Quenching, Current Leads and a Look at Some Superconducting Accelerators

In this third and final lecture, we discuss the problem of quenching, where a part of the magnet suddenly reverts to the resistive state and can get very hot, unless suitable steps are taken to protect it. Current leads, supplying the magnet at low temperature from a power supply at room temperature, must be carefully designed if they are not to introduce too much heat leak. Finally we look at some of the large superconducting accelerators which have been built using the technology described in these lectures.