Study of quiescent H-mode plasmas in ASDEX Upgrade
Creators
- 1. Max-Planck-Institut fuer Plasmaphysik, EURATOM Association, D-85740 Garching (Germany)
- 2. Associacao EURATOM/IST, Centro de Fusao Nuclear, Instituto Superior Tecnico, 1049-001 Lisbon (Portugal)
- 3. Euratom-TEKES Association, Helsinki University of Technology, PO Box 2200, FIN-02015 HUT (Finland)
Description
In a recent campaign with counter-current neutral beam injection (NBI), the quiescent high confinement mode (QH-mode) is studied in ASDEX Upgrade. The QH-mode regime is obtained with all accessible NBI angles, with and without additional ion cyclotron heating, at various values of edge safety factor q95 and at values of Zeff down to 2.5 after fresh boronization. In contrast to the ELMy H-mode, the pedestal pressure depends significantly on radial heat flux in the QH-mode, giving rise to a reduced heating power degradation of H-mode confinement. The 'edge harmonic oscillation', a characteristic MHD feature of the QH-mode that replaces ELMs, occurs at rational surfaces in the H-mode barrier region, and has so far been found only with a toroidal mode number n = 1. These conditions seem to define windows in q95 for favourable QH-mode access
Availability note (English)
Available online at http://stacks.iop.org/0741-3335/46/A151/ppcf4_5A_016.pdf or at the Web site for the journal Plasma Physics and Controlled Fusion (ISSN 1361-6587) http://www.iop.org/Additional details
Identifiers
- URL
- http://stacks.iop.org/0741-3335/46/A151/ppcf4_5A_016.pdf; http://www.iop.org/;
- DOI
- 10.1088/0741-3335/46/5A/016;
- PII
- S0741-3335(04)70209-2;
Publishing Information
- Journal Title
- Plasma Physics and Controlled Fusion
- Journal Volume
- 46
- Journal Issue
- 5A
- Journal Page Range
- p. A151-A156
- ISSN
- 0741-3335
- CODEN
- PPCFET
Conference
- Title
- 9. IAEA technical committee meeting on H-mode physics and transport barriers
- Dates
- 24-26 Sep 2003
- Place
- San Diego, CA (United States)
INIS
- Country of Publication
- United Kingdom
- Country of Input or Organization
- International Atomic Energy Agency (IAEA)
- INIS RN
- 35077552
- Subject category
- S70: PLASMA PHYSICS AND FUSION TECHNOLOGY;
- Resource subtype / Literary indicator
- Conference
- Descriptors DEI
- ASDEX TOKAMAK; BEAM INJECTION HEATING; EDGE LOCALIZED MODES; H-MODE PLASMA CONFINEMENT; NEUTRAL ATOM BEAM INJECTION
- Descriptors DEC
- BEAM INJECTION; CLOSED PLASMA DEVICES; CONFINEMENT; HEATING; INSTABILITY; MAGNETIC CONFINEMENT; PLASMA CONFINEMENT; PLASMA HEATING; PLASMA INSTABILITY; PLASMA MACROINSTABILITIES; THERMONUCLEAR DEVICES; TOKAMAK DEVICES
Optional Information
- Collaborations
- ASDEX Upgrade Team