MEDIUM-BOREHELICAL-COILELECTROMAGNETIC LAUNCHER WITH A LIQUIDNITROGENCOOLED ARMATURE*

nitrogen cooling produces a factor of8 decrease in armature resistive losses. Theoretical predictions show Continued investigations ofmedium-bore helical coilthat withafactor of2decrease intotal resistive loss (i.e., electric launchers (HCEL)attheUniversity ofMissouri- armature plusstator resistance), anLNCA operating ata Columbia arepresented anddiscussed. TheHCELundervelocity of150m/sshould produce anoverall electrical to investigation hasanarmature diameter of40mm anda kinetic energyconversion efficiency of3000.The stator length of750mm. TheHCELinductance gradient experimental results confirm these theoretical predictions. is150[tH permeterandisafactor of300times greater thantheinductance gradient ofaconventional railgun. TheHCELarmature forms theprojectile andistypically