2.3.6 Gas Particle Excitation Transferring

    Gas particles going from the excited state back to a lower state or further excited toa higher state is the probable approach of the particle disappearing from the excitedstate. This process is called excitation transferring of gas particles. Stimulating ......查看详细>>

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2.3.7 Disappearance of Charged Particles

    The disappearance of charged particles is related to the condition of sustainingdischarge,and the disappearance of the charged particles in the gas mainly includesthe compound of charged particles,the diffusion of charged particles,the chargetransferring ......查看详细>>

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References

    [1] Xueji Xu,Dingchang Zhu (1996) Gas discharge physics. Fudan University Press,Shanghai[2] Zhancheng Wu,Xijun Zhang,Youzhi Hu (2012) Gas discharge. National Defence IndustryPress,Beijing[3] Qing Zhao,Shuzhang Liu,Honghui Tong (2009) Plasma technology and......查看详细>>

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3.1.1 Formation of Electronic Avalanche

    Townsend was the first to conduct gas discharge experiments. In a very thickdischarge tube,the gas pressure was fixed at 0.101 MPa and the electric fieldstrength was E=25 kV/cm unchanged. It was found that if there was no ultravioletradiation or electron ......查看详细>>

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3.1.2 α Process

    The α process where electrons collide and ionize with neutral particles has playedan important role in discharge development. Assuming that there is a gas spacebetween parallel-plate electrodes,when a certain voltage is exerted to the electrodes,the prima......查看详细>>

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3.1.3 γ Process

    When no (ead- 1)positive ions bombard a cathode,because of γ process,duringa unit time,there will be other γn0 (ead-1) new electrons (secondary electrons)to escape from the cathode surface. These secondary electrons become the secondgeneration seeds of io......查看详细>>

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3.2.1 Gas Discharge Volt-Ampere Characteristics

    All phenomena of current going through gas are known as gas conduction or a gasdischarge. Different operating conditions will produce different gas dischargephenomena with different discharge properties. In the study of the gas dischargephenomenon,usually......查看详细>>

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3.2.2 From Non-Self-Sustaining to Self-Sustaining Discharge

    A Townsend discharge area volt-ampere curve is shown in Fig.3.5 [2],which canbe divided into three parts: T0,T1 and T2. In the T0region,the applied voltagebetween the electrodes is low and the current flowing through the gas is small,asshown in the figure......查看详细>>

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3.2.3 The Condition of Self-Sustained Discharge

    Formula (3.15) gives the total electron current reaching the anode:The expression above shows current growth patterns of non-self-sustainingdischarge and the conditions of the transition to self-sustaining discharge. It isassumed that δ=γ(eαd-1) < 1.If......查看详细>>

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3.3.1 Paschen’s Law

    As described above,when the voltage between two discharge electrodes increases,the discharge current increases; when the applied voltage increases to a certainvalue,the discharge current will suddenly increase,thus discharge transits fromTownsend discharg......查看详细>>

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