Error Field Modes in JET and COMPASS-D and Implications for ITER

摘要

1. Small m=2, n=1 resonant magnetic perturbations (RMP) are responsible at low electron density (ne) for the onset of locked magnetic islands in a tokamak plasma. These in turn lead usually to a disruption (70-80% disruptivity at JET). 2. Larger machines are more sensible to error fields and locked modes on ITER will be a major problem. 3. The sideband 1/1 and 3/1 fields play a significant role in the penetration of the 2/1 mode5. 4. JET and COMPASS-D, with their error field coils, are in a key position to investigate the physics of these modes and to give useful information for the scaling towards ITER.