New advanced operational regime on the W7-AS stellarator
A promising new plasma operational regime on the Wendelstein stellarator W7-AS has been discovered. It is extant above a threshold density and characterized by flat density profiles, high energy and low impurity confinement times, and edge-localized radiation. Impurity accumulation is avoided. Quasi...
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| Published in | Physical review letters Vol. 89; no. 1; p. 015001 |
|---|---|
| Main Authors | , , , , , , , , , , , , , , , , , , , , , , , , , , , |
| Format | Journal Article |
| Language | English |
| Published |
United States
01.07.2002
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| Online Access | Get more information |
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| Abstract | A promising new plasma operational regime on the Wendelstein stellarator W7-AS has been discovered. It is extant above a threshold density and characterized by flat density profiles, high energy and low impurity confinement times, and edge-localized radiation. Impurity accumulation is avoided. Quasistationary discharges with line-averaged densities n(e) to 4 x 10(20) m(-3), radiation levels to 90%, and partial plasma detachment at the divertor target plates can be simultaneously realized. Energy confinement is up to twice that of a standard scaling. At B(t) = 0.9 T, an average beta value of 3.1% is achieved. The high n(e) values allow demonstration of electron Bernstein wave heating using linear mode conversion. |
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| AbstractList | A promising new plasma operational regime on the Wendelstein stellarator W7-AS has been discovered. It is extant above a threshold density and characterized by flat density profiles, high energy and low impurity confinement times, and edge-localized radiation. Impurity accumulation is avoided. Quasistationary discharges with line-averaged densities n(e) to 4 x 10(20) m(-3), radiation levels to 90%, and partial plasma detachment at the divertor target plates can be simultaneously realized. Energy confinement is up to twice that of a standard scaling. At B(t) = 0.9 T, an average beta value of 3.1% is achieved. The high n(e) values allow demonstration of electron Bernstein wave heating using linear mode conversion. |
| Author | McCormick, K Klinger, T Giannone, L Werner, A Brakel, R Feng, Y Jaenicke, R Naujoks, D Niedermeyer, H Wenzel, U Weller, A Burhenn, R Kisslinger, J Gadelmeier, F Knauer, J P Sardei, F Ehmler, H Laqua, H P Ramasubramanian, N Grigull, P Pasch, E Hirsch, M Hildebrandt, D Klose, S Rust, N Kühner, G Wagner, F König, R |
| Author_xml | – sequence: 1 givenname: K surname: McCormick fullname: McCormick, K email: Kent.McCormick@ipp.mpg.de organization: Max-Planck-Institut für Plasmaphysik, EURATOM Association, D-85748 Garching, Germany. Kent.McCormick@ipp.mpg.de – sequence: 2 givenname: P surname: Grigull fullname: Grigull, P – sequence: 3 givenname: R surname: Burhenn fullname: Burhenn, R – sequence: 4 givenname: R surname: Brakel fullname: Brakel, R – sequence: 5 givenname: H surname: Ehmler fullname: Ehmler, H – sequence: 6 givenname: Y surname: Feng fullname: Feng, Y – sequence: 7 givenname: F surname: Gadelmeier fullname: Gadelmeier, F – sequence: 8 givenname: L surname: Giannone fullname: Giannone, L – sequence: 9 givenname: D surname: Hildebrandt fullname: Hildebrandt, D – sequence: 10 givenname: M surname: Hirsch fullname: Hirsch, M – sequence: 11 givenname: R surname: Jaenicke fullname: Jaenicke, R – sequence: 12 givenname: J surname: Kisslinger fullname: Kisslinger, J – sequence: 13 givenname: T surname: Klinger fullname: Klinger, T – sequence: 14 givenname: S surname: Klose fullname: Klose, S – sequence: 15 givenname: J P surname: Knauer fullname: Knauer, J P – sequence: 16 givenname: R surname: König fullname: König, R – sequence: 17 givenname: G surname: Kühner fullname: Kühner, G – sequence: 18 givenname: H P surname: Laqua fullname: Laqua, H P – sequence: 19 givenname: D surname: Naujoks fullname: Naujoks, D – sequence: 20 givenname: H surname: Niedermeyer fullname: Niedermeyer, H – sequence: 21 givenname: E surname: Pasch fullname: Pasch, E – sequence: 22 givenname: N surname: Ramasubramanian fullname: Ramasubramanian, N – sequence: 23 givenname: N surname: Rust fullname: Rust, N – sequence: 24 givenname: F surname: Sardei fullname: Sardei, F – sequence: 25 givenname: F surname: Wagner fullname: Wagner, F – sequence: 26 givenname: A surname: Weller fullname: Weller, A – sequence: 27 givenname: U surname: Wenzel fullname: Wenzel, U – sequence: 28 givenname: A surname: Werner fullname: Werner, A |
| BackLink | https://www.ncbi.nlm.nih.gov/pubmed/12097046$$D View this record in MEDLINE/PubMed |
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