A.N. Petrov S. Wray K. Zarebski T. Stroud J. Acres T. Owoeye M. Cannon F. Christie T. Jackson V. Laksharam S. Stewart R. Griffiths N. Brewer K. Rochford S. Gribben
The work presented in this paper is an integrated time-dependent model, describing the power demands of the major tokamak components (magnets, cryogenics, heating and current drive, etc.), as well as the power generated. The physics are implemented in OpenModelica and make use of a Python API (Application Programming Interface) to collect inputs, r…
PreprintChr. Day K. Battes B. Butler S.Davies L. Farina A. Frattolillo R. George T. Giegericha S. Hanke T. Härtl Y. Igitkhanov T. Jackson N. Jayasekera Y. Kathage P.T. Lang R. Lawless X. Luo C. Neugebauer B. Ploeckl A. Santucci J. Schwenzer T. Teichmann T. Tijssen S. Tosti S. Varoutis A. Vazquez Cortes
In the Pre-Concept Design Phase of EU DEMO, the work package TFV (Tritium – Matter Injection – Vacuum) has developed a smart and tritium self-sufficient three-loop fuel cycle architecture. Driven by the need to reduce the tritium inventory in the systems to an absolute minimum, this requires the continual recirculation of gases in loops without…
Preprint PurchaseJ. Keep T. Berry S. Budden B. Chuilon B. Colling E. Flynn S. Ha C. Jackson G. Keech W. Leong G. Mathew E. Organ C. Shaw A. Wilde
DEMO is a key part of the EU fusion roadmap, and the programme reaches the end of the pre-conceptual phase with a gate review in 2020. As part of the work to complete this phase, eight Key Design Integration Issues (KDII’s) have been identified as critical to the programme. Two of these KDII’s identified a requirement for a more detailed archit…
Preprint PublishedA. R. Jackson A. S. Jacobsen K. G. McClements C. A. Michael M. Cecconello
The efficient confinement of fast ions is crucial to the development of a fusion power plant. Sawtooth crashes are a manifestation of an internal kink instability, which can severely degrade this confinement. The effect of these on a fast ion population can be investigated using fast-ion deuterium-alpha (FIDA) spectroscopy, where charge exchange…
Preprint PublishedM.L. Jackson P.C.M. Fossati R.W. Grimes
Atomic scale molecular dynamics simulations of radiation damage have been performed on beryllium. Direct threshold displacement simulations along a geodesic projection of directions were used to investigate the directional dependence with a high spatial resolution. It was found that the directionally averaged probability of displacement increases f…
PublishedM.L. Jackson P.A. Burr R.W. Grimes
There has been considerable controversy regarding the structure of TiBe12, which is variously reported as hexagonal and tetragonal. Lattice dynamics simulations based on density functional theory show the tetragonal phase space group I4/mmm to be more stable over all temperatures, while the hexagonal phase exhibits an imaginary phonon mode, which, …
Preprint PublishedI.T. Chapman R.J. La Haye R.J. Buttery W.W. Heidbrink G.L. Jackson C.M. Muscatello C.C. Petty R.I. Pinsker B.J. Tobias F. Turco
Sawtooth control using electron cyclotron current drive (ECCD) has been demonstrated in ITER-like plasmas with a large fast ion fraction, wide q = 1 radius and long uncontrolled sawtooth period in DIII-D. The sawtooth period is minimized when the ECCD resonance is just inside the q = 1 surface. Sawtooth destabilization using driven current inside q…
PublishedM. Okabayashi G. Matsunaga J.S. Degrassie W.W. Heidbrink Y. In Y.Q. Liu H. Reimerdes W.M. Solomon E.J. Strait M. Takechi N. Asakura R.V. Budny G.L. Jackson J.M. Hanson R. J. La Haye M.J. Lanctot J. Manickam K. Shinohara Y.B. Zhu
An energetic-particle (EP)-driven “off-axis-fishbone-like mode (OFM)” often triggers a resistive wall mode (RWM) in JT-60U and DIII-D devices, preventing long-duration high-b N discharges. In these experiments, the EPs are energetic ions (70–85 keV) injected by neutral beams to produce high-pressure plasmas. EP-driven bursting events reduce t…
PublishedM.J. Lanctot H. Reimerdes A.M. Garofalo M.S. Chu J. M. Hanson Y.Q. Liu G.A. Navratil I.N. Bogatu Y. In G.L. Jackson R.J. La Haye M. Okayabashi J.-K. Park M.J. Schaffer O. Schmitz E.J. Strait A.D. Turnbull
A detailed experiment-theory comparison reveals that linear ideal MHD theory is in quantitative agreement with external magnetic and internal soft x-ray measurements of the plasma response to externally applied non-axisymmetric fields over a broad range of beta and rotation. This result represents a significant step toward the goal of advancing the…
PublishedYueqiang Liu M.S. Chu W.F. Guo F. Villone R. Albanese G. Ambrosino M. Baruzzo T. Bolzonella I.T. Chapman A.M. Garofalo C.G. Gimblett R.J. Hastie T.C. Hender G.L. Jackson R.J. La Haye M.J. Lanctot Y.K. In G. Machiori M. Okabayashi R. Pac
Two issues of the resistive wall mode (RWM) control code maturity are addressed: the inclusion of advanced mode damping physics beyond the ideal MHD description, and the possibility of taking into account the influence of 3D features of the conducting structures on the mode stability and control. Examples of formulations and computational results a…
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