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Edge fluctuations and global confinement with lower hybrid current drive in the ASDEX tokamak

Technical Report:

Abstract

Electrostatic edge fluctuations were investigated by means of Langmuir probes on the ASDEX tokamak in lower hybrid current drive regimes, simultaneously with the global particle and energy balances. It was found that the edge fluctuations are reduced and the global particle/energy confinement improves when the LH power is below the initial ohmic power. The maximum reduction of the fluctuations and the best confinement occur when the total power input (OH + LH) is minimum. With a LH power higher than the initial OH value, the fluctuation level increases noticeably, while no improvement of the global confinement is observed. The increase of the edge fluctuations seems to be poloidally localized and caused by local power deposition in front of the grill antenna. Therefore, the relative positions of the probe and antenna structure have to be taken account for correct interpretation of the fluctuation data. (orig.).
Authors:
Stoeckel, J; Soeldner, F X; Giannone, L.; Leuterer, F; Steuer, K H; [1]  ASDEX Team
  1. Association Euratom-Max-Planck-Institut fuer Plasmaphysik, Garching (Germany)
Publication Date:
Mar 01, 1992
Product Type:
Technical Report
Report Number:
IPP-1/268
Reference Number:
SCA: 700310; PA: DEN-93:002621; SN: 93000953250
Resource Relation:
Other Information: PBD: Mar 1992
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; TOKAMAK DEVICES; PLASMA CONFINEMENT; LOWER HYBRID CURRENT DRIVE; PLASMA INSTABILITY; PLASMA SCRAPE-OFF LAYER; MASS BALANCE; ENERGY BALANCE; ENERGY ABSORPTION; ANTENNAS; ELECTRON TEMPERATURE; ELECTRON DENSITY; EFFECTIVE CHARGE; JOULE HEATING; 700310
OSTI ID:
10132525
Research Organizations:
Max-Planck-Institut fuer Plasmaphysik, Garching (Germany)
Country of Origin:
Germany
Language:
English
Other Identifying Numbers:
Other: ON: DE93771969; TRN: DE9302621
Availability:
OSTI; NTIS (US Sales Only); INIS
Submitting Site:
DEN
Size:
17 p.
Announcement Date:
Jul 04, 2005

Technical Report:

Citation Formats

Stoeckel, J, Soeldner, F X, Giannone, L., Leuterer, F, Steuer, K H, and ASDEX Team. Edge fluctuations and global confinement with lower hybrid current drive in the ASDEX tokamak. Germany: N. p., 1992. Web.
Stoeckel, J, Soeldner, F X, Giannone, L., Leuterer, F, Steuer, K H, & ASDEX Team. Edge fluctuations and global confinement with lower hybrid current drive in the ASDEX tokamak. Germany.
Stoeckel, J, Soeldner, F X, Giannone, L., Leuterer, F, Steuer, K H, and ASDEX Team. 1992. "Edge fluctuations and global confinement with lower hybrid current drive in the ASDEX tokamak." Germany.
@misc{etde_10132525,
title = {Edge fluctuations and global confinement with lower hybrid current drive in the ASDEX tokamak}
author = {Stoeckel, J, Soeldner, F X, Giannone, L., Leuterer, F, Steuer, K H, and ASDEX Team}
abstractNote = {Electrostatic edge fluctuations were investigated by means of Langmuir probes on the ASDEX tokamak in lower hybrid current drive regimes, simultaneously with the global particle and energy balances. It was found that the edge fluctuations are reduced and the global particle/energy confinement improves when the LH power is below the initial ohmic power. The maximum reduction of the fluctuations and the best confinement occur when the total power input (OH + LH) is minimum. With a LH power higher than the initial OH value, the fluctuation level increases noticeably, while no improvement of the global confinement is observed. The increase of the edge fluctuations seems to be poloidally localized and caused by local power deposition in front of the grill antenna. Therefore, the relative positions of the probe and antenna structure have to be taken account for correct interpretation of the fluctuation data. (orig.).}
place = {Germany}
year = {1992}
month = {Mar}
}