Počet záznamů: 1  

Characteristics of X-point lobe structures in single-null discharges on MAST

  1. 1. 0434796 - UFP-V 2015 RIV AT eng J - Článek v odborném periodiku
    Harrison, J.R. - Kirk, A. - Chapman, I.T. - Cahyna, Pavel - Liu, Y. - Nardon, E. - Thornton, A.J.
    Characteristics of X-point lobe structures in single-null discharges on MAST.
    Nuclear Fusion. Roč. 54, č. 6 (2014), 064015-064015 ISSN 0029-5515
    Grant CEP: GA ČR GAP205/11/2341
    Institucionální podpora: RVO:61389021
    Klíčová slova: tokamak * MAST * X-point * resonant magnetic perturbation
    Kód oboru RIV: BL - Fyzika plazmatu a výboje v plynech
    Impakt faktor: 3.062, rok: 2014

    Lobe structures due to the application of resonant magnetic perturbations (RMPs) have been observed using wide-angle imaging of light from He1+ ions in the vicinity of the lower X-point in MAST. Above a threshold value the lobe structures extend radially, linearly with the coil current, both in L-mode and H-mode. After the application of the RMP, as the toroidal rotation in the confined plasma decreases, the lobes extend radially. This suggests the plasma is less effectively screening the RMP field. Comparing the imaging data with results from vacuum modelling shows that this technique can accurately predict the number and poloidal location of the lobes, but over-estimates their radial extent. More accurate estimates of the extent of the lobes can be made by accounting for plasma screening of the RMP field. Qualitative agreement between simulation and experiment is found if it is assumed that the RMP penetrates 2% in normalized radius from the last closed flux surface.
    Trvalý link: http://hdl.handle.net/11104/0238795