Results 191 to 200 of about 2,720 (204)

Development of an electron cyclotron resonance heating and electron Bernstein wave current drive system on ST40

Plasma Physics and Controlled Fusion, 2022
Abstract A mutli-frequency electron cyclotron resonance heating and current drive system is currently under construction at the ST40 spherical tokamak. The system employs two gyrotrons with a maximum output power of 1 MW each. Both gyrotrons can be tuned to operate at either 105 GHz or 140 GHz.
E J du Toit, V F Shevchenko
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Design and commissioning of resistive foil bolometer diagnostics on the ST40 tokamak

Review of Scientific Instruments
Following successful campaigns on the compact high field spherical tokamak ST40, resistive gold foil bolometers have now been installed to measure the radiated power profile. Positioned on the midplane, two bolometer cameras offer perspectives of the horizontal and vertical planes, while the third camera, situated above the midplane, provides a ...
D. M. Harryman, C. Colgan, J. Lovell, M. Moscheni, G. Naylor, A. Rengle, M. Sertoli, A. Sladkomedova, R. Thwaites   +8 more
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On the design and role of passive stabilisation within the ST40 spherical tokamak

Plasma Physics and Controlled Fusion, 2018
The position of passive stabilisation has been optimised for the low aspect ratio tokamak ST40. We find that passive stabilisation is most effective when conductors are placed near the plasma's x-point, and the combined effect of having both inboard and outboard passive stabilisation significantly reduces the vertical instability growth rate.
P F Buxton, O Asunta, M P Gryaznevich, D Lockley, S McNamara, S Medvedev, E Ruiz de Villa Valdés, G Whitfield, J M Wood   +8 more
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Soft x-ray tomography on the high field spherical tokamak ST40

Review of Scientific Instruments
As part of its roadmap to developing commercial fusion plants, Tokamak Energy Ltd. operates the high field spherical tokamak ST40. Studies on this device will help to expand the high field spherical tokamak physics basis by characterizing confinement and the fusion triple product.
C. Colgan, H. Bohlin, P. F. Buxton, D. M. Harryman, O. Jones, H. F. Lowe, G. Naylor, T. O’Gorman, T. Pyragius, M. Sertoli, A. Sladkomedova, S. Sridhar, R. Thwaites   +12 more
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Preparing for First Diverted Plasma Operation in the ST40 High-Field Spherical Tokamak [PDF]

, 2021
The ST40 tokamak [1], built and operated by Tokamak Energy, has recently been upgraded with upper and lower divertors to enable double null diverted operations with up to 1MA of plasma current and 2MW of neutral beam heating. ST40 is a high field spherical tokamak (BT=3T at R0=0.4m) with a goal to extend the high field spherical tokamak physics basis ...
Romanelli M, McNamara S, Buxton P, Asunta O, Varje J, Wood J, Marsden C, Bland J, Nemytov V, Thomas P, Gryaznevich M, Sertoli M, Vincent B, Sridhar S, Dnestrovsky A, Medvedev S, Drozdov V, Rubino G, Innocente P, Calabro' G, Scarpari M, Fanelli P, Giorgetti F, Lombroni R, Kaye S, Diallo A, Guttenfelder W, Barnes M, Zhang Y   +28 more
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Joint testing of the 3 Tesla ST40 spherical tokamak toroidal field coil test assembly

Fusion Engineering and Design, 2017
Abstract Spherical Tokamaks used in magnetic fusion have a small centre-stack by design which causes a higher field on the conductor. ST40 [1] is a 3 Tesla spherical tokamak with a major radius of R  = 40 cm and minor radius of a  = 26 cm being built by Tokamak Energy Ltd. The high toroidal field (TF) requirement requires a wire current of 250 kA
B.K. Huang, M. Mason, A. McFarland, P. Noonan, J.S.H. Ross, A. Sykes   +5 more
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Measurement of divertor surface heat flux by infra-red thermographic inversion in ST40

Review of Scientific Instruments
Diagnostic tools for understanding the edge plasma behavior in fusion devices are essential. The main focus of the present work is to present the infra-red (IR) diagnostics installed on Tokamak Energy’s spherical tokamak (ST40) and the IR thermographic inversion tool, Functional Analysis of Heat Flux (FAHF).
M. Moscheni, E. Maartensson, M. Robinson, C. Marsden, A. Rengle, A. Scarabosio, P. Bunting, T. K. Gray, S. Janhunen, E. Vekshina, X. Zhang   +10 more
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Integrated modeling of ST40 hot ion plasmas using the TGLF transport model

Plasma Physics and Controlled Fusion
Abstract In this paper, the turbulent transport properties of ST40 hot ion plasmas are examined and fully predictive time evolving modeling of a hot ion plasma pulse was performed. Understanding turbulent transport on spherical tokamaks (STs) is challenging due to their unique geometry characteristics.
M S Anastopoulos Tzanis, M R Hardman, Y Zhang, X Zhang, A Sladkomedova, A Dnestrovskii, Y S Na, J H Lee, S J Park, T O’Gorman, H Lowe, M Romanelli, M Sertoli, M Gemmel, J Woods, H V Willett   +15 more
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Biological Shielding and Neutronics for the ST40 Tokamak

ICRS 14/RPSD 2022, 2022
J.O. Astbury, C. Wilson
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Neutronics simulations of ST40 tokamak operations for activation foils in DD plasma operation

Journal of Instrumentation
Abstract Accurate neutron yield provides critical information on plasma performance in tokamaks. Additionally, these measurements are essential for radiation protection activities and shielding verification. This paper discusses the neutron transport simulations and presents a method for measuring the deuterium-deuterium neutron
M. Rajput, G. Kamal, S.R. Mirfayzi, K. Chandrasekhar, M.V. Iliasova, G. Naylor, C. Wilson   +6 more
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