Reference Design of ICRF Antenna for EAST

The full wave TORIC code and the Kinetic Fokker-Planck SSFPQL code are combined to perform self-consistent simulations of the ICRF heating in the EAST 2D magnetic configuration. The combined package is applied to the ICRF hydrogen minority heating in a deuterium plasma with the hydrogen concentration up to 10%. The fast wave propagation and absorption properties, power partitions among the plasma species and the RF driven energetic tails have been analyzed. Meanwhile, in order to optimize the ICRF heating, changing the resonance locations has also been considered in EAST plasmas.

Section: Introductionmentioning

confidence: 98%

Optimization Study of ICRF Hydrogen Minority Heating in a Deuterium Plasma of EAST

Zhang

Fangwei

2015

“…The ICRF system on the EAST [5][6][7] consists of eight transmission lines, each line includes a transmitter [8], liquid stub tuners [9], a decoupler [10,11], and the antenna [12,13] as shown in figure 1. The main diagnostic system in the transmission line includes a directional coupler, the voltage probes array, and the V/I probes array.…”

Section: V/i Probes On East Icrf Systemmentioning

confidence: 99%

Design and test of voltage and current probes for EAST ICRF antenna impedance measurement

Wang

Chen

Zhao

et al. 2018

On the experimental advanced superconducting tokamak (EAST), a pair of voltage and current probes (V/I probes) is installed on the ion cyclotron radio frequency transmission lines to measure the antenna input impedance, and supplement the conventional measurement technique based on voltage probe arrays. The coupling coefficients of V/I probes are sensitive to their sizes and installing locations, thus they should be determined properly to match the measurement range of data acquisition card. The V/I probes are tested in a testing platform at low power with various artificial loads. The testing results show that the deviation of coupling resistance is small for loads R L >2.5 Ω, while the resistance deviations appear large for loads R L <1.5 Ω, which implies that the power loss cannot be neglected at high VSWR. As the factors that give rise to the deviation of coupling resistance calculation, the phase measurement error is the more significant factor leads to deleterious results rather than the amplitude measurement error. To exclude the possible ingredients that may lead to phase measurement error, the phase detector can be calibrated in steady L-mode scenario and then use the calibrated data for calculation under H-mode cases in EAST experiments.

“…With the aim of predicting the potential contours and the electric field distribution of the vacuum feedthrough, an electro-analysis is conducted for the vacuum feedthrough. In order to transmit a certain power to the plasma without breakdown in the feeding coaxial line, with the standard dry air breakdown field of E b = 2.1 MV/m [11] , the maximum allowable voltage of the transmission line is given by [4] V b = 2.42…”

Section: Analysis Of the Vacuum Feedthrough 31 Electro-analysis Of Th...mentioning

confidence: 99%

“…Heating and current drive using the ICRF wave have been proposed in EAST, with its main parameters of R 0 = 1.75 m, a = 0.4 m, κ = 1.6∼1.8, δ = 0.8, B t = 3.5 T, I P = 1 MA and t pulse = 1000 s [4] . The ICRF system in EAST was designed to operate at a flexible frequency in a range of 30 MHz to 110 MHz.…”

Section: Introductionmentioning

confidence: 99%

Design of the Vacuum Feedthrough for the EAST ICRF Antenna

Yang¹,

Song²,

Wu³

et al. 2011

Detailed design of the vacuum feedthrough for the ion cyclotron radio frequency (ICRF) antenna in EAST, along with an electro-analysis and thermal structural analysis, is presented. The electric field, the voltage standing wave ratio (VSWR) and the stresses in the vacuum feedthrough are studied. A method using the rings of oxygen-free copper as the cushion and macrobeam plasma arc welding is applied in the assembly to protect the ceramic from being damaged during welding. The vacuum leak test on the prototype of vacuum feedthrough is introduced.