Highs and lows in superconductivity

The other day I was discussing magnetic fields in superconductors with a friend of mine, a fellow Scot as it happens. He knows a thing or two about critical currents and magnetic fields in these materials and was pointing out the huge differences in what is perceived to be a high magnetic field. To people working on superconducting quantum interference devices (SQUIDs), a few millitesla is a high field. However, those working on magnets consider 20–30 T to be high. It is therefore important for all of us working in superconductivity to understand exactly what each section of the community means when talking about high or low currents or fields. This book attempts to explain the issues in straightforward terms.