Other
Scientific paper
May 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agusmsm32a..01h&link_type=abstract
American Geophysical Union, Spring Meeting 2002, abstract #SM32A-01
Other
7807 Charged Particle Motion And Acceleration, 7815 Electrostatic Structures, 7831 Laboratory Studies, 7867 Wave/Particle Interactions
Scientific paper
The formation and control of plasma potential along magnetic-field lines have attracted general attention in laboratory and space plasmas because the potential structure holds the key of wave-nonlinear development, charged-particle acceleration, plasma confinement, and particle transport. According to geophysical or space observations, intense electrostatic and electromagnetic emissions have been measured in a large frequency range. These fluctuations have been considered to play important roles in the plasma heating involved in auroral double-layer formation. Concerning this double-layer formation, we experimentally demonstrate a novel scenario for the formation of the local potential structure due to electron cyclotron resonance (ECR) under inhomogeneous magnetic-field configurations in a laboratory plasma. Here, our goal is to clarify the mechanism of the potential formation and details of a relation between the potential structure and particle deceleration/acceleration. Experiments have been performed in the QT-upgrade machine of Tohoku University under various kinds of inhomogeneous magnetic-field configurations, where a fully-ionized collisionless plasma flow is injected from one end of the linear machine. A microwave is launched into the plasma from the other end, propagating axially toward the plasma source, and the ECR takes place in the middle section of the machine. In the case of a converging magnetic field, a potential structure is observed to consist of a negative potential dip around the ECR point and a subsequent positive potential hump. This potential structure gradually collapses in the time scale determined by the ion-flow speed. When ECR takes place in a diverging magnetic field, on the other hand, there appears a strong potential drop along the field lines, which results from a field-aligned electron acceleration, being accompanied by an effective ion acceleration. The potential formations described above are explained by the selective electron-deceleration/acceleration parallel to the field lines due to ECR and electrostatic ion-deceleration/acceleration self-consistently organized under the condition of quasi-neutrality.
Hatakeyama Rikizo
Kaneko Tak
Sato Naoko
No associations
LandOfFree
Field-Aligned Plasma Potential Formation Due to Local Electron Cyclotron Resonance Under Inhomogeneous Magnetic-Field Configurations does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Field-Aligned Plasma Potential Formation Due to Local Electron Cyclotron Resonance Under Inhomogeneous Magnetic-Field Configurations, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Field-Aligned Plasma Potential Formation Due to Local Electron Cyclotron Resonance Under Inhomogeneous Magnetic-Field Configurations will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1724515