Abstract
The ergodic magnetic limiter coils on TEXT have been reconfigured to produce the primary helical perturbation resonance at m = 7 n = 3. The experiments continue to demonstrate that the weak resonant perturbations modify the edge conditions in keeping with model predictions. We observe a reduction in the intrinsic impurity levels accompanying the helical current pulse, presumably the result of a reduction in the electron temperature in the edge. Heat follows the perturbed field lines to the limiter, generating heat load patterns which reflect the geometry of a magnetic island-limiter intersection. A strong spatial modulation of the electron density in the scrape-off-layer also reflects the helical mode structure.
Original language | English |
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Pages (from-to) | 266-270 |
Number of pages | 5 |
Journal | Journal of Nuclear Materials |
Volume | 128-129 |
Issue number | C |
DOIs | |
State | Published - Dec 1984 |
Externally published | Yes |
Funding
This work is supportedb y USDOE Contract No. DE-ATO3-84ERS1044.W e thank F.W. McClain for assistancein magneticf ield line computationsa nd ac-knowledgem any helpful discussionsw ith H. Ikezi and T. Taylor.
Keywords
- Langmuir probe
- TEXT
- ergodic magnetic limiter