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Titolo:
Refuelling performance improvement by high speed pellet launch from the magnetic high field side
Autore:
Lang, PT; Lorenz, A; Mertens, V; Fuchs, JC; Gafert, J; Gehre, O; Gruber, O; Haas, G; Kaufmann, M; Kurzan, B; Maraschek, M; Muller, HW; Murmann, HD; Neuhauser, J; Reich, M; Schneider, W; Vergamota, S;
Indirizzi:
EURATOM Assoc, Max Planck Inst Plasmaphys, Garching, Germany EURATOM Assoc Garching Germany lanck Inst Plasmaphys, Garching, Germany Inst Super Tecn, EURATOM Assoc, Ctr Fusao Nucl, Lisbon, Portugal Inst Super Tecn Lisbon Portugal Assoc, Ctr Fusao Nucl, Lisbon, Portugal
Titolo Testata:
NUCLEAR FUSION
fascicolo: 8, volume: 41, anno: 2001,
pagine: 1107 - 1112
SICI:
0029-5515(200108)41:8<1107:RPIBHS>2.0.ZU;2-Y
Fonte:
ISI
Lingua:
ENG
Soggetto:
H-MODE DISCHARGES; ASDEX UPGRADE; INJECTION; DRIFT;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
17
Recensione:
Indirizzi per estratti:
Indirizzo: Lang, PT EURATOM Assoc, Max Planck Inst Plasmaphys, Garching, Germany EURATOM Assoc Garching Germany t Plasmaphys, Garching, Germany
Citazione:
P.T. Lang et al., "Refuelling performance improvement by high speed pellet launch from the magnetic high field side", NUCL FUSION, 41(8), 2001, pp. 1107-1112

Abstract

Limited available pellet velocities have so far restricted the refuelling performance of efficient, launch schemes from the tokamak magnetic high field side (HFS). Although pellet injection (hiring II mode has resulted in more peaked density profiles and enhanced performance with respect to gas puff refuelling, prompt particle and energy losses caused by pellet induced ELM bursts have still limited the extension of the operational area, Now, thepreliminary version of a new optimized pellet injection set-up at ASDEX Upgrade allows for significantly higher injection speeds when launching pellets from the magnetic HFS. Intact pellets with velocities up to vp = 560 m/swere successfully injected instead of the v(P) = 240 m/s available with the previous set-up. The velocity increase results in a deeper pellet penetration and seems to follow the v(P)(1/3) scaling derived from a multimachine study using conventional pellet launch from the torus outside. The inward shift uf the pellet particle deposition profile with respect tu the penetration depths turned out to be approximately the same for both launch velocities. The respectively achieved deeper particle deposition inside the plasma column reduced the particle and energy loss rates during the immediate post-pellet phase. Thus, further enhancement of tokamak operation in the high density regime seems feasible by means of high speed pellets launched from the torus inner side.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 10/07/20 alle ore 11:45:34