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pro vyhledávání: '"Hall-Chen, Valerian H."'
Autor:
Speirs, David C., Ruiz-Ruiz, Juan, Giacomin, Maurizio, Hall-Chen, Valerian H., Phelps, Alan D. R., Vann, Roddy, Huggard, Peter G., Wang, Hui, Field, Anthony, Ronald, Kevin
Plasma turbulence on disparate spatial and temporal scales plays a key role in defining the level of confinement achievable in tokamaks, with the development of reduced numerical models for cross-scale turbulence effects informed by experimental meas
Externí odkaz:
http://arxiv.org/abs/2408.15807
Autor:
Ruiz, Juan Ruiz, Parra, Felix I., Hall-Chen, Valerian H., Belrhali, Nathan, Giroud, Carine, Hillesheim, Jon C., Lopez, Nicolas A., contributors, JET
The phenomenon of beam focusing of microwaves in a plasma near a turning-point caustic is discussed in the context of the analytical solution to the Gaussian beam-tracing equations in the 2D linear-layer problem. The location of maximum beam focusing
Externí odkaz:
http://arxiv.org/abs/2408.12919
Autor:
Ruiz, Juan Ruiz, Garcia, Jeronimo, Barnes, Michael, Dreval, Mykola, Giroud, Carine, Hall-Chen, Valerian H., Hardman, Michael R., Hillesheim, Jon C., Kazakov, Yevgen, Mazzi, Samuele, Parra, Felix I., Patel, Bhavin S., Schekochihin, Alexander A., Stancar, Ziga, Contributors, the JET, Team, the EUROfusion Tokamak Exploitation
We report the first experimental detection of a zero-frequency fluctuation that is pumped by an Alfv\'en mode in a magnetically confined plasma. Core-localized bidirectional Alfv\'en modes of frequency inside the toroidicity-induced gap (and its harm
Externí odkaz:
http://arxiv.org/abs/2407.01255
Autor:
Hall-Chen, Valerian H., Parra, Felix I., Hillesheim, Jon C., Ruiz, Juan Ruiz, Crocker, Neal A., Shi, Peng, Chu, Hong Son, Freethy, Simon J., Kogan, Lucy A., Peebles, William A., Pratt, Quinn T., Rhodes, Terry L., Ronald, Kevin, Scannell, Rory, Speirs, David C., Storment, Stephen, Trisno, Jonathan
The Doppler backscattering (DBS) diagnostic, also referred to as Doppler reflectometry, measures turbulent density fluctuations of intermediate length scales. However, when the beam's wavevector is not properly aligned perpendicular to the magnetic f
Externí odkaz:
http://arxiv.org/abs/2211.17141
Autor:
Hall-Chen, Valerian H., Damba, Julius, Parra, Felix I., Pratt, Quinn T., Michael, Clive A., Peng, Shi, Rhodes, Terry L., Crocker, Neal A., Hillesheim, Jon C., Hong, Rongjie, Ni, Shikang, Peebles, William A., Png, Ching Eng, Ruiz, Juan Ruiz
We use the beam model of Doppler backscattering (DBS), which was previously derived from beam tracing and the reciprocity theorem, to shed light on mismatch attenuation. This attenuation of the backscattered signal occurs when the wavevector of the p
Externí odkaz:
http://arxiv.org/abs/2209.15303
Publikováno v:
Plasma Physics and Controlled Fusion 64, 095002 (2022)
We use beam tracing -- implemented with a newly-written code, Scotty -- and the reciprocity theorem to derive a model for the linear backscattered power of the Doppler Backscattering (DBS) diagnostic. Our model works for both the O-mode and X-mode in
Externí odkaz:
http://arxiv.org/abs/2109.10973
Autor:
Liu, Yejing, Wang, Hao, Ho, Jinfa, Ng, Ryan C., Ng, Ray J. H., Hall-Chen, Valerian H., Koay, Eleen H. H., Dong, Zhaogang, Liu, Hailong, Qiu, Cheng-Wei, Greer, Julia R., Yang, Joel K. W.
The rings, spots and stripes found on some butterflies, Pachyrhynchus weevils, and many chameleons are notable examples of natural organisms employing photonic crystals to produce colorful patterns. Despite advances in nanotechnology, we still lack t
Externí odkaz:
http://arxiv.org/abs/1905.05913
Akademický článek
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Autor:
Liu, Yejing, Wang, Hao, Ho, Jinfa, Ng, Ryan C., Ng, Ray J. H., Hall-Chen, Valerian H., Koay, Eleen H. H., Dong, Zhaogang, Liu, Hailong, Qiu, Cheng-Wei, Greer, Julia R., Yang, Joel K. W.
Publikováno v:
Nature Communications; 9/25/2019, Vol. 10 Issue 1, pN.PAG-N.PAG, 1p