Showing 1 - 10 of 93 Journals Results
2021
UKAEA-CCFE-PR(21)03
Shuo Wang Yueqiang Liu Guoliang Xia X. M. Song G. Z. Hao L. Li B. Li N. Zhang G. Q. Dong X. Bai G. Y. Zheng
The resistive wall mode (RWM) control on the HL-2M tokamak is simulated with the MARS-F code [Liu Y Q et al 2000 Phys. Plasmas 7 3681], aiming at quantifying control current and voltage requirements when more realistic issues are taken into account, i.e. the control power saturation and the sensor signal noise. The fluid model predicts a narrow st…
Preprint2021
UKAEA-CCFE-PR(21)02
Guanqi Dong Yueqiang Liu Xi Chen Guangzhou Hao Yi Liu Shuo Wang Neng Zhang Guoliang Xia
In quiescent H-mode (QH-mode) regime, edge harmonic oscillations (EHOs) are believed to provide necessary radial transport to prevent occurrence of large edge localized modes. A systematic modeling study is performed here on the low-n EHOs in a DIII-D QH-mode plasma [Chen et al. 2016 Nucl. Fusion 56 076011], by utilizing the MARS-Q code [Liu et a…
Preprint Purchase2020
UKAEA-CCFE-PR(20)102
Yuling He Yueqiang Liu Xu Yang Guoliang Xia Li Li
Modification of the external tearing index, Δ’ext , by magnetic feedback is analytically investigated, for the purpose of controlling the resistive plasma resistive wall mode (RP-RWM). The matching method is pursued, by deriving expressions for the close-loop Δ’ext and by linking it to the counterpart from the inner layer. Various…
Preprint Published2019
UKAEA-CCFE-PR(20)121
Guoliang Xia Yueqiang Liu L. Li C. J. Ham Z . Wang Shuo Wang
Effects of parallel and poloidal flows, as well as the flow shear, on the resistive wall mode (RWM) instability have been numerically investigated in toroidally rotating plasmas, utilizing a recently updated version of the MARS-F code (Liu Y Q et al 2000 Phys. Plasmas 7 3681). A significant difference between these flow…
Preprint Published2019
UKAEA-CCFE-PR(20)120
T. Long J.S. Allcock L. Nie R. M. Sharples M. Xu R. Ke S. Zhang S. A. Silburn J. Howard B. Yuan Y. Yu Z.H. Wang X.M. Song L. Liu
A Doppler coherence imaging spectroscopy diagnostic has been developed on the HL- 2A tokamak for scrape-off-layer impurity plasma flow measurements. Two- dimensional imaging of line-averaged C2+ flow in the high-field-side scrape off layer with time resolution up to 1 ms, has been achieved successfully by this system. The spatial angular resolut…
Preprint Published2019
UKAEA-CCFE-PR(20)05
N. Zhang Y. Q. Liu P. Piovesan V. Igochine D. L. Yu S. Wang G. Q. Dong G. Z. Hao G. L. Xia W. J. Chen L. Liu J. Q. Li X. Bai
Resistive plasma response to the n = 1 (n is the toroidal mode number) RMP field is systematically investigated for a high-beta hybrid discharge on ASDEX Upgrade. Both linear and quasi-linear response are modelled using the MARS-F and MARS-Q codes, respectively. Linear response computations show a large internal kink response when the plasma ce…
Preprint Purchase2019
UKAEA-CCFE-PR(19)71
Lei Tang Kun Yan Biao Cai Yiqiang Wang Bin Liud Saurabh Kabrae Moataz M Attallaha Yong Liu
Deformation mechanisms of high entropy alloys (HEAs) at cryogenic temperatures have attracted extensive research interest. We used in situ neutron diffraction to study the tensile behavior of a face-centered-cubic HEA at 77 and 15 K and compared its stacking fault energy (SFE) at ambient and cryogenic temperatures. The SFE dropped from 28…
Preprint Purchase2019
UKAEA-CCFE-PR(19)18
D A Ryan M Dunne A Kirk S Saarelma W Suttrop C Ham Y Q Liu M Willensdorfer the ASDEX Upgrade team the MST1 team
A numerical survey of the plasma response in ASDEX Upgrade ELM control experiments is conducted, to clarify the role of triangularity in the suppression mechanism. The pedestal pressure increases with triangularity consistent with previous work [2], which modestly boosts the peeling response. However, the peeling response decreases with increasi…
Preprint Published2018
UKAEA-CCFE-PR(18)61