English
 
User Manual Privacy Policy Disclaimer Contact us
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT
  A new quasi-stationary, very high density plasma regime on the W7-AS stellarator

Jaenicke, R., Bäumel, S., Baldzuhn, J., Brakel, R., Burhenn, R., Ehmler, H., et al. (2002). A new quasi-stationary, very high density plasma regime on the W7-AS stellarator. Plasma Physics and Controlled Fusion, 44(Suppl. 12B), B193-B205.

Item is

Basic

show hide
Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0027-41CD-7 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0027-41CE-5
Genre: Journal Article

Files

show Files

Locators

show

Creators

show
hide
 Creators:
Jaenicke, R.1, 2, Author              
Bäumel, S.2, Author              
Baldzuhn, J.3, Author              
Brakel, R.2, Author              
Burhenn, R.1, 4, Author              
Ehmler, H.5, Author              
Endler, M.5, Author              
Erckmann, V.1, 2, Author              
Feng, Y.1, 2, Author              
Gadelmeier, F.3, Author              
Geiger, J.2, Author              
Giannone, L.1, 2, 6, Author              
Grigull, P.7, Author              
Hartfuß, H.-J.2, Author              
Hartmann, D.8, Author              
Hildebrandt, D.9, Author              
Hirsch, M.2, Author              
Holzhauer, E.3, Author              
Kick, M.3, Author              
Kisslinger, J.1, 2, Author              
Klinger, T.4, 5, Author              Klose, S.9, 10, Author              Knauer, J.1, 2, Author              König, R.5, Author              Kühner, G.1, 2, Author              Laqua, H.1, 2, 11, Author              Maaßberg, H.1, 2, Author              McCormick, K.5, Author              Narayanan, R.5, Author              Niedermeyer, H.11, Author              Pasch, E.12, Author              Ruhs, N.3, Author              Rust, N.13, Author              Saffert, J.3, Author              Sardei, F.2, Author              Schneider, F.3, Author              Schubert, M.6, Author              Speth, E.8, Author              Wagner, F.2, Author              Weller, A.2, 5, Author              Wenzel, U.9, Author              Werner, A.7, Author              Würsching, E.6, Author               more..
Affiliations:
1W7-AS, Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856310              
2Experimental Plasma Physics 3 (E3), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856291              
3External Organizations, ou_persistent22              
4VINETA, Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856311              
5Stellarator Scenario Development (E5), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856285              
6Experimental Plasma Physics 1 (E1), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856295              
7W7-X: Physics (PH), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856305              
8Technology (TE), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856318              
9Plasma Diagnostics Group (HUB), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856324              
10Experimental Plasma Physics 2 (E2), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856292              
11W7-X: Construction, Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856314              
12Stellarator Optimisation (E3), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856329              
13W7-X: Heating (HT), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856343              

Content

show
hide
Free keywords: -
 Abstract: Stellarators have the intrinsic property of steady state operation. However, on present-day stellarators the pulse length is usually not only limited due to technical reasons, but also by physical problems. Lack of density control and a subsequent radiation collapse terminate the discharges quite often at high densities. To improve the control of the plasma- wall interaction, the island divertor concept was developed for optimized stellarators. To test this divertor concept on W7-AS, all limiters were removed and replaced by ten divertor modules. In subsequent divertor experiments a promising new plasma operational regime has been discovered which is termed 'high density H-mode' (HDH-mode). During the transition into that regime a clear reduction of ELM-like events and turbulent fluctuations is observed. The HDH-mode combines good energy confinement with very low impurity confinement resulting in low core radiation, but high edge-localized radiation. Consequently, stationary discharges at densities of typically 2 x 10(20) m(-3) can be performed within the accessible pulse length of about 1 s. At densities above 3 x 10(20 m-3) a controlled transition from attached to partially detached plasmas is observed. The still edge-localized radiation reaches 90% of the heating power so that the power load onto the divertor target plates is further reduced. At a lower toroidal field of 0.9 T average beta-values could be raised from earlier 2% to more than 3% in magnetic field configurations with rather smooth flux surfaces at the plasma boundary. The recently obtained results render excellent prospects for W7-X, the larger superconducting successor experiment of W7-AS.

Details

show
hide
Language(s): eng - English
 Dates: 2002
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: eDoc: 20525
ISI: 000180907400017
 Degree: -

Event

show

Legal Case

show

Project information

show

Source 1

show
hide
Title: Plasma Physics and Controlled Fusion
  Alternative Title : Plasma Phys. Control. Fusion
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: -
Pages: - Volume / Issue: 44 (Suppl. 12B) Sequence Number: - Start / End Page: B193 - B205 Identifier: ISSN: 0741-3335