All MetalJet sources are perfectly suited for integration with X-ray optics thanks to the small extreme brightness X-ray spot, high spot stability and short focus to window distance.
Focused and/or collimated beams of mono- or polychromatic X-rays can thereby be generated with state-of-the-art performance.
Excillum can offer both complete source + optics solutions as well as advice on integration with optics from third party suppliers.
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Montel multilayer optics

A Montel optic is two mirrors shaped in one plane each placed next to each other so that X-rays reflected from both surfaces are focused or collimated in two dimensions. Each mirror is furthermore coated with a multilayer structure enhancing the reflectivity for a specific X-ray energy.

In collaboration with our optics-supplier partners Excillum can offer Montel optics with synchrotron-quality low figure errors thereby preserving the brightness of the X-ray emission from a MetalJet source.

Below are examples of Montel optics that are readily available achieving state of the art flux densities in small spot applications.

ExMontel-G-105/395/7.5

A gallium Kα focusing optic ideally suited for, e.g., single crystal X-ray diffraction achieving state-of-the art flux density of 6e11 ph/s/mm^2

 

 

Source to mirror center 105 mm Convergence angle 7.5 mrad
Mirror center to focus 395 mm Transmitted energy 9.2 keV
Optics Length 150 mm Transmitted wavelength 1.3 Å

Typical performance data ExMontel-G-105/395/7.5

 

Source Model Jet Material

 

Power

[W]

Acceleration voltage

[kV]

Nominal Primary X-ray Spot Size

[µm]

Spot size in mirror focus

[µm]

Total flux in focus2

[ph/s]

Peak flux density2

[ph/s/mm2]

Mean flux density in 50 µm diamter2

[ph/s/mm2]

MetalJet D2+ ExAlloy-G1 250 70 20 80 5×109 6×1011 5×1011

ExMontel-I-110/390/3.15

An indium Kα focusing optic ideally suited for, e.g., single crystal X-ray diffraction achieving state-of-the art flux density of 6e9 ph/s/mm^2

 

 

Source to mirror center 110 mm Convergence angle 3.15 mrad
Mirror center to focus 390 mm Transmitted energy 24 keV
Optics Length 150 mm Transmitted wavelength 0.51 Å

Typical performance data ExMontel-I-110/390/3.15

 

Source Model Jet Material

 

Power

[W]

Acceleration voltage

[kV]

Nominal Primary X-ray Spot Size

[µm]

Spot size in mirror focus

[µm]

Total flux in focus3

[ph/s]

Peak flux density3

[ph/s/mm2]

Mean flux density in 50 µm diamter3

[ph/s/mm2]

MetalJet D2+ ExAlloy-I3 250 70 20 70 3×107 6×109 4×109

Custom Montel optics

In addition to the listed Montel optic designs mentioned above custom designed optics can be designed in collaboration with our optics supplier partners.

1) Accurately measuring photon flux, spot size etc. is challenging and values obtained can be presented in many ways given, e.g., the definition of spot size. Values can also change somewhat over the course of months as, e.g., the source cathode ages. Values presented are nominal but in many cases expected to be met for several thousand hours. We will be happy to provide more detail as for exact measurement methods and conditions as well statistics of available data on a case by case basis.
2) In-vacuum values assuming evacuated or He-purged beam path.
3) Note that some amount of broad-band lower-energy x-rays are also transmitted by the optic due to total external reflection on the mirror surfaces. Depending on application these X-rays may need to be managed by of filtering or using detector having an energy-threshold capability. 
Capillary optics

Capillary optics consist of a single capillary (monocapillary) or a bundle of capillaries (polycapillary) of glass reflecting polychromatic X-rays through total external reflection in each capillary. Capillary optics are thereby largely polychromatic.

Excillum currently don’t offer any specific capillary optic but have experience with integrating MetalJet sources with such optic and good contacts with various capillary optics suppliers. We would be happy to discuss any specific request where capillary optics could be suitable.

As an introduction to polycapillary optics we recommend the master’s thesis Polycapillary X-Ray Optics for Liquid-Metal-Jet X-Ray Tubes by Excillum’s employee Malcolm Lindqvist. In that work, flux densities of 2.4×10^13 are measured in a focus size of 12-14 µm.

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