Quench of superconducting magnet induced by mechanical disturbance using impact hammer

In an epoxy-impregnated superconducting magnet, triggers of quench are considered to be conductor motion or epoxy cracking which succeed the temperature rise of the conductor induced by friction between conductor and epoxy or conductor and conductor. A more direct method which makes a quench would be hitting the magnet with mechanical hammer. To the authors' knowledge, there are very few papers which treat this type of quench. So they have carried out a quench experiment triggered by mechanical impact induced by dropping a weight. They have investigated the relation between magnitude of the mechanical disturbance and the behavior of the superconducting magnet. They have also investigated the relation between the impact energy and the structural change of superconducting magnet using an ultrasonic transfer function which they have already proposed as a quench detection method