Test results of a demonstration HTS magnet for minesweeping

American Superconductor completed building a demonstration HTS minesweeping magnet for airborne superconducting mine countermeasure system in December 1999. The demonstration magnet consisted of a single-layer HTS coil wound on a 457-mm G-10 mandrel and housed in a 560-mm diameter by 1.5-m long stai nless steel vacuum vessel. It is conduction cooled with a two-stage cryocoo ler, It has a magnetic moment of 15 kAm(2). The magnet was successfully ram ped up to 400 A at similar to 35 K. The magnet current was kept at 100 A fo r six hours without any voltage run-away, The magnet was also successfully tested for 50 % AC modulation (200 A to 400 A) with a trapezoidal current w aveform. Experimental data from these tests are presented.