UKAEA Journals

Showing 1 - 10 of 10 Journals Results
2021
UKAEA-CCFE-PR(21)39

A recently updated version of the MARS-F code [Y. Q. Liu et al. Phys. Plasmas 7, 3681 (2000); L. Li et al. Phys. Plasmas 25, 082512 (2018); G. L. Xia et al. Nucl. Fusion 59, 126035 (2019)] is utilized to numerically investigate the plasma screening effect on the applied resonant magnetic perturbation (RMP) field, assuming various equilibrium flo…

Preprint Published
2021
UKAEA-RACE-PR(21)02

This article presents and practically validates an identifier-critic-based approximate dynamic programming (ADP) method to online address the optimal tracking control problem for nonlinear continuous-time unknown systems. The imposed assumption on precisely known system dynamics is obviated via a neural network (NN) identifier. A static contro…

Preprint Purchase
2021
UKAEA-CCFE-PR(21)03

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…

Preprint Purchase
The published version of this paper is currently under embargo and will be available on 16/04/2022
2021
UKAEA-CCFE-PR(21)02

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 Purchase
The published version of this paper is currently under embargo and will be available on 22/03/2022
2020
UKAEA-CCFE-PR(20)126

Martensitic stainless steels have been widely used in industries due to their high strength and good corrosion resistance performance. Precipitation-hardened (PH) martensitic stainless steels are featured by their very high strength compared with other stainless steels, around 3-4 times of the strength of austenitic stainless steels such as 304 and…

Published
2019
UKAEA-CCFE-PR(20)120

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 Published
2019
UKAEA-CCFE-PR(20)05

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 centra…

Preprint Published
2019
UKAEA-CCFE-PR(19)27

This report covers the initial progress on the development of material property handbook (MPH) of baseline CuCrZr, within the Materials Engineering Data and Design Integration (MAT-EDDI) of EUROfusion Material Database and Handbook group. Initial drafting of the baseline CuCrZr MPH structure is presented, with inclusion of available data, figures a…

Preprint Published
2018
UKAEA-CCFE-PR(18)61

Effects of toroidal plasma flow, magnetic drift kinetic damping as well as feedback control, on the resistive wall mode instability in HL-2M tokamak are numerically investigated, using the linear stability codes MARS-F/K (Liu Y Q et al 2000 Phys. Plasmas 7 3681, Liu Y Q et al 2008 Phys. Plasmas 15…

Preprint Published
2018
UKAEA-CCFE-PR(18)55

A long-term high-temperature testing stress rig has been designed and fabricated for performing in situ neutron diffraction tests at the ENGIN-X beamline, ISIS facility in the UK. It is capable of subjecting metals to high temperatures up to 800°C and uniaxial loading under different boundary conditions including constant load, constant s…

Preprint Published