A neutron beam controlling apparatus includes a plurality of multilayered plate members, each having on one or both of its surfaces, one or more minute protruding portions. The containers are vertically stackable one on top of the next in self-aligning fashion to form a vertical growing column supported by an elongated upright support pole driven into the ground and inserted through an aperture in the bottom wall of each container. The embodiment further comprises an actuator configured to drive the wedge with a sufficient driving force to separate the top cover from the base of the disc drive. The semiconductor device further comprises an isolation feature disposed adjacent to the fin structure.