Abstract:
A laminar flow electron gun for forming an electron beam including a cathode for emitting electrons, an apertured dishshaped electrode surrounding the cathode surface and an anode spaced from said cathode and electrode and cooperating therewith to provide a substantially uniform electric field at the surface of said cathode to cause electrons to emit normally from the entire surface in a beam, said anode also forming a divergent electrostatic lens along the path of the beam and accelerating and focusing means disposed further along the path of the beam to accelerate and focus the beam at a target.
Abstract:
An X-ray generating tube characterized by grid means formed with narrow annular slits which serve to isolate the cathode from being influenced by the high voltage of the anode. According to one embodiment, a target formed as a hollow conical surface of revolution closed at one end forms an X-ray window at one end of the tube. According to another embodiment, the axis of the tube remains substantially unobstructed whereby X-rays generated from a conical surface of the type noted above are emitted at the end of the tube disposed opposite the target end. Another embodiment combines the advantages of the first named and last named embodiment by utilizing concentricly oriented coaxially disposed electron beam control elements formed with a narrow annular slit for passing electrons radially into the axial region of the tube.
Abstract:
An electron bombarded semiconductor amplifier including an elongated envelope having an electron gun at one end to project an electron beam along said envelope, reverse biased semiconductor diodes forming a target at the other end of the envelope disposed to receive said beam and deflection means for deflecting the beam whereby more or less of the beam strikes the diodes forming the target.