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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Ball-pen probe ： ウィキペディア英語版 Ball-pen probe A ball-pen probe is novel technique used to measure directly the plasma potential〔〔 in strongly as well as weakly magnetized plasmas. The probe was invented by Jiří Adámek() in the Institute of Plasma Physics () AS CR in 2004. The ball-pen probe balances the electron saturation current to the same magnitude as that of the ion saturation current. In this case, its floating potential becomes identical to the plasma potential. This goal is attained by a ceramic shield, which screens off an adjustable part of the electron current from the probe collector due to the much smaller gyro–radius of the electrons. First systematic measurements have been performed on the CASTOR tokamak.〔〔〔 The probe has been already used at different fusion devices as ASDEX Upgrade,〔〔〔〔〔 COMPASS〔〔〔〔〔〔(), ISTTOK,〔 TJ-K〔(), RFX (), MAST,〔〔 H-1 Heliac,〔 IR-T1 〔〔 as well as low temperature devices as DC cylindrical magnetron in Prague〔〔〔〔〔 and linear magnetized plasma devices in Nancy〔 and Ljubljana.〔〔〔 == How the ball-pen probe measures the plasma potential== If a Langmuir probe (electrode) is inserted into a plasma, its potential generally lies considerably below the plasma potential $\backslash Phi$ due to what is termed a Debye sheath. Thus, the potential of Langmuir probe is named as floating potential $V\_$. Therefore, it is impossible to measure directly the plasma potential by simple Langmuir probe. The difference between plasma and floating potential is given by the electron temperature $T\_e$(): $$ V_ = \Phi - \alpha *T_e and the coefficient $\backslash alpha$. The coefficient is given by the ratio of the electron and ion saturation current density ($j^\_e$ and $j^\_i$) and collecting areas for electrons and ions ($A\_e$ and $A\_i$) $$ \alpha = ln(\frac) = ln(R) The ball-pen probe, in magnetized plasma, modifies the collecting areas for electrons and ions and makes the ratio $R$ equal to one. Thus, the coefficient $\backslash alpha$ is equal to zero and floating potential of ball-pen probe is equal to the plasma potential independently on electron temperature $$ V_ = \Phi The ball-pen probe inserted into the magnetized plasma is directly on the plasma potential without additional power supplies or electronics. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Ball-pen probe」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.