Impurity reduction and remote radiative cooling with single-null poloidal divertor in Doublet-III

Abstract

The successful operation of a single-null poloidal divertor in Doublet-Ill has demonstrated several new advantages of a diverted tokamak in addition to the suppression of impurity influx as demonstrated in DIVA: 1) The impurity contamination and radiation loss of the main plasma has been reduced by an open divertor geometry, i.e. without a divertor chamber; 2) The radiative cooling and formation of a dense and cold (n e >5Xl0 13 crn~3, T e <7 eV, P H , < 4 X 10' 3 torr) divertor plasma have been observed. -Up to 50% of the Ohmic input power is radiated in the divertor region, thus cooling the plasma in front of the divertor plate down to several eV. This remote radiative cooling greatly reduces the heat load on the divertor plate without cooling the main plasma. -The feasibility of remote radiative cooling in INTOR was studied by use of a volume integration technique of the radiation power along the field line.

Multi-faceted asymmetric radiation from the edge formation in DIII-D high-confinement mode discharges with continuous gas puffing

“…IV E. The impurity radiation power loss rate in the divertor (⌬Q rad ) is calculated with a well-known model 17,18 assuming coronal equilibrium and using the ADPAK data. 14 ⌬N at is the net ionization rate calculated by the neutral model, as described in Sec.…”

An Implicit Monte Carlo Method for Simulation of Impurity Transport in Divertor Plasma

“…r k values. Previously, Shimada et al [8] already proposed such a simple noncoronal model of the same form as Eq.…”

“…We compare these results with those obtained from a simple noncoronal nation. We have to choose the sufficiently small time step in which the ion cannot suffer multiple ionizations/recom-model proposed by Shimada et al [8].…”

Resist Thinning Effect on Nanometer-Scale Line-Edge Roughness

“…Strong radiative cooling in the divertor has been demonstrated in the single-null divertor of Dili [11,12]. This radiative cooling is called remote radiative cooling, since it mainly cools the divertor plasma and does not directly cool the main plasma.…”