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《核工业西南物理研究院年报(英文版)》2006,(1):12-14
The development of eight new diagnostic systems and the improvement of the laser Thomson scattering system contributed to the experimental campaign on HL-2A in 2006. Besides, the accuracy and flexibility of the molecular beam injection (MBI) system was improved greatly by using the special driver and controller, it is more convenient for studies such as particle transport. In the field of plasma physics experiment, the features of 3-D GAM zonal flows were further studied and some signs of low frequency zonal flows were observed. In the ECRH experiments, the effects of ECRH on sawtooth activities and m/n= 1/1 mode were studied under different plasma discharge conditions. The effect of MBI during ECRH on plasma behavior, such as non-local heat transport, was also studied. 相似文献
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H. Ackermann 《Hyperfine Interactions》1978,4(1-2):645-665
The general features of hyperfine interaction measurements using neutron-activated emitters are described and the applications of this technique are reviewed: nuclear magnetic resonance and transients of the nuclear polarization give informations on nuclear moments, interactions in undisturbed lattices, radiation induced and thermal defects in insulators and metals.Most of the experiments reported here were performed at the High Flux Reactor Grenoble and at the FR 2 reactor Karlsruhe in collaboration with K. Dörr, D. Dubbers, F. Fujara, H. Grupp, M. Grupp, P. Heitjans, A. Koerblein, P. von Blanckenhagen, H.-J. Stoeckmann and A. Winnacker. 相似文献
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H. R. Rechenberg 《Hyperfine Interactions》1990,54(1-4):683-687
Mössbauer spectra of Fe1?x Ni x withx=0.40, 0.35 and 0.32 were taken at various temperatures and fitted withB hf distributions. TheP(B hf) curves generally show a peak and a low-field tail. The peakB * and the average \(\bar B\) were obtained in theT→0 limit. Fe moments were deduced from these data with help of a semiempirical equation. While the average \(\bar \mu _{Fe} \) decreases withx (invar anomaly), a large fraction of Fe atoms retain the strong moment (≈ 2.7 μB) typical of Ni-rich alloys. This result is consistent with a two-states model for invar. 相似文献
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F. D. Saccone C. E. Rodríguez Torres F. H. Sánchez M. B. Fernández van Raap 《Hyperfine Interactions》2001,134(1):123-129
RE2Fe14B (RE=rare earth) materials are capable of absorbing hydrogen to form a stable solid solution at room temperature. Hydrogenation produces a number of significant changes in the hyperfine interactions. In this work, 57Fe Mössbauer effect spectroscopy and X-ray diffraction measurements were performed on Nd14.01Hf0.08Fe78.91B7.00 alloys submitted to thermal treatment in hydrogen atmosphere. A non-linear increase of the hyperfine fields and isomer shifts with hydrogen concentration was observed. The hyperfine parameters of the 8j1 site exhibit a rather different evolution than those experienced by the other major sites (8j2, 16k1, 16k2). The origin of the hyperfine field enhancement is analyzed in terms of volume expansion and H nearest neighbors to the Fe sites. A linear expression on these two effects to give account of isomer shift evolution for 8j1 site is given. 相似文献