Nonlinear Waves in a Finite Plasma

有限等离子体中的非线性波

• 批准号: 63580013
• 负责人: KAWAI Yoshinobu
• 金额: $ 1.22万
• 依托单位: Kyushu University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1988
• 资助国家: 日本
• 起止时间: 1988 至 1990
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-63580013/
• 关键词: Finite Plasma; Ion Acoustic Wave; Reflection Coefficient; Double Plasma; Ion-Ion Instability; Electron Beam-Plasma System; Beam Mode; Subharmonics; イオン波の反射; イオン・イオン不安定性; ポンプ波; ビ-ム・ラングミュアモ-ド; 定常シ-ス; ソリトン; イオンシース

We have studied both theoretically and experimentally nonlinear phenomena in a finite plasma without magnetic fields, and the following results are obtained.1. We examined the characteristics of the ion acoustic wave reflected by the boundary. The main results are as follows :(i) The particles trapped in the sheath formed around a negatively biased grid play an important role in the wave reflection.(ii) When an ion acoustic solution propagates into the sheath, the reflected wave becomes a solution for the large amplitude, and an ion acoustic wave for the small amplitude, respectively.(iii) The experiments on the reflection of ion waves are carried out using the DP machine. It is found that ions play an important role in the reflection, and the reflection coefficient does not depend on the frequency for the beam modes and it is decreasing function of frequency for the ion acousti wave.2. We attempted the suppression of the ion-ion instability by an external field and found that the threshold value at which the instability is suppressed depends on the frequency of the external field.3. We observed the mode transition of the electron beam-plasma instability : from the beam mode to the beam Langmuir mode.4. We succeeded in the excitation of the subharmonics of the beam mode. The subharmonics may be excited by period doubling.These results will contribute to the development of nonlinear phenomena in plasmas.

我们已经在没有磁场的有限血浆中研究了理论和实验性非线性现象，并获得了以下结果。1。我们检查了边界反射的离子声波的特性。主要结果如下：（i）被困在围绕造成负面偏见的鞘中的颗粒在波浪反射中起重要作用。（ii）当离子溶液传播到护套中时，反射的波成为大型振幅的解决方案，并且是对小幅度的振幅振幅的振幅，而不是弹性的弹性，而远程的范围（III）。 DP机器。发现离子在反射中起着重要作用，并且反射系数不取决于梁模式的频率，并且它是离子Acousti Wave的频率的降低功能。2。我们尝试通过外场抑制离子离子不稳定性，发现抑制不稳定性的阈值取决于外部场的频率3。我们观察到电子束束 - 气值不稳定性的模式转变：从梁模式到梁langmuir模式4。我们成功地激发了光束模式的亚肝素。这些结果可能会因等离子体中非线性现象的发展而受到倍增。

项目成果

Shunichi NODA.: Jpn.J.AppI.Phys.27. 1562-1563 (1988)

野田俊一：Jpn.J.AppI.Phys.27。

Takashi SATO: "SeHーFocusimg of Iom wave in plasma with Negative Ion" J.Phys.Soc.Jpn.59. 159-165 (1990)

Takashi SATO：“负离子等离子体中 Iom 波的 SeH-Focusimg”J.Phys.Soc.Jpn.59 (1990)。

Takashi SATO: "SelfーFocusing of Ion Wave in Plasma with Negative Ion" J.Phys.Soc.Jpn.59. 159-165 (1990)

Takashi SATO：“负离子等离子体中离子波的自聚焦”J.Phys.Soc.Jpn.59 (1990)。

Toshirou KASUYA: "Observations of Subharmonic Waves in an Electron Beam Plasma System" J.Phys.Soc.Jpn.59. 3931-3936 (1990)

Toshirou KASUYA：“电子束等离子体系统中次谐波的观察”J.Phys.Soc.Jpn.59。

Toshirou kasuya, Masayoshi Tanaka, Akio Komori and Yoshinobu Kawai: "Observations of Subharmonic Waves in an Electron Beam Plasma System" J. Phys. Soc. Jpn.59. 3931-3936 (1990)

Toshirou kasuya、Masayoshi Tanaka、Akio Komori 和 Yoshinobu Kawai：“电子束等离子体系统中次谐波的观察”J. Phys。