Recent ion cyclotron resonance frequency（ICRF） coupling experiments for optimizing ICRF heating in high power discharge were performed on EAST. The coupling experiments were focus on antenna phasing and gas puffing,...Recent ion cyclotron resonance frequency（ICRF） coupling experiments for optimizing ICRF heating in high power discharge were performed on EAST. The coupling experiments were focus on antenna phasing and gas puffing, which were performed separately on two ports of the ion cyclotron resonance heating（ICRH） system of EAST. The antenna phasing was performed on the I-port antenna, which consists of four toroidally spaced radiating straps operating in multiple phasing cases; the coupling performance was better under low wave number ∣k;∣（ranging from 4.5 to 6.5）. By fuelling the plasma from gas injectors, placed as uniformly spaced array from top to bottom at each side limiter of the B-port antenna, which works in dipole phasing, the coupling resistance of the B-port antenna increased obviously.Furthermore, the coupling resistance of the I-port antenna was insensitive to a smaller rate of gas puffing but when the gas injection rate was more than a certain value(>1021 s;), a sharp increase in the coupling resistance of the I-port antenna occurred, which was mainly caused by the toroidal asymmetric boundary density arising from gas puffing. A more specific analysis is given in the paper.展开更多
Courtroom discourse is a typical institutional discourse, which reflects the complicated discourse purpose among the participants in courtroom, with several characteristics such as: asymmetry of power relation, comple...Courtroom discourse is a typical institutional discourse, which reflects the complicated discourse purpose among the participants in courtroom, with several characteristics such as: asymmetry of power relation, complex directions of communication and complex meaning of utterance. Although courtroom discourse is restricted by special procedures or rules, it is still under the control of the cooperative principle and politeness principle. In order to achieve goals, the participants are bound to obey or violate the cooperative principle and politeness principle. This paper is based on the pragmatic theory, switching trial audio into words, trying to find out the purposes why the participants are liable to flout cooperative principle and use politeness and impoliteness strategies, in order to further explore the discourse power in courtroom. This essay not only broaden the perspective of pragmatic research, but reveal the communicative goal in terms of power relation. It will conducive to grasp the interaction conversation, so as to guarantee the fairness of court trial.展开更多
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,...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 RL?>?2.5 Ω, while the resistance deviations appear large for loads RL?<?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.展开更多
基金National key Research and Development program (Grant Nos. 2016YFA0400600 and 2016YFA0400601)National Magnetic Confinement Fusion Science Programme (Grant Nos. 2015GB101001 and 2013GB106001B)+1 种基金National Natural Science Foundation of China under Grant Nos. 11375235, 11675213 and 11375236JSPS-NRF-NSFC A3 Foresight Program in the field of Plasma Physics (NSFC no. 11261140328)
文摘Recent ion cyclotron resonance frequency（ICRF） coupling experiments for optimizing ICRF heating in high power discharge were performed on EAST. The coupling experiments were focus on antenna phasing and gas puffing, which were performed separately on two ports of the ion cyclotron resonance heating（ICRH） system of EAST. The antenna phasing was performed on the I-port antenna, which consists of four toroidally spaced radiating straps operating in multiple phasing cases; the coupling performance was better under low wave number ∣k;∣（ranging from 4.5 to 6.5）. By fuelling the plasma from gas injectors, placed as uniformly spaced array from top to bottom at each side limiter of the B-port antenna, which works in dipole phasing, the coupling resistance of the B-port antenna increased obviously.Furthermore, the coupling resistance of the I-port antenna was insensitive to a smaller rate of gas puffing but when the gas injection rate was more than a certain value(>1021 s;), a sharp increase in the coupling resistance of the I-port antenna occurred, which was mainly caused by the toroidal asymmetric boundary density arising from gas puffing. A more specific analysis is given in the paper.
文摘Courtroom discourse is a typical institutional discourse, which reflects the complicated discourse purpose among the participants in courtroom, with several characteristics such as: asymmetry of power relation, complex directions of communication and complex meaning of utterance. Although courtroom discourse is restricted by special procedures or rules, it is still under the control of the cooperative principle and politeness principle. In order to achieve goals, the participants are bound to obey or violate the cooperative principle and politeness principle. This paper is based on the pragmatic theory, switching trial audio into words, trying to find out the purposes why the participants are liable to flout cooperative principle and use politeness and impoliteness strategies, in order to further explore the discourse power in courtroom. This essay not only broaden the perspective of pragmatic research, but reveal the communicative goal in terms of power relation. It will conducive to grasp the interaction conversation, so as to guarantee the fairness of court trial.
基金National Natural Science Foundation of China under grant Nos. 11575237, 11775258, 11675213, 11375235 and 11375236National key research and development program (grant Nos. 2016YFA0400600 and 2016YFA0400601)+2 种基金International Scientific and Technological Cooperation Project of Anhui (grant No. 1704e1002207)the National Magnetic Confinement Fusion Science Programme of China (grant Nos. 2015GB101001 and 2013GB106001B)JSPSNRF-NSFC A3 Foresight Program in the field of Plasma Physics (NSFC No. 11261140328)
文摘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 RL?>?2.5 Ω, while the resistance deviations appear large for loads RL?<?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.
