SU453143A1 - Neutron tube - Google Patents

Description

I

The invention relates to neutron generators.

Neutron generators are known which use the deuterium-tritium reaction. They contain a source of deuterium ions and a target saturated with tritium. To carry out the deuterium-tritium reaction between the ion source and the target from an external source, a high (about 100–200kV) voltage is applied that accelerates the deuterium ions. However, in the case when a neutron tube is used in downhole geophysical instruments, it is difficult to create a source of high voltage of small dimensions. This circumstance limits the possibility of increasing the neutron yield in such devices and adversely affects their reliability.

The purpose of the invention is to reduce the applied voltage in the presence of a high accelerating potential between the target and the ion source; increase power and ensure the replacement of the spiral conductor.

The goal is achieved by the fact that the spiral conductor of the resonator is placed inside the dielectric

hermetic in relation to the volume of the cylinder tube.

Constructive scheme of the proposed neutron tube shown in drawing € € -j

In the metal case 1 of the tube, an internal spiral-wound electrode 2, a vacuum-tight cylinder 3 made from a dielectric, an ion source 4, target 5. One of the ends of the electrode 2 is connected to the case 1 by means of a conductor or through capacitance C, which is small for the resonant frequency of the tube. The other end of the electrode 2 is connected to the ion source 4. The volume of the tube between the housing 1 and the cylinder 3 is pumped out to the vacuum required for the operation of the tube. Target 5 is applied to the inside

the surface of the housing I opposite the ion source 4.

To turn on the neutron tube, high-frequency voltage is applied to the input 6 relative to the housing 1, the frequency

which is equal to the resonant frequency of the tube. Electrode 2 and housing 1 form a quarter-wave coaxial resonator. When high-frequency power is applied, a one-hundred-hour wave is excited, with an antinode of

The FIELD is in the gap between the ion source 4 and the target 5. It detects; in this case, the voltage difference between the ion source and the target can be made sufficient for intensive acceleration of the ions and the reaction of cerium-tritium.

Since the electrode 2 is made in the form of a spiral-wound conductor, the resonance tube frequency can be made sufficiently small to provide a good connection between the ion current and the voltage in the gap formed by the ion source and the target.

Electrode 2 is outside the vacuum volume, which provides cooling of the electrode by convection.

The use of the described neutron tube in geophysical instruments and other devices makes it possible to increase the anergy of ions bombarding (shshen / and reduce the amount of voltage applied to the tube. As a result,

neutron output is also improved, and tube negligence is improved. In addition, the operation of the neutron source in which the tube is used becomes more convenient.

Claims (1)

Invention Formula The neutron tube, made in the form of a quarter-wave coaxial resonator with a spiral inner conductor, includes an ion source placed at the free end of the inner spiral conductor and the target, rodemednuyu on the inner surface of the outer conductor, about t l n h a (and sch In order to increase the power supplied to the spiral conductor and facilitate its 3s1, the spiral conductor is placed inside a dielectric-enclosed cylinder inside a vacuum-tight tube.