Radiation behaviour of gas and pellet refuelled high density discharges in ASDEX
Creators
- Mast, K.F.1
- Mueller, E.R.1
- Fahrbach, H.U.1
- Krause, H.1
- Lang, R.S.1
- McCarthy, P.1
- Sandmann, W.1
- Zasche, D.1
- Becker, G.1
- Bosch, H.B.1
- Brocken, H.1
- Carlson, A.1
- Eberhagen, A.1
- Fussmann, G.1
- Gehre, O.1
- Gernhardt, J.1
- Gierke, G. v.1
- Glock, E.1
- Gruber, O.1
- Haas, G.1
- Herrmann, W.1
- Hofmann, J.1
- Janeschitz, G.1
- Karger, F.1
- Kaufmann, M.1
- Klueber, O.1
- Kornherr, M.1
- Lackner, K.1
- Lenoci, M.1
- Lisitano, G.1
- Mayer, H.M.1
- McCormick, K.1
- Meisel, D.1
- Mertens, V.1
- Murmann, H.1
- Neuhauser, J.1
- Niedermeyer, H.1
- Poschenrieder, W.1
- Rapp, H.1
- Rudyj, A.1
- Schneider, F.1
- Setzensack, C.1
- Siller, G.1
- Speth, E.1
- Soeldner, F.1
- Steinmetz, K.1
- Steuer, K.H.1
- Vollmer, O.1
- Wagner, F.1
- Dodel, G.2
- Holzhauer, E.2
- Izvozchikov, A.3
- Huebner, K.4
- Pietrzyk, A.5
- Ugniewski, S.6
- 1. Max-Planck-Institut fuer Plasmaphysik, Garching (Germany, F.R.)
- 2. Stuttgart Univ. (Germany, F.R.)
- 3. AN SSSR, Leningrad. Fiziko-Tekhnicheskij Inst.
- 4. Heidelberg Univ. (Germany, F.R.)
- 5. Washington Univ., Seattle (USA)
- 6. Institute for Nuclear Studies, Swierk (Poland)
Description
Pellet and gas refuelled high density divertor discharges in ASDEX are investigated with regard to their radiation behaviour and energy balance. Exclusively ohmically heated deuterium plasmas in a non-carbonized (NC), carbonized (C) and titanium gettered (DP) vacuum vessel are considered. In gas refuelled plasmas the radiation power profiles are hollow with a central emissivity ε(0) ≤ 10mW/cm3 in C and ε(0) ≤ 40mW/cm3 in NC and DP discharges. In C discharges PRAD/PΩ rises from 0.2 at anti ne = 3.2 . 1019m-3 to 0.3 at the density limit. In NC and DP plasmas higher values from 0.3 to 0.45 are observed. Radiation from the X-points can amount to 14% of PΩ. In pellet refuelled discharges a central peaking of the emissivity ε is observed. A sudden transition from negligible or slow impurity accumulation to a fast rise could be detected in many discharges. In NC and DP pellet discharges a self-triggering of impurity accumulation was found. Measured inward drift velocities range from 60 cm/s to 130 cm/s at r=15 cm. (orig.)
Additional details
Publishing Information
- Imprint Title
- ASDEX contributions to the 14th European conference on controlled fusion and plasma physics
- Imprint Pagination
- 135 p.
- Journal Page Range
- p. 7-14.
- Report number
- IPP--III/120
Conference
- Title
- 14. European conference on controlled fusion and plasma physics.
- Dates
- 22-26 Jun 1987.
- Place
- Madrid (Spain).
INIS
- Country of Publication
- Germany
- Country of Input or Organization
- Germany
- INIS RN
- 19064778
- Subject category
- S70: PLASMA PHYSICS AND FUSION TECHNOLOGY;
- Resource subtype / Literary indicator
- Conference
- Descriptors DEI
- ASDEX TOKAMAK; DEUTERIUM; ENERGY BALANCE; PELLET INJECTION; PLASMA; POWER DENSITY; SOFT X RADIATION; THERMONUCLEAR REACTOR FUELING
- Descriptors DEC
- CLOSED PLASMA DEVICES; ELECTROMAGNETIC RADIATION; HYDROGEN ISOTOPES; IONIZING RADIATIONS; ISOTOPES; LIGHT NUCLEI; NUCLEI; ODD-ODD NUCLEI; RADIATIONS; STABLE ISOTOPES; THERMONUCLEAR DEVICES; TOKAMAK DEVICES; X RADIATION