Correlated measuring method for ion average velocity of orienting plasma beam

A plasma and average velocity technology, applied in radiation measurement, measurement device, X / γ / cosmic radiation measurement, etc., can solve the problems of low precision, cumbersome measurement process, inability to obtain microsecond magnitude, etc., and achieve measurement results. The effect of small error and simple measurement process

Inactive Publication Date: 2008-07-16
HARBIN INST OF TECH
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Problems solved by technology

[0007] The present invention provides a directional plasma injection method to solve the problems of large errors, cumbersome measurement process, low precision and inability to obtain the change characteristics of the ion average velocity in the order of microseconds in the existing method for measuring the average injection velocity of ions. Correlative measurement method of the average velocity of the ion in the body beam

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  • Correlated measuring method for ion average velocity of orienting plasma beam
  • Correlated measuring method for ion average velocity of orienting plasma beam
  • Correlated measuring method for ion average velocity of orienting plasma beam

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specific Embodiment approach 1

[0017] Specific Embodiment 1: Referring to Fig. 1 and Fig. 2, the method for completing the present embodiment adopts the device with the following structure, which consists of a steady-state plasma engine 1, a positive bias power supply 2, an oscilloscope 3, and a first probe 4-1 , the second probe 4-2, the first resistance 5-1, the second resistance 5-2 and the power supply 6, the first probe 4-1 and the second probe 4-2 are respectively set in the steady state plasma In the plume area of ​​the engine 1, the left and right central points of the upper end surfaces of the first probe 4-1 and the second probe 4-2 are all located on the upper and lower central axes of the steady-state plasma engine 1, and the first probe 4- The output end of 1 and the first end of the first resistance 5-1 are connected with the first input end of the oscilloscope 3, and the output end of the second probe 4-2 and the first end of the second resistance 5-2 are connected with the first end of the se...

specific Embodiment approach 2

[0025] Specific embodiment two: referring to Fig. 3, the difference between this embodiment and specific embodiment one is that it is realized by the following steps:

[0026] Step 1. Start the steady-state plasma engine 1 and adjust it to a stable discharge working state where the discharge voltage Up is 300V and the anode gas supply flow rate is 3mg / s. From then on, a certain density of plasma fills the plume area;

[0027] Step 2. Start the positive bias power supply 2. The positive bias power supply 2 can adopt a 0-100V adjustable DC stabilized power supply. Adjust the output value of the positive bias power supply 2 to 40V. The left and right central points are set at a distance of 15 cm from the upper and lower central points of the steady-state plasma engine 1, and the left and right central points of the upper end surface of the second probe 4-2 are arranged at a distance from the upper and lower central points of the steady-state plasma engine 1. The distance is 48cm;...

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Abstract

The invention discloses a related measurement method of the ion average speed of a directional plasma beam, which relates to a method for measuring the ion average speed of a directional plasma beam with density fluctuation property and aims at solving the problems that existing measurement methods have bigger error and more complex measurement process and cannot acquire the property of ion average speed change in the microsecond magnitude. The method of the invention consists of the following steps: step one, a steady plasma engine is started and adjusted to a state of stable discharging; step two, a positive bias power source is adjusted to lead the voltage loaded on two probes to be respectively in an electronic saturation region of electric current; step three, an oscillograph is started and adjusted to display a low-frequency oscillator signal clearly; step four, the data signal of the two probes in a same time section is recorded when the steady plasma engine works in a steady state; step five, the time difference when the relativity of the two probe signals is strongest is searched; step six, the ion average speed of the directional plasma beam is computed according to the formula that Vi equals to the result of L divided by Delta Tau.

Description

technical field [0001] The invention relates to a method for measuring the average velocity of ions in a directional plasma beam with density fluctuation characteristics. Background technique [0002] Oriented plasma beams have been widely used in the fields of etching and aerospace propulsion. The average ejection velocity of ions is one of the important indicators of oriented plasma, but its measurement has always been a difficult problem, especially its dynamic characteristics. [0003] Steady-state plasma engine (SPT) is a kind of electric propulsion device, which is widely used in high-orbit satellite attitude maintenance, orbit transfer, deep space exploration and other fields. SPT heats electrons by an electric field to ionize an inert gas as a working medium, and the formed plasma is accelerated by an electric field to form a high-speed directional plasma jet, and its specific impulse (that is, the average ejection speed of ions relative to the device) can reach 2000...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01T1/29H01J37/244
Inventor 宁中喜于达仁李鸿刘辉丁永杰
Owner HARBIN INST OF TECH
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