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I don’t build thermoelectric cloud chamber anymore like you see in the video in the experiences page (I started them in 2010).  Thermoelectric technology don’t permit to have big interaction surfaces and needs periodic maintenance which is time consuming. In the long term run, I’m not convinced about their reliability because peltier cells have to be periodically replaced by new cells to keep good performance of cooling (and they are more and more costly).

Now, I build cloud chamber cooled by a compressor and gas (like a fridge). After some years of research, I finally obtained good results regarding the quality of tracks. But my last building need seriously more works to have something marketable. 

A cloud chamber is a powerful pedagogical tool but remain a scientific experiment. For my point of view, a cloud chamber should : 

  • Display particles with a very good quality. In this way single glass enclosure should be use, instead of two for a better viewing. But this need to use the cloud chamber in a room temperature > 20°C,
  • Permit the introduction of radioactive sources inside the chamber with sufficient space (minerals, gas, metals…),
  • Allow to use magnetic fields to observe the deflection of light particles (electrons, positons, slow muons),
  • Should be easily operated and easy to modify for anyone with a minimum knowledge.

 I don’t trust electronics. So to have a reliable machine, it should work only with mechanical switches. The components in the machine should also be easily replaceable at reasonable cost (reasonable mean a few dozen of euros, and easily mean that you can buy spare components from any source like ebay, amazon and not from proprietary reseller).


This video show my last building. 

Consider this as a prototype, built only to study the parameters of thermal equilibrium to obtain nice tracks despite the big volume of chamber. 


My lab is located near Avignon, France.

Update 08/03/2020 :

I finished some preliminary test. The final design is below.

The base of the machine have a surface of an A3 size sheet +5 cm. The active area have an surface about an A4 size sheet +4 cm.  The weight will be < 20 kg.

The price will be in ~ 4500 € range shipped to Europa. 


If you are interested to get a cloud chamber you can contact me below, so I will let you know informed when my cloud chamber will become available for sale :

  Please don’t ask me how to build your own cloud chamber, I don’t have time to help everyone and there is enough information on my website to make your own :/