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UKAEA-CCFE-PR(25)2932023
This paper reports on the refinement (building on Ref. [1]) and application of simple formulas for electron heat transport from electron temperature gradient (ETG) driven turbulence in the pedestal. The formulas are improved by (1) improving the parameterization for certain key parameters and (2) carefully accounting for the impact of geometry a…
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UKAEA-CCFE-CP(25)082023
JET, the world’s largest tokamak with unique ITER-like Be/W wall and tritium handling capability had completed its second Deuterium-Tritium (DT) campaign in 2021 following a decade of preparatory experiments, technical rehearsals and training, dedicated enhancements. Operation with tritium raises significant technical, safety and scientific ch…
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UKAEA-CCFE-PR(25)2922023
A new Doppler backscattering (DBS) system, consisting of Q-band and V-band, has been installed and achieved its first data on the MAST-U spherical tokamak. The Q-band and V-band have separate microwave source systems, but share the same optical front-end components. The Q-band and V-band sources simultaneously generate eight (34, 36, 38, 40, 42,…
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UKAEA-CCFE-PR(25)2912023
We compare the structure of electron temperature gradient (ETG) driven turbulence in the pedestals of two JET ITER-like-wall (ILW) type I ELMy H-mode discharges operating with similar experimental inputs but at different levels of gas fuelling. By artificially removing the toroidal drifts from our GENE gyrokinetic simulations and subsequently an…
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UKAEA-CCFE-CP(25)072023
The EU-DEMO first wall protection strategy relies on limiter components to face both normal and off-normal plasma transient events. The heat loads during these events are likely to damage the breeding blanket first wall otherwise. Since tungsten is the preferred plasma-facing material for EU-DEMO, the plasma-facing component design of the limite…
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UKAEA-CCFE-CP(25)062023
The EU-DEMO baseline design for the vacuum vessel (VV) currently provides for 48 openings – the so-called VV ports. These are foreseen to accommodate port plugs containing components, such as front ends for diagnostics and heating systems, first wall protection limiters and the first stages of the VV vacuum system. During the operation …
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UKAEA-CCFE-CP(25)042023
2021 has culminated with the completion of the JET-ILW DTE2 experimental campaign. This contribution summarizes Ion Cyclotron Resonance Heating (ICRH) operations from system and physics point of view. Improvements to the (ICRH) system, to operation procedures and to real time RF power control were implemented to address specific constraints from…
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UKAEA-CCFE-PR(25)2832022
Starting from the equations of collisionless linear gyrokinetics for magnetised plasmas with an imposed inhomogeneous magnetic field, we present the first known analytical, closed-form solution for the resulting velocity-space integrals in the presence of resonances due to both parallel streaming and low-beta magnetic drifts. These integrals are…
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UKAEA-CCFE-CP(25)032022
The UK Spherical Tokamak for Energy Production (STEP) program is currently progressing the conceptual engineering design of a Spherical Tokamak-based fusion reactor. The program includes a project concerned with design of the reactor breeding blanket. The objective of this work was to develop a low fidelity, integrated simulation approach to sup…
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UKAEA-CCFE-PR(25)3102025
An optical interlock protects the JET neutral beam ducts from damage if there is a fast pressure rise in the beam duct. The ability to trip during fault conditions and avoidance of false trips is limited by background light from the plasma and the additional light from radiation effects. A false trip occurred during the JET-DTE2 experimental cam…
Showing 181 - 190 of 2527 UKAEA Paper Results