Electric currents in the scrape-off layer in ASDEX Upgrade
Scrape-off layer (SOL) currents are measured by means of Langmuir probes and shunts in the divertor of ASDEX Upgrade. They consist of the overlaid contributions of thermoelectric and Pfirsch-Schl³ter (PS) currents. The SOL currents exhibit a drastic decrease when the line-averaged density approaches the Greenwald density in the H-mode. An analytical model is presented which reproduces the measured thermoelectric current quantitatively. Matching of the analytical model with the measured current scaling yields information about divertor temperatures and SOL e-folding lengths.
Bibliographic Reference: An article published in: Elsevier; Journal of Nuclear Materials. 290-293 (2001) pp.639-643
Availability: An article published in: Elsevier; Journal of Nuclear Materials. 290-293 (2001) pp.639-643
Record Number: 200013432 / Last updated on: 2001-06-27
Original language: en
Available languages: en