arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv physics/0410117physics.plasm-ph
收藏

尘埃双等离子体装置中离子-离子不稳定性的观测及其抑制机制

Observation of the ion-ion instability and its suppression mechanism in a dusty double plasma device

Arun Sarma, Bornali Sarma, Codrina Ionita, Roman Schrittwieser, Yoshiharu Nakamura

摘要:

在任何等离子体系统中,离子束的逆流都会激发离子-离子不稳定性。实验观测了尘埃等离子体中离子-离子不稳定性,H2,Ar,Ar,He。该实验是在一个双等离子体装置中进行的,该装置由直径90 cm和长度120 cm组成,并由光学透明度为81%的网格隔开。使用10 mm平均灰尘分布的玻璃珠作为用于整套实验的灰尘颗粒,并且允许落在系统内的等离子体柱的特定区域内。通过相对于不同的尘埃密度组合物在空间上平移探针来观察离子-离子不稳定性的生长和抑制,并且在存在其他气体的情况下也进行比较。用射频泵浦解释了等离子体中这种不稳定性的抑制机制[1]。然而,在这个实验发现的抑制现象进行了讨论,在系统内的灰尘密度。不稳定性被发现完全抑制在一个临界粉尘密度(Ndcr)。并试图用Van der Pol方程的数值解来解释这一整套实验结果。

英文摘要:

Ion-ion instability is excited due to the counter streaming of ion beams in any plasma system. An experiment has been carried out to observe the ion-ion instability in dusty plasma and in presence of different gas compositions viz., H2, Ar, Xe and He. The experiment is performed in a double plasma device consisting of 90 cm in diameter and 120 cm in length and separated by a mesh grid of 81% optical transparency. Glass beads of 10 mm average dust distributions are used as a dust grains for the whole set of experiment and are allowed to fall within a particular region of plasma column inside the system. The growing and suppression of ion-ion instability is observed by translating the probe spatially with respect to different dust density compositions and compared the same also in presence of other gasses. The suppression mechanism of this kind of instability in plasmas was explained by RF pumps[1]. However, in this experimental finding the suppression phenomena are discussed in terms of dust density inside the system. The instability is found to be suppressed completely at a critical dust density (Ndcr). The complete set of experimental results will be tried to explain with the numerical solution of Van der Pol Equation.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑