MCT Beamline

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Last updated: Apr 04, 2024 by AS Imaging Wiki
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Table 1. Basic beamline parameters.

Source

Bending magnet (1.3 T); E (critical) 7.95 keV

Hutches

Centred at ~15 m, ~24 m & ~31 m

Energy range

8 – 40 keV (+ filtered-white & pink)

Monochromator (DMM)

3 multilayer stripes: ∆E/E ~ 0.5% & 3%

Mirror (VBM)

Single-bounce vertical, bendable (concave & convex); 2 stripes

Beam size

Max. 44 mm (H) x 6.6 mm (V) at 22 m, 64 mm (H) x 9.6 mm (V) at 32 m

Detectors

CMOS- & CCD-based with scintillators & specialised magnifying optics

MCT photon-delivery modes:

  1. white beam;

  2. monochromatic beam (8 -> 40 keV with 3% band-pass or 8 → 20 keV with 0.5% band-pass) delivered by double-multilayer monochromator (DMM);

  3. monochromatic beam in conjunction with VBM to increase the beam in vertical direction;

  4. pink beam delivered by vertical-bounce mirror (VBM) to cut off high-end energy.

Imaging detectors :

  1. white-beam detector – for all delivery modes;

  2. mono-beam detector – for X-ray energies ≤ 20 keV.

 

These detectors are based on pco.edge 5.5 scientific CMOS cameras (2560 pixels (horizontal) x 2160 pixels (vertical) with a native pixel size of 6.5 μm).  A variety of scintillators & objective lenses are available depending on user requirements for collection efficiency, spatial resolution & field-of-view.  The end result will be limited by the detector FOV & the beam size.

 

Absorption-contrast & propagation-based phase-contrast imaging modalities will be available using the 3 m long first optical table in hutch B.

 

A separate, table-mounted shutter will be available if needed, as will two ionisation chambers capable of monitoring beam flux.  If dose rate is an issue, for radiation-sensitive samples, a calibrated dosimetry system is available.

 

Both “step-&-shoot” & “on-the-fly” scan modes for CT data collection are available.

 

CT data sets are able to be reconstructed at the beamline using the ASCI high-performance computing system with dedicated compute nodes & software specifically developed for this task.  More detailed data processing, analysis & visualisation will also be facilitated via remote access to ASCI following the conclusion of the experiment.

 

It is essential that those planning to submit experiment proposals for use of the MCT beamline, consult beamline staff to discuss the technical details & feasibility, prior to final submission.

Contact:

as-mct@ansto.gov.au

 

 

 Table 2. White-beam detector for energy range 8-40 keV (pco.edge 5.5)

Magnification

FOV (mm2)

(hor) x (ver)

Effective pixel size (µm)

Image shape

(hor) x (ver)

1X

16.6 x 4*

6.5

2560 x 2160

1.8X

9.216 x 4*

3.6

2560 x 2160

4.5X

3.7 x 3.1

1.434

2560 x 2160

9X

1.848 x 1.56

0.722

2560 x 2160

18X

0.92 x 0.78

0.361

2560 x 2160

*4 mm is limited by the beam size, dark region on the remaining area 

Table 3. Monochromatic-beam detector for energy ≤ 20 keV (pco.edge 5.5)

Magnification

FOV (mm2)

(hor) x (ver)

Effective pixel size (µm)

Image shape

(hor) x (ver)

1.25X

13.3 x 4*

5.2

2560 x 2160

2X

8.3 x 4*

3.25

2560 x 2160

4X

4.16 x 3.5

1.625

2560 x 2160

10X

1.66 x 1.4

0.65

2560 x 2160

20X

0.83 x 0.70

0.325

2560 x 2160

*4 mm is limited by the beam size, dark region on the remaining area  

Table 4. High-speed detector for energy range 8-40 keV (Phantom S710) - not available yet

Magnification

FOV (mm2)

(hor) x (ver)

Effective pixel size (µm)

Image shape

(hor) x (ver)

Magnification

FOV (mm2)

(hor) x (ver)

Effective pixel size (µm)

Image shape

(hor) x (ver)

2X

12.8 x 4*

10

1280 x 800

5X

5.12 x 3.2

4

1280 x 800

7.5X

3.414 x 2.134

2.667

1280 x 800

10X

2.56 x 1.6

2

1280 x 800

*4 mm is limited by the beam size, dark region on the remaining area  

 

Several example for sample mounting: