HDR Electromagnet

Tragically, one thing I have found out is that if you use an HDR electromagnet the copper wire gets warm. Also, if you wait long enough it can get hot enough to burn you. Thus, we need a method to keep the HDR electromagnet cool. Well, my way is to put it in the freezer because I get much longer use. For example, normally, it gets hot after ten minutes, but if we freeze the iron core we get twenty minutes of use, that is before the iron core of the electromagnet gets too hot to handle without a glove.