Vibration resistant initiator assembly having exploding foil initiator

An initiator assembly comprising:

• a housing having a housing member and a cover, the housing member having a first axial end and a second axial end, the housing member defining a cavity with a first cavity portion, a second cavity portion and a third cavity portion, the first cavity portion extending through the first axial end of the housing member, the third cavity portion extending through the second axial end of the housing member, the second cavity portion being disposed between the first and third cavity portions, the first cavity being larger in diameter than the second cavity portion so as to define a first annular shoulder on the housing member where the first and second cavity portions intersect one another, the second cavity portion being larger in diameter than the third cavity portion so as to define a second annular shoulder on the housing member where the second and third cavity portions intersect one another, the cover being fixedly coupled to the second axial end of the housing member to close an end of the cavity;
• an output charge received in the third cavity portion, the output charge being at least partly formed of an explosive material;
• an input charge assembly having a holder and an input charge, the holder being fixedly coupled to the housing member and having a first holder portion and a second holder portion, the first holder portion defining a charge aperture that does not extend fully through the holder, the second holder portion being smaller in diameter than the first holder portion, wherein a third annular shoulder is formed on the holder radially outwardly of where the second holder portion intersects the first holder portion, the first holder portion being received into the second cavity portion and located such that the third annular shoulder is spaced apart from the second annular shoulder on the housing member, the second holder portion being partly received in the third cavity portion, the input charge being received into the charge aperture and being formed of an explosive material;
• a base/EFI assembly having a base, a plurality of terminals, and an exploding foil initiator, the base being fixedly coupled to the housing member, the terminals extending through the base and being electrically coupled to the exploding foil initiator, the exploding foil initiator being coupled to the base, the base/EFI assembly being slidably received into the first cavity portion and closing the cavity on a side of the housing member opposite the cover, wherein the base/EFI assembly is abutted against either an axial end of the holder or a barrier that is abutted against the axial end of the holder.