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Origin of hot ions observed in a modified penning discharge
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Roth, J. R. |
| Copyright Year | 1971 |
| Description | Ions with a Maxwellian energy distriubtion and kinetic temperatures ranging from below 100 eV to several keV are observed in a steady state modified Penning discharge. Observations in the plasma, with capacitive probes at several azimuthal locations, are consistent with the existence of two distinct spokes rotating with different velocities in the sheath between the plasma and the anode ring. The faster (0.5 to 10 MHz) spoke consists of electrons rotating with the E/B drift velocity. The slow (0.1 to 1.0 MHz) spoke consists of ions whose measured thermal velocity is directly proportional to the spoke velocity. The interaction of the two spokes is apparently responsible for the observed electrostatic turbulence and ion thermalization. The anode sheath thickness is smaller than the ion gyrodiameter in this plasma. Thus the ions are in the electric field of the sheath for only a fraction of their orbit, and their E/B drift (spoke) velocity is smaller than that of the electrons. |
| File Size | 749969 |
| Page Count | 17 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19720005086 |
| Archival Resource Key | ark:/13960/t88h3ck1f |
| Language | English |
| Publisher Date | 1971-01-01 |
| Access Restriction | Open |
| Subject Keyword | Plasma Diagnostics Ion Temperature Energy Distribution Ions Penning Discharge Plasma Sheaths Plasma Heating Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
