A neutron generator tube of claim 4 wherein said thermal conductor cathode is a OFHC copper rod having a film of titanium deposited on a polished end of said rod to serve as said target.Ħ. A neutron generator tube of claims 1 or 2 wherein said thermal conductor cathode has a cross-section of substantially the same size as the target and wherein the end of said cathode containing the target is within said housing and the other end extends outside said housing such as to remove thermal energy from said target.ĥ. A neutron generator tube of claim 2 wherein said removable magnet is a samarium/cobalt magnet.Ĥ. A neutron generator tube of claim 1 further comprising a removable magnet adapted to fit into said axial recess.ģ. (f) an electron shield near said cathode target and between said ion screen ensemble and cathode target wherein said electron shield contains an axially positioned aperture.Ģ. (iii) a thin metal grid sandwiched between said cover and disc such that an electrical potential may be externally superimposed on said ion screen ensemble and be varied relative to the potentials of said ring anode and cathode such as to assist in the extraction of ions from the ion source and (ii) a magnetic metal disc on the anode side, and (i) a highly polished thin-walled cover on the cathode side, (e) an ion screen ensemble near said anode ring and between said anode ring and cathode target wherein said ion screen ensemble contains an axially positioned gridded aperture wherein said aperture is substantially smaller than said anode ring and target and wherein said ion screen ensemble further comprises: (d) an axially oriented thermal conductor cathode penetrating through the other end of said housing wherein the inner surface of said cathode contains a target (c) a ring anode axially oriented within said housing adjacent to said recessed end for accepting said magnet (b) an axial recess in one end of said housing adapted to receive a magnet (a) a hermetically sealed housing containing an ionizable gas Such a system is particularly useful in oil and gas well logging procedures. Optionally, a means to control the potential on this ion screen is provided to assist in ignition of the ion source. An ion screen between the anode ring and cathode target containing an axially positioned gridded aperture provides a broad ion beam of reduced power per unit area. The cathode target is an OHFC copper rod of substantially the same cross-sectional area as the target with one polished end of the rod containing a titanium film within the housing to serve as the target and the other end of the rod extending out of the housing such as to remove thermal energy from the target during operation. The housing is provided with a recess axially oriented relative to the ring anode and target cathode and adapted to accept a removable samarium/cobalt magnet such that degassing and sealing of the housing can be performed in the absence of the permanent magnet. A neutron generating system comprising a hermetically sealed housing containing an ionizable gas and a ring anode and target cathode of a Penning ion source.
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