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The isotope effect in ASDEX

Technical Report:

Abstract

This paper describes the effect of the isotopic mass on plasma parameters as observed in the ASDEX tokamak. The paper comprises Ohmic as well as L-mode, H-mode and H{sup *}-mode scenarios. The measurements reveal that the ion mass is a substantial and robust parameter which affects all confinement times (energy, particle and momentum) in the whole operational window. Both, core properties like the sawtooth repetition time and edge properties like the separatrix density change with the isotopic mass. Specific emphasis is given to the edge parameters and changes of the edge plasma due to different wall conditioning such as carbonization and boronization. The pronounced isotope dependence of edge and divertor parameters are explained by the secondary effect of different power fluxes into the scrape-off layer plasma and onto the divertor plates. Finally, the observations serve to test different transport theories. With respect to the ion temperature gradient driven turbulence, the isotope effect is also studied in pellet refuelled discharges with peaked density profiles. The results from ASDEX are compared with those from other experiments. (orig.)
Publication Date:
Jan 01, 1993
Product Type:
Technical Report
Report Number:
IPP-3/189
Reference Number:
SCA: 700460; 700410; PA: DEN-94:0F0661; EDB-94:027942; ERA-19:007877; NTS-94:015641; SN: 94001136108
Resource Relation:
Other Information: PBD: Jan 1993
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; TOKAMAK DEVICES; PLASMA CONFINEMENT; JOULE HEATING; CONFINEMENT TIME; ISOTOPE EFFECTS; PLASMA SCRAPE-OFF LAYER; PELLET INJECTION; ION TEMPERATURE; DIVERTORS; ENERGY LOSSES; PARTICLE LOSSES; PLASMA INSTABILITY; 700460; 700410; HEATING AND FUELING SYSTEMS; FUELS; SPECIFIC FUSION DEVICES AND EXPERIMENTS
OSTI ID:
10119768
Research Organizations:
Max-Planck-Institut fuer Plasmaphysik, Garching (Germany)
Country of Origin:
Germany
Language:
English
Other Identifying Numbers:
Other: ON: DE94734002; TRN: DE94F0661
Availability:
OSTI; NTIS (US Sales Only); INIS
Submitting Site:
DEN
Size:
75 p.
Announcement Date:
Jun 30, 2005

Technical Report:

Citation Formats

Bessenrodt-Weberpals, M, Wagner, F, and ASDEX Team. The isotope effect in ASDEX. Germany: N. p., 1993. Web.
Bessenrodt-Weberpals, M, Wagner, F, & ASDEX Team. The isotope effect in ASDEX. Germany.
Bessenrodt-Weberpals, M, Wagner, F, and ASDEX Team. 1993. "The isotope effect in ASDEX." Germany.
@misc{etde_10119768,
title = {The isotope effect in ASDEX}
author = {Bessenrodt-Weberpals, M, Wagner, F, and ASDEX Team}
abstractNote = {This paper describes the effect of the isotopic mass on plasma parameters as observed in the ASDEX tokamak. The paper comprises Ohmic as well as L-mode, H-mode and H{sup *}-mode scenarios. The measurements reveal that the ion mass is a substantial and robust parameter which affects all confinement times (energy, particle and momentum) in the whole operational window. Both, core properties like the sawtooth repetition time and edge properties like the separatrix density change with the isotopic mass. Specific emphasis is given to the edge parameters and changes of the edge plasma due to different wall conditioning such as carbonization and boronization. The pronounced isotope dependence of edge and divertor parameters are explained by the secondary effect of different power fluxes into the scrape-off layer plasma and onto the divertor plates. Finally, the observations serve to test different transport theories. With respect to the ion temperature gradient driven turbulence, the isotope effect is also studied in pellet refuelled discharges with peaked density profiles. The results from ASDEX are compared with those from other experiments. (orig.)}
place = {Germany}
year = {1993}
month = {Jan}
}