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المؤلفون: Xu, L. M., Fan, H.

المصدر: Journal of Applied Physics; 2018, Vol. 124 Issue 22, pN.PAG-N.PAG, 6p, 2 Diagrams, 4 Graphs

مصطلحات موضوعية: WAVELENGTHS, ELASTICITY

مستخلص: In the present study, we examine the surface shear horizontal (SH) wave in a classical linear elastic half-space covered by a surface layer modeled by the couple stress theory [Mindlin and Tiersten, Arch. Ration. Mech. Anal. 11, 415 (1962)]. The boundary conditions on the surface of the half space are translated into the "body" forces in the surface layer according to the surface elasticity proposed by Gurtin and Murdoch [Arch. Ration. Mech. Anal. 57, 291 (1975)]. Combining the surface elasticity and the couple stress theory, we find that the surface SH waves are only available for a limited range of wavelengths due to the presence of the micro-length in the couple stress theory. [ABSTRACT FROM AUTHOR]

: Copyright of Journal of Applied Physics is the property of American Institute of Physics and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

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المؤلفون: Shi, P. W., Yang, Z. C., Shi, Z. B., Xu, L. F., Deng, W. C., Jiang, M., Chen, W., Zhong, W. L., Wen, J., Fang, K. R., Tong, R. H., Xue, G. Q., Yu, X., Li, Y. G., Ji, X. Q., Zhang, Y. P., Yang, Q. W., Xu, M., Wang, Z. X., Duan, X. R.

المصدر: Review of Scientific Instruments; Aug2021, Vol. 92 Issue 8, p1-6, 6p

مصطلحات موضوعية: PHASE-shifting interferometry, TOKAMAKS, FIELD programmable gate arrays, VOLTAGE-controlled oscillators, ELECTRON density, FAST Fourier transforms, PROGRAMMABLE logic devices

مستخلص: A solid state terahertz interferometer has been developed on the recent commissioned HL-2M tokamak. It can work in a wide frequency region of 220–325 GHz, and the terahertz wave is generated from a low frequency phase locked voltage controlled oscillator with the frequency multiplying technique. A phase processor based on field programmable gate array (FPGA) technology is designed for the heterodyne interferometer, and it contributes to real-time display of electron density. To extract phase information, a novel numerical algorithm related to fast Fourier transform is written on the FPGA chip and enables one to obtain phase shift without being affected by amplitude variation induced by plasma absorption or frequency modulation from the outer electromagnetic environment. The interferometer achieves minimum measurable electron density in the order of 10¹⁶ m⁻³. With the plasma diagnosis, electron density and low frequency tearing mode have been measured during the first experimental campaign. [ABSTRACT FROM AUTHOR]

: Copyright of Review of Scientific Instruments is the property of American Institute of Physics and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)