The Kadomtsev model explains rapid temperature drops in these devices called sawtooth relaxations. One type of these devices are protected from kink instabilities when the safety factor is greater than one. (-5[1])Another type of these devices heats a hohlraum using laser pulses in a technique called ICF. The (10[1])first one of these devices to achieve a Q greater than one (10[2])is (10[1])the National Ignition Facility, (10[2])which uses internal confinement. Magnetic fields confine plasma in a toroid in the stellarator and tokamak types of these (10[1])machines, and these devices often use deuterium and tritium for fuel. (-5[1])For 10 points, name these devices that seek to produce power by combining atomic nuclei. ■END■ (10[3])