THE WORLDS FIRST 27-T AND 30-T RESISTIVE MAGNETS

We describe in detail a 30 Tesla, 32mm warm bore, 15 MW resistive magn et which was put into operation at the National High Magnetic Field La boratory in Tallahassee, FL in March 1995. The magnet consists of thre e concentric axially-cooled Bitter stacks connected electrically in se ries. This magnet employs a substantial new development in Bitter magn et technology which allows high current densities without the usually accompanying high stresses. Details of magnet optimization, design, co nstruction, testing and operation are presented. We also report on ope rating experience with the 27 T magnets.