Max frame rate* (full image, 2x2 binning)	25 kHz

*Higher frame rates are possible if the image size is cropped.

 

IV. Infrastructure

The experimental hutch is equipped with signal, power and media lines for supporting user experiments. A manually operated bridge crane is available for mounting/unmounting instruments inside the hutch.

Bridge Crane:

2 ton load capacity, max hook height: 3.5 m (door height: 2 m).

Signal:

Patch panel routed to control hutch containing several BNC, SHV and AB ethernet ports.

Power:

Besides standard power plugs, 5 pole CEE connectors are available for 400V and 16A, 32A and 64A.

Media:

• Compressed air, 6.5 Bar. Connector: DN 7,2 Type 26, 6 mm.*
• Cooling water (usage of cooling water requires pre-approval from Petra infrastructure groups, please contact the beamline staff in advance).
• N2, 0.5 Bar. Connector: 10 mm Swagelok quick connector. *
• Inert gas lines (routed to gas bottle cabinet outside the hutch). Connector: 6mm Swagelok fitting. *
• Gas exhaust ports. Connector: KF40

*There are adaptors on site for common hose and tube sizes. If specific communication or signal cables are needed, they can be routed outside of the hutch through the access chicanes.

Connector layout:

 

V. Control/Data analysis

Software type	Python-based, spock (Sardana)
Data output type	spectra x position, stress x position, additional parameters such as temp., incident and transmitted beam intensity, etc.
Data output	ascii, HDF 5
Software(s) for quantitative analysis	in-house