The Nacelle tube is a space inside a warp nacelle, it includes the control room, which is usually found sandwiched between the bussard ramscoop (where present) and the plasma injectors. Drive plasma is released in the main body of the nacelle tube by the plasma injectors, once there its energy is absorbed into the warp coils to create a carefully modulated spacial distortion known as a warp field. (TNG: "Eye of the Beholder")
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