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Studies on electron Bernstein wave heating in CHS and LHD at NIFS
Y. Yoshimura,H. Igami,S. Ferrando-Margalet,K. Nagasaki,S. Kubo,T. Shimozuma,M. Isobe,C. Suzuki,A. Shimizu,T. Akiyama,C. Takahashi,K. Nagaoka,S. Nishimura,T. Minami,K. Matsuoka,S. Okamura,T. Mutoh 한국진공학회 2007 한국진공학회 학술발표회초록집 Vol.16 No.2
Fine Impedance Matching by Use of Liquid Stub Tuners in ICRF Experiment on LHD
kenji Saito,C. Takahashi,H. Takeuchi,J. G. Kwak,J. S. Yoon,M. Yokota,R. Kumazawa,T. Seki,T. Mutoh,Y. P. Zhao 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.III
An impedance-matching system with liquid stub tuners was developed for high-power, long-pulse ICRF injection in LHD. In order to predict the optimum liquid heights, a loading resistance and an effective length were calculated. We used a complex reflection coefficient measured at a directional coupler attached to the outlet of an oscillator. The effective length changed, as well as the loading resistance, when the plasma condition was changed. Moreover, the effective length changed during long-pulse ICRF injection. By using the loading resistance and the effective length, the liquid heights for impedance matching were calculated and the reflected power was reduced in discharges having similar plasma parameters. Application of this method to real-time feedback control for long-pulse discharges is now being prepared.
Breed Discrimination Using DNA Markers Derived from AFLP in Japanese Beef Cattle
Sasazaki, S.,Imada, T.,Mutoh, H.,Yoshizawa, K.,Mannen, H. Asian Australasian Association of Animal Productio 2006 Animal Bioscience Vol.19 No.8
In the meat industry, correct breed information in food labeling is required to assure meat quality. Genetic markers provide corroborating evidence to identify breed. This paper describes the development of DNA markers to discriminate between Japanese Black and F1 (Japanese Black${\times}$Holstein) breeds. The amplified fragment length polymorphism method was employed to detect candidate markers absent in Japanese Black but present in Holstein. The 1,754 primer combinations yielded eleven markers that were converted into single nucleotide polymorphism markers for high-throughput genotyping. The allele frequencies in both breeds were investigated for discrimination ability using PCR-RFLP. The probability of identifying F1 was 0.9168 and probability of misjudgment was 0.0066 using four selected markers. The markers could be useful for discriminating between Japanese Black and F1 and would contribute to the prevention of falsified breed labeling of meat.
Dependency of the Plasma Loading Resistance on the RF Power for KSTAR ICRF Heating
S. J. Wang,김선호,J. G. Kwak,S. K. Kim,H. Kasahara,T. Seki,T. Mutoh 한국물리학회 2010 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.57 No.5
The ion cyclotron range of frequency (ICRF) experiment on the KSTAR tokamak is performed without the interference of ion cyclotron resonances so that only electrons are heated component. Maximum 150% local Te increase is measured by the ECE with PRF ∼ 300 kW of f = 44.2 MHz RF pulse with wide range of plasma parameters. The averaged RL deduced from the ICRF pulses during this campaign shows that RL has an increasing trend as PRF increases in the range of PRF = 70 ∼ 280 kW. If the local electron density, ne, around an antenna is added by Δne due to the near-field ionization of the outgassed neutral particles, fast wave propagation will be enhanced by a modified fast wave cutoff layer. This enhancement can be represented by RL showing its linearity as a function of n1/2 e = (n'e +Δne)1/2. The experimental result of a monotonic increase in RL with PRF will give a qualitative base to support recent activities to achieve a high-power-density ITER ICRF antenna by actively increasing RL with additional gas puffing in the vicinity of the antenna.