ASDEX Upgrade

Topical Research



Important results from the research at ASDEX Upgrade are regularily summarized in the Annual Reports of the Max-Planck-Institut für Plasmaphysik. Latest results and recent developments are published in the ASDEX Upgrade Letters.

In 2006, the chapters from the annual report which are relevant for ASDEX Upgrade included the following topics:

  1. Overview (page 3)
    1. Scientific aims and operation
    2. Main results in 2006 and relevance for ITER
    3. Technical enhancements and programme in 2007
  2. Improved H-modes: Physics, operational range and extrapolation to ITER (page 5)
  3. Turbulence and zonal flow physics (page 6)
    1. Core ITG & TEM turbulence transitions
    2. Zonal flows and GAMs
  4. Loss of fast ions due to MHD modes (page 8)
    1. Fast particles physics: a keyword in the AUG programme
    2. Fast particles losses driven by Neoclassical Tearing Modes (NTM)
    3. Fast particle losses due to TAE and other high frequency modes
  5. Stabilization of MHD modes by ECCD (page 9)
  6. Filamentary transport (page 11)
  7. Technical systems (page 12)
    1. Machine core
    2. Preparation of an all W first wall
    3. Control, data acquisition and computer infrastructure
    4. Neutral beam heating
    5. Ion Cyclotron Heating
    6. Electron Cyclotron Resonance Heating
  8. Core plasma physics (page 15)
    1. Reconstruction of the internal loop voltage profile
    2. Effect of density peaking on Zeff profiles
    3. Radial Correlation Lengths of the Turbulence
    4. Non-parametric profile gradient estimation
    5. βN dependence of heat transport
    6. Stochasticity during MHD mode interactions
    7. Tungsten proves compatible with ITER-relevant plasma edge
    8. Scaled ITER performance
  9. Edge and divertor physics (page 19)
    1. Deconvolution of Dα emission profiles and penetration of neutrals
    2. Target power and current asymmetries during type-I ELMs
    3. Modelling of divertor detachment
    4. Plasma flow in the far SOL
    5. Impurity fluxes in the Scrape Off Layer
    6. 13C migration
    7. Tungsten erosion during ICRH operation
    8. Tungsten erosion during ELMs
    9. Long term evolution of carbon with increasing tungsten coverage of PFCs
    10. Oxygen wall cleaning
  10. Stuttgart University (page 22)
    1. High-power microwave technology
    2. Conformal gratings for multi-pass ECRH with 2nd harmonic O2-mode or 3rd harmonic X3 mode
    3. Turbulence studies in the scrape-off layer

ASDEX Upgrade Letters

Up to now the following ASDEX Upgrade Letters are published with these topics:

No. 9 (April 2007):
  • The 2007 experimental campaign
  • Optimised stabilization of NTMs with modulated ECCD
  • New project structure of ASDEX Upgrade and planning of enhancements
No. 8 (March 2006):
  • New Plasma Control System at ASDEX Upgrade
  • Observations of MHD Induced Fast Ion Losses
  • Start of the 2006 experimental campaign
No. 7 (March 2005):
  • Possibilities for ASDEX Upgrade Hardware Extensions
  • Integrated exhaust control in ASDEX Upgrade
  • Preparation of the 2005 experimental campaign
No. 6 (April 2004):
  • ELM pace making and mitigation by pellets
  • Ion temperature edge measurements
  • Upgrade of magnetic measurements
  • Status Report on current ASDEX Upgrade campaign
No. 5 (October 2003):
  • Confirmation of ASDEX Upgrade?s "Improved H-mode" Scenario by JET - Good news for ITER
  • Type-I ELM target heat load structures
  • Extended dynamic capabilities of power supplies
No. 4 (May 2003):
  • Suppression of 2/1 NTMs with ECCD
  • Quiescent H-mode in ASDEX Upgrade
  • Discharges with extreme triangularity δ=0.55 commissioned
  • ASDEX Upgrade weekly operation meeting broadcasted routinely on Monday mornings
No. 3 (November 2002):
  • Preparation of 2003 Experimental Campaigns
  • ASDEX Upgrade pulse with 10 s flattop of plasma current
  • ICRF ion heating with mode conversion
  • New Task Force Structure for Experimental Campaigns 2003/4
No. 2 (June 2002):
  • Improved Tools for Remote Participation
  • Tungsten as an Option for the Reactor First Wall
No. 1 (March 2002):
  • ASDEX Upgrade on the way to a European Fusion Facility
  • Progress towards integrated scenario development
  • The ASDEX Upgrade Scientific Programme
  • Task Forces

 





 

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002: An improved H-mode at q95=3.17 (1.2MA/2.0T, #20449), achieving H98(y,2)=1.4 at ?N=2.9, with fishbone activity in the centre keeping the q-profile stationary.

An improved H-mode at q95=3.17 (1.2MA/2.0T, #20449), achieving H98(y,2)=1.4 at ?N=2.9, with fishbone activity in the centre keeping the q-profile stationary.



003: Spectrogram of an FILD channel, showing fast ion losses correlated with various types of MHD activitiy

Spectrogram of an FILD channel, showing fast ion losses correlated with various types of MHD activitiy



004: Poincare plots for interaction of (3,2) tearing mode, (4,3) ideal mode and (1,1) ideal modes. Stochastic region is clearly seen in figure for experimental perturbations.

Poincare plots for interaction of (3,2) tearing mode, (4,3) ideal mode and (1,1) ideal modes. Stochastic region is clearly seen in figure for experimental perturbations.