| As society progresses, people's living standard rising, The demand for energy increased sharply,Comprehensive view of all the existing energy. as the reserves are limited and the shortcomings of others can not meet the long-term energy needs of mankind.Now, the development and use of new energy has the immediate pursuit, a new energy in development is called controlled thermonuclear fusion reaction energy. The so-called controlled thermonuclear fusion, is a reaction confine a mass light elements in high temperature plasma state long enough and combine it into a heavier nucleus polymer. Nuclear reactions can release large amounts of energy. To take advantage of thermonuclear fusion energy, we must study thermonuclear fusion reaction that can be controlled, it is called thermonuclear fusion reaction. Controlled thermonuclear fusion is a comprehensive research project, which contributed to the high temperature plasma physics, also promote and develop such a large volume of high vacuum and ultra-high vacuum technology, these high-tech are closely related with the national economy and national defense. The level of these technologies to some extent reflects a national industrial and technological level of development.We already know that nuclear fusion is to combine the two nucleus into a heavier nucleus. In order to make the two nucleus close together to form a new nucleus. Must overcome the Coulomb repulsion between the two nuclear, ie, nucleus must have enough kinetic energy to dash through Coulomb barrier between the two nuclear Therefore, if fusion reactions can produce, in order to made useful energy, nuclear fuel must first be heated to high temperatures, which carried out at high temperature fusion reaction, known as thermonuclear fusion, usually must be heated to hundreds of millions of nuclear degrees. We know that, with the temperature increases, the material from the solid into a liquid and gaseous, if the temperature further increases, there will be a considerable number of neutral particles produce ionization, separation into electrons and ions, such these particles that their high-temperature gaseous charge approximately the same material, known as plasma. How to live in such a high temperature plasma binding, we used the Tokamak magnetic confinement device, the former Soviet Union, Tamm and Andrei Sakharov, the United States, Spitzer were independently put forward the following ideas:apply a magnetic field (hereinafter referred to as PF) along the direction of ring cross section on top of the circular magnetic field (hereinafter referred to the longitudinal field), spiral magnetic field direction along the large ring and with large pitch is synthesized by the two magnetic field using the rotation transformation of spiral magnetic field of to confine plasma.In order to obtain the optimization of tokamak plasma performance, such as high density and temperature of the center, such as a good constraints of core department, control edging plasma and central plasma simultaneously is very important. Therefore, measure and control the edging plasma is important for studying central plasma. So we can use Langmuir electrostatic probe to measure edging plasma. Electrostatic probe (also known as the Langmuir probe) is the original tool to be used to determine the plasma characteristics as a diagnostic tool. Electrostatic probe theory is very complicated, but in simple terms we can acquire a concise explanation base on its voltage-ampere characteristics, and can figure out its plasma electron temperature, density and space potential through the voltage-ampere characteristics, the structure of probe is very simple and it has a certain spatial resolution.To achieve the desired results and to save the experimental test resources, taking into account the existing mature simulation software ANSYS and its high reliability in thermodynamic analysis, you can try to build model under various conditions, including material selection and structural design, figure out the results, then analyze the results, summarize the general rules, and sum up a set of optimal design. Also optimize the appropriate boundary conditions that can make it possible approximate reality, achieve a more realistic simulation results. The simulation can accurately guide how to design the probe in all aspects include the material, parameters, and structure, and optimize the measurement of probe in the experiments.This paper mainly covers that use ANSYS software simulate numerically the thermodynamic state of electrostatic probe after it was insert into plasma. Analyze the thermodynamic state when probe experienced hot plasma and radiation bombardment under different conditions.This paper systematically analyze the thermal state that the complex boundary conditions load on the electrostatic probe, set the appropriate load step to calculate thermodynamic state when probe radiated by the pulse of plasma, in particular, detailed analysis and summary of the the transient thermal state that electrostatic probe pulse radiated by the time-varying load.This paper focuses on the thermal contact between two kinds of materials that have quite different thermal properties, analyse the effect thermal contact resistance to the thermal state and the contact interaction to the thermodynamic coupling state in the whole pulse, thus setting reliable thermal contact resistance, simulate the actual situation in order to achieve matching.This paper not only study the thermal state when electrostatic probe bombarded by plasma pulse in the entire time course, but also study the thermodynamic coupling state when mechanical and thermal loads applied probe at the same time. comparative analysis of the simulation results with different materials and structural state, while analyzing and summarizing thermodynamic state with boundary conditions and parameters changing, select reliable material composition and structural design, optimize boundary conditions, to guide and optimize probe design systematically, to extend its service life, maintain its normal work. |
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