TY - JOUR
T1 - Scaling of radiated power to plasma contamination for neon seeded discharges on boronized TEXTOR-94
AU - Telesca, G.
AU - Claassen, H. A.
AU - Franz, P.
AU - Messiaen, A. M.
AU - Ongena, J.
AU - Rapp, J.
AU - Samm, U.
AU - Schoon, N.
AU - Schweer, B.
AU - Tokar', M. Z.
AU - Unterberg, B.
AU - Van Oost, G.
PY - 1997/2/2
Y1 - 1997/2/2
N2 - When neon is injected into a tokamak plasma with the aim of reducing the peak heat flow into the SOL by enhanced edge radiation, both Prad and Zeff increase. The ratio of the incremental Prad to the incremental Zeff, ΔPrad/ΔZeff, can change on TEXTOR from 0.1 MW to about 2 MW depending on ne, on Te(a) and on the transport regime. The measured ΔPrad/ΔZeff is higher for I-mode auxiliary heated (higher diffusion) than for OH discharges (lower diffusion), consistent with model calculations. For I-mode discharges ΔPrad/ΔZeff is a decreasing function of Te(a) and it scales approximately as n̄e2. The I-mode regime on TEXTOR, which displays very good energy confinement scaling, can represent, for suitable conditions, a satisfactory compromise between a high τE and not excessive particle confinement.
AB - When neon is injected into a tokamak plasma with the aim of reducing the peak heat flow into the SOL by enhanced edge radiation, both Prad and Zeff increase. The ratio of the incremental Prad to the incremental Zeff, ΔPrad/ΔZeff, can change on TEXTOR from 0.1 MW to about 2 MW depending on ne, on Te(a) and on the transport regime. The measured ΔPrad/ΔZeff is higher for I-mode auxiliary heated (higher diffusion) than for OH discharges (lower diffusion), consistent with model calculations. For I-mode discharges ΔPrad/ΔZeff is a decreasing function of Te(a) and it scales approximately as n̄e2. The I-mode regime on TEXTOR, which displays very good energy confinement scaling, can represent, for suitable conditions, a satisfactory compromise between a high τE and not excessive particle confinement.
KW - Improved confinement mode
KW - Impurity transport
KW - Radiation
KW - TEXTOR-94
UR - http://www.scopus.com/inward/record.url?scp=0031546462&partnerID=8YFLogxK
U2 - 10.1016/S0022-3115(96)00619-8
DO - 10.1016/S0022-3115(96)00619-8
M3 - Conference article
AN - SCOPUS:0031546462
SN - 0022-3115
VL - 241-243
SP - 853
EP - 856
JO - Journal of Nuclear Materials
JF - Journal of Nuclear Materials
ER -