A nuclear fuel assembly having a parallel array of elongated fuel elements supported between an upper and lower nozzle. In the reduction of amplitude jitter the modulated pulses must be phase coherent. In a water injecting step, water 2 is injected into each of a plurality of recesses 31 of the container 30. The second metal line is electrically connected to a second electrode of the semiconductor device and spaced apart from the first metal line. A first embodiment reduces the hard-bias material below the ABS by forming an extended lapping gap along the ABS in both the sensor and hard-bias material.