[Shanghai University] Plasma Comprehensive Experimental Instrument
[Plasma Comprehensive Experimental Instrument]
Function, role introduction
Introduction
The instrument is a comprehensive measuring experimental device for combined probe plasma tube low-pressure discharge plasma characteristics, and is applied to teaching experiments in the field of plasma physics, involving physical and spatial physics, electronic information and other related majors.
Plasma is a complex state of accumulation of discharge materials, which is a common form of matter in the celestial body from the Earth to the outer space. The study of plasma characteristics and its measurement methods is the requirement for the dual development of modern science and higher education. The Department of Physics of Shanghai University is committed to opening plasma. In the tradition of physical physics experiment, in the period of 07-09, three teachers who have been engaged in experimental teaching for a long time completely designed and produced a new concept of "plasma comprehensive experimental instrument". Li Ming is mainly responsible for the development of the combined probe low pressure plasma discharge tube; Mr. Yu is mainly responsible for the electronic measurement and control system; Mr. Wang Ye is mainly responsible for the spectrum measurement system.
Instrument architecture
1. Combination probe plasma tube
Plug-in electrostatic probes (single and dual Langmuir probes), magnetic probes (Hall effect) and longitudinally movable fiber optic probes.
2. Electronic merger monitoring system
Programmable high and low voltage power supply for tube lighting and maintenance, automatic measurement and scanning display, computer data acquisition.
Instrument characteristics
1. Argon, mercury mixed low pressure discharge tube, cold cathode;
2. Sealed single plane probe process with high area accuracy;
3. Cylindrical hollow anode with low anode temperature;
4. Stable discharge, high measurement accuracy and long service life;
5. Platform design, can expand and open multiple experiments;
6. The host adopts modular structure, bus planning, easy to upgrade and maintain;
7. Full digital control and measurement, high control accuracy and measurement accuracy;
8. Large-screen color LCD display, silicone rubber touch button, beautiful and durable;
9. Computer communication interface is provided, and computer automatic measurement software is provided;
Experimental content
1.Langmuir single probe measures electron temperature and electron density
2.Langmuir double probe measures electron temperature and electron density
3. Hall effect method for measuring electron density and electron migration speed
4. Plasma emission spectroscopy
5. Optical fiber localization spectroscopy for measuring atomic excitation temperature
6. Microwave probe plasma diagnosis (with microwave component)
In plasma experiment teaching, plasma is generally designed as closed type and open type. The advantage of open type is that some physical conditions of plasma, such as air pressure, can be designed and changed, which is beneficial to the research of experiments. However, the instrument integration and comprehensive experimental performance are lacking; the closed plasma has the advantages of stable state and easy instrument integration, and it can perform stable and comprehensive quantitative measurement and reliable data analysis within a certain teaching time.
According to the tradition, experience and teaching development, our requirements for the new plasma experimental equipment and teaching reform are: adding modern sensing and instrument technology to various plasma measuring methods, developing a combined probe plasma tube, according to experimental measurements. Multi-layer data, comprehensive analysis to gain an understanding of the nature of the plasma. The closed plasma is suitable for the simultaneous use of integrated measuring means, and the designability of the plasma itself is realized by different plasma tubes to form a series.
In the process of development, testing, and pre-teaching, the instrument understands the status of domestic plasma physics experiments, accepts expert advice, continuously improves design, and makes technical upgrades (such as miniature spectrometers) by visiting domestic universities and writing papers. The instrument is constantly mature and advanced, and it will eventually become the current form.
Since 2009, this instrument has been applied to the “Modern Physics Experiment†course of the third-year undergraduate students of Electronic Information Science and Technology (Photophysics), Microelectronics and Applied Physics (Condensed Matter Physics) of Shanghai University. The experimental paper of the same name was published in 2009. In the 11th issue of Physics Experiments, in 2011, the "Low Temperature Plasma Temperature and Density Measurement" experiment based on the instrument was compiled into the "Modern Physics Experiment" (Second Edition) published by Shanghai University Press, 2012. The instrument was adopted by the “Plasma Physics†teaching experiment of the School of Space Science and Physics, Shandong University (6 sets). In July 2014, the instrument was exhibited during the 8th National Conference of Physics Experiment Teaching Seminar.
Name of the work: Plasma Comprehensive Experimental Instrument
Completed by: Shanghai University
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