Let me put the whole question to the ztforum
Would it be able to cool a permanent magnet that absorbs about 200 Watt from an electron beam and has a length of 6 cm and a diameter of 2.2 cm by Peltier effect under the condition that the cooling device and the connections must not take up much volume because there is a high electron flux in the place (all in vacuum)? The heat would have to be transported over at least 20 cm where a heat exchanger could be installed. But would it be possible to transport the heat via electric current over a distance of about 10 m to the outside of the vacuum beam pipes?.
Thank you for answering,