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MetalJet D2+ 160 kV

The MetalJet D2+ is the latest version in Excillum’s line of extreme brightness X-ray sources, following the success of the earlier MetalJet D1 and D2. It is similar to a standard X-ray tube, but features Excillum’s unique metal-jet anode technology and advanced electron optics. Within the 5-30 μm spot-size range, it delivers significantly higher brightness than any other available microfocus X-ray source on the market, with an excellent spot quality. This makes it an ideal source for any microfocus application requiring shorter exposure times, higher throughput or better signal to noise. The 160 kV version of the D2+ allows for a higher acceleration voltage and thus a harder X-ray spectrum. The higher X-ray yield at higher energies will benefit anyone interested in the indium emission line at 24 keV or the bremstrahlung above 20 keV.


Features and Benefits

  • Extreme microfocus source power

  • Optional shutter

  • Superior spot quality

  • Optional dual-port mode

  • Minimal and predictable maintenance

  • User variable size and aspect ratio of spot

  • LaB6 long-life cathode

  • Very stable X-ray emission and spot position

  • User-friendly Graphical User Interface

  • Controlled through GUI or TCP/IP protocol

  • Adjustable take-off angle

  • No external cooling water requirement

  • Operated remotely from any computer


New logo mod 05 midsize


Technical Specifications


Target material1

Gallium alloy


Min. focal spot size

~ 5 μm

Target type

Liquid jet


Emission stability3

< 1%


21-160 kV


Position stability3

< 1 μm


0-250 W


Min. focus-object distance4

18 mm

Max current

4.3 mA


Beam angle


1) The room temperature liquid metal alloys supplied for the MetalJet source consist mainly of gallium, indium and tin. They have low reactivity and low toxicity but should
be handled according to their safety data sheets and local regulations. The currently available anode alloys are ExAlloy G1 with 95% gallium and ExAlloy I1 with 21% indium
(see typical emission spectra on next page).

2) The actual power used is dependent on spot-size and voltage. However, maximum output power of the 160 kV high-voltage-generators is 640 W.

3) Standard deviation

4) Without a shutter (24.8 mm with shutter).

5) Without a shutter (10.° mm with shutter).



Performance Examples (160 kV)


Jet material  

Nominal X-ray

spot size6 [µm]

E-beam power


Ga Kα (9.2 keV)  peak brightness

[photons/(s mm2 mrad2)]

Ga Kα (9.2 keV)  radiant flux  [photons/(s mrad2)]

In Kα (24 keV)  peak brightness

[photons/(s mm2 mrad2)]

In Kα (24 keV)  radiant flux  [photons/(s mrad2)]

ExAlloy G1







ExAlloy I1








6) Actual e-beam spot is 35×9 μm line focus, but the apparent X-ray spot is essentially circular.








Data Sheets

 D2 160 thumb 

Download the pdf here for more information