A Brief Comment on Property of Electron Yield (Gamma Process) in Glow Discharge Cathode Materials by Ion Bombardment2017/08/08 10:51

The secondary electron emission by ion bombardment is usually measured under the condition of the monoenergetic ion beam irradiation to the materials. Here we try to discuss the property of electron yield in the cathode materials considering the characteristics of normal glow cathode fall.

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Influence of Initial Electrons and Electron Multiplication on Formative Time Lag in Gaseous Breakdown2017/02/26 11:07

従来の線形破壊理論では、放電破壊の開始には無限の時間を必要とします.したがって放電形成時間の議論は出来ませんでした. 破壊が開始する臨界電子密度を定義できれば,初期電子が臨界電子密簡単な度まで増大する時間,すなわち放電形成時間を議論できます. 以下に報告を起きました.

The formative time lag in the gaseous breakdown strongly depends on the amount of initial electrons and the electronmultiplication in the electron avalanche. We discuss their influence on the formative time lag.

In the conventional linear breakdown theory, infinite time is required for starting breakdown. By defining the critical electron density required for starting breakdown, a finite time delay can be obtained. Therefor we can discuss the influence of the initial electrons and the electron multiplication on the time delay, that is the formative time lag.This is a summary of a part in the previous report titled "A Comment on Formative TimeLag of Gaseos Discharge”.

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Charge Transfer Process in Dielectric Barrier Discharge -Essential Difference between DBD and Glow Discharge-2016/09/04 14:09

最近の傾向として,放電形態を見かけの状態から確たる検証をしないまま,プラズマとかグロ-放電とか表現してしまうことが多いように思われる.放電形態の厳密な定義にしたがうことが大切だろう.DBD (Dielectric Barrier Discharge)においてもある混同が見られる.そこでDBDとRF放電,グロ-放電との本質的な違いについて一考してみた.

In the DBD (Dielectric Barrier Discharge), the surface of the dielectrics on the electrodes are charged up nearly applied voltage after a very short time from the beginning of the discharge and then the discharge is quenched, The electrons, which are charged up on the surface of dielectrics, play a role of the initial electrons in electron avalanche, when the gap is applied a high voltage of inverse polarity opposite to the preceding discharge, The discharge is never sustained in steady state. In order to continue the short pulse discharge, it is necessary to apply an AC voltage. While the discharge is happening, only the displacement current flows due to the charge transfer process.We discuss the charge transfer process in DBD and also clarify the essential difference between DBD and other discharges.
DBD is distinguished from the RF discharge by the operating frequency range. DBD in which the charge transfer by ion drift is to operate in much lower frequency than that of RF discharge. 
The essential difference between DBD and glow discharge is the presence or absence of the effect of electron emission by ion bombardment on the negative electrode. In DBD the electron emission from the electrode is never required. Even if the DBD might look like an apparent glow discharge, it would not be referred to as a glow discharge.

プラズマ よく間違える例  破壊前駆現象における発光気体. 代表例としてタウンゼント放電(正イオンの空間電荷層を速い電子が走っている放電形態でありプラズマ状態にはなっていない) 一般に高インピーダンス放電においてはプラスマは発生していない.

A Comment on Formative Time Lag of Gaseous Breadown2016/02/12 21:18

先に気体の絶縁破壊が開始される際の臨界電子密度について報告しました. 今回,初期電子がその臨界電子密度まで電離増殖する時間遅れ,すなわちFormative Time Lag についてのコメントを下記サイトに置きましたので,よろしかったらご覧下さい.ご批判頂けたら幸いです.

     The breakdown starts at the time when the electron density near the anode increases up to the critical density by ionization growth in the electron avalanche.
     We discuss the effect of initial electrons on the formative time lag. 

Front-Sheath of Micro-Plasma Appeared at the Time of Just Starting Breakdown in Gases2015/02/14 20:53

マイクロプラズマ前面のシース構造の新しい説明を下記サイトに置きました. ご覧下さい. コメント頂ければ幸いです.

We revised a part of the previous report entitled “An Estimation of Critical Electron Density at Just Starting Breakdown in Gases”(http://www.ne.jp/asahi/iupl/sunsan-tuee/ppt/Estimweb.pdf).  
"Front-Sheath of Micro-Plasma Appeared at the Time of Just Starting Breakdown in Gases" was put on the STPIG site.