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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. 
 
 

If you are interested to get a cloud chamber you can show me your interest here, so I will let you know informed in priority when my cloud chamber will become available for sale :

The price will be in < 4500 € range shipped to Europa. I will propose a new prototype in end of summer 2020. This new machine will have an active surface about 36 x 25 cm and will weight about 20 kg with an external size roughly equal to an A3 sheet size. My lab is located near Avignon, France.