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Edge plasma characteristics in the helicity injected torus (HIT-II) spherical tokamak
| Content Provider | Scilit |
|---|---|
| Author | Jain, K. K. Redd, A. J. Jarboe, T. R. Nelson, B. A. |
| Copyright Year | 2003 |
| Description | Journal: Plasma Physics and Controlled Fusion The helicity injected torus (HIT-II) device is a spherical tokamak capable of both inductive (Ohmic) and co-axial helicity injection (CHI) current drive. The HIT-II plasma edge, in both Ohmic and CHI discharges, has been characterized using a triple Langmuir probe. An Ohmic discharge develops in two phases, a slide-away phase followed by a normal Ohmic discharge. During the normal Ohmic discharge, the floating potential is negative, just as in a conventional large-aspect-ratio tokamak. The plasma density increases sharply from the plasma edge into the centre. The auto-power spectrum of Ohmic plasma edge fluctuations shows a nearly constant auto-power at low frequencies, with auto-power decreasing at higher frequencies, similar to observations in conventional large-aspect-ratio tokamaks. In HIT-II CHI discharges, the magnetic field lines at the plasma edge are clearly connected to the injector electrodes, as expected. However, the time-evolution of the floating potential in the core plasma is significantly different from that of the edge, which may indicate a decoupling of the core plasma from the CHI electrodes. Finally, the fluctuations at the edge of high-performance CHI discharges exhibit a coherent oscillation at a frequency similar to that of the observed n = 1 mode. |
| Related Links | http://iopscience.iop.org/article/10.1088/0741-3335/45/7/316/pdf |
| Ending Page | 1295 |
| Page Count | 13 |
| Starting Page | 1283 |
| ISSN | 07413335 |
| e-ISSN | 13616587 |
| DOI | 10.1088/0741-3335/45/7/316 |
| Journal | Plasma Physics and Controlled Fusion |
| Issue Number | 7 |
| Volume Number | 45 |
| Language | English |
| Publisher | IOP Publishing |
| Publisher Date | 2003-06-05 |
| Access Restriction | Open |
| Subject Keyword | Journal: Plasma Physics and Controlled Fusion Nuclear Energy and Engineering Plasma Edge Chi Discharges |
| Content Type | Text |
| Resource Type | Article |
| Subject | Condensed Matter Physics Nuclear Energy and Engineering |
