TY - JOUR
T1 - Simulation of the time behaviour of impurities in JET Ar-seeded discharges and its relation with sawtoothing and RF heating
AU - Puiatti, M. E.
AU - Valisa, M.
AU - Mattioli, M.
AU - Bolzonella, T.
AU - Bortolon, A.
AU - Coffey, I.
AU - Dux, R.
AU - Von Hellermann, M.
AU - Monier-Garbet, P.
AU - Nave, M. F.F.
AU - Ongena, J.
N1 - Funding Information:
Partially sponsored by Contract 7901870.04 of the Italian National Research Council.
PY - 2003/12
Y1 - 2003/12
N2 - In JET, Ar seeding has proven to be a successful means to reach quasi-stationary regimes that feature, simultaneously, high density, high confinement and an edge radiation belt without significant contamination of the plasma. A detailed analysis shows that in the presence of centrally deposited ion cyclotron resonance heating (ICRH) Ar transport is modified, in the sense of a reduction of the inward pinch convection. Sawtooth (ST) crashes also hamper the accumulation of Ar in the core, though their contribution is less relevant compared to the effect of the ICRH. The analysis is carried out by means of a one-dimensional impurity transport code, which has been applied to several Ar-seeded discharges. The result about the role of ST crashes is independent of triangularity. In the high triangularity discharges, with continuous D refuelling, the convection of impurities in the core region is typically very small so that ICRH injection itself has little relevance in the control of the Ar behaviour.
AB - In JET, Ar seeding has proven to be a successful means to reach quasi-stationary regimes that feature, simultaneously, high density, high confinement and an edge radiation belt without significant contamination of the plasma. A detailed analysis shows that in the presence of centrally deposited ion cyclotron resonance heating (ICRH) Ar transport is modified, in the sense of a reduction of the inward pinch convection. Sawtooth (ST) crashes also hamper the accumulation of Ar in the core, though their contribution is less relevant compared to the effect of the ICRH. The analysis is carried out by means of a one-dimensional impurity transport code, which has been applied to several Ar-seeded discharges. The result about the role of ST crashes is independent of triangularity. In the high triangularity discharges, with continuous D refuelling, the convection of impurities in the core region is typically very small so that ICRH injection itself has little relevance in the control of the Ar behaviour.
UR - http://www.scopus.com/inward/record.url?scp=0347541239&partnerID=8YFLogxK
U2 - 10.1088/0741-3335/45/12/003
DO - 10.1088/0741-3335/45/12/003
M3 - Article
AN - SCOPUS:0347541239
SN - 0741-3335
VL - 45
SP - 2011
EP - 2024
JO - Plasma Physics and Controlled Fusion
JF - Plasma Physics and Controlled Fusion
IS - 12
ER -