Neutron tube with drive-in target

A technology of neutron tube and ion source, which is applied in the direction of DC voltage accelerator to achieve the effect of ensuring electrical parameters, long service life and good heat dissipation effect.

Inactive Publication Date: 2013-02-13
SHAANXI ALLIANCE LOGISTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, with the deepening of oil field development, the current neutron tube technology can no longer meet the needs of the development of these logging technologies. The working temperature of the domestic controllable neutron source generally does not exceed 150 ° C, which depends to a large extent on the neutron tube working temperature

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Self-contained target neutron tube, composed of ion source, acceleration system, target and deuterium-tritium storage. The ion source is a cold cathode 2 Penning ion source, which consists of an anode 1, a cathode 2, an output cathode 3 and a samarium cobalt magnet 4. The cathode 2 is formed of a convex molybdenum material, and the distance between it and the anode 1 is 2 mm. The output cathode 3 is in the shape of a plane disc. The acceleration system is a single-gap acceleration system, which is composed of the output cathode 3 and the acceleration electrode in the ion source. Wherein the aperture of the output cathode 3 is 4-5mm. The target is a conical concave oxygen-free copper material. The getter in the deuterium-tritium storage is zirconium-graphite material.

Embodiment 2

[0022] In a room temperature environment, the neutron yield of the self-targeting neutron tube described in Example 1 was detected by a copper activation method. The results are shown in the table below.

[0023]

[0024] According to the above method and test data, the neutron yield of the neutron tube under the condition of 120 kV / 100μA is 2.9×10 8 n / s.

Embodiment 3

[0026] The self-targeting neutron tube described in Example 1 was subjected to a high temperature experiment at 175°C for 8.5 hours. During the experiment, by adjusting the voltage or current value of the deuterium-tritium storage, keeping the target pressure and target current value unchanged (that is, the target voltage is 120 kV, the target current is 100 μA), and the neutron yield and the change of the anode 1 current are observed. See the experimental curve figure 2 . Depend on figure 2 It can be seen that in the first 1 h, that is, when the temperature is below 50°C, the neutron yield changes little. When the temperature is in the range of 60~175℃, the neutron yield shows a downward trend as the temperature gradually rises. When the temperature rises to 175°C and enters the constant temperature zone, the neutron yield also tends to be stable as the temperature stabilizes. The anode 1 current has been very stable throughout the experiment, with a maximum variation o...

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Abstract

The invention relates to a neutron tube with a drive-in target, which relates to an ion beam tube. The neutron tube with a drive-in target disclosed by the invention is composed of an ion source, an accelerating system and a deuterium-tritium reservoir. The neutron tube with a drive-in target disclosed by the invention has the following advantages that (1) the service life is long. When the neutron tube is running, the consumed tritium energy in the target is timely compensated, and the target is always kept in a saturation state, once an enough deuterium-tritium gas mixture is distributed in the deuterium-tritium reservoir of the tube, enough deuterium and tritium are distributed in the target, so that continuous and stable neutrons are generated; (2) the operating temperature is high. The thorough gas removal of components in the tube is ensured, so that a situation that the target has a s good heat dissipation effect is ensured, and even if the target is running in an environment at a temperature of 175 DEG C, no mixed gas is released from the inside of the tube, and no deuterium-tritium gas is released from the inside of the target; and (3) the stability is good. In the process of running, the deuterium-tritium content in the target is automatically compensated and kept constant, thereby ensuring the stable neutron output; and because the deuterium-tritium reservoir with a large inspiratory capacity and a high inspiratory flow rate is adopted, the stability of air pressure in the tube is ensured, and the stability of electric parameters is also ensured.

Description

technical field [0001] The invention relates to an ion beam tube. Background technique [0002] As an important part of nuclear logging tools, the controllable neutron source composed of neutron tubes has been widely used in logging tools such as pulsed neutron energy spectroscopy, thermal neutron capture, neutron lifetime and oxygen-activated water flow. These tools are one of the best methods for reservoir evaluation in production logging, detection of channeling outside the pipe, and injection profile logging. However, with the deepening of oil field development, the current neutron tube technology can no longer meet the needs of the development of these logging technologies. The working temperature of the domestic controllable neutron source generally does not exceed 150 ° C, which depends to a large extent on the neutron tube working temperature. Therefore, the research and development of 175°C high-temperature neutron tubes is the first key technology to be overcome ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05H3/06
Inventor 王耀斌
Owner SHAANXI ALLIANCE LOGISTICS
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