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- Abel, I, et al.
(författare)
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Overview of the JET results with the ITER-like wall
- 2013
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Ingår i: Nuclear Fusion. - : IOP Publishing. - 1741-4326 .- 0029-5515. ; 53:10, s. 104002-
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Tidskriftsartikel (refereegranskat)abstract
- Following the completion in May 2011 of the shutdown for the installation of the beryllium wall and the tungsten divertor, the first set of JET campaigns have addressed the investigation of the retention properties and the development of operational scenarios with the new plasma-facing materials. The large reduction in the carbon content (more than a factor ten) led to a much lower Z(eff) (1.2-1.4) during L- and H-mode plasmas, and radiation during the burn-through phase of the plasma initiation with the consequence that breakdown failures are almost absent. Gas balance experiments have shown that the fuel retention rate with the new wall is substantially reduced with respect to the C wall. The re-establishment of the baseline H-mode and hybrid scenarios compatible with the new wall has required an optimization of the control of metallic impurity sources and heat loads. Stable type-I ELMy H-mode regimes with H-98,H-y2 close to 1 and beta(N) similar to 1.6 have been achieved using gas injection. ELM frequency is a key factor for the control of the metallic impurity accumulation. Pedestal temperatures tend to be lower with the new wall, leading to reduced confinement, but nitrogen seeding restores high pedestal temperatures and confinement. Compared with the carbon wall, major disruptions with the new wall show a lower radiated power and a slower current quench. The higher heat loads on Be wall plasma-facing components due to lower radiation made the routine use of massive gas injection for disruption mitigation essential.
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- Adinoyi, Abdulkareem, et al.
(författare)
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EU FP6 IST-2003-507581 WINNER, D3.1 Description of identified new relay based radio network deployment, Oct 2004
- 2004
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- In D3.1 the first concept for a WINNER radio network deployment mainly focused on relay basedconcepts are proposed. Further the concept of an radio and protocol architecture is presented that takes upthe relaying approach as well as the idea of having different WINNER radio interface modes to servedifferent user and usage scenarios in an optimal manner. Thereby the presented protocol concept is basedon generic and mode specific user an control plane functionalities, where the common functions fordifferent modes are generalised and provide a common interface towards upper layer functions/protocols.Further some relaying concepts for urban hot area coverage including mesh networks are presentedaccompanied by promising simulation results. In addition to the relaying concepts benchmarks have beenproduced to allow a comparison of new concepts against today’s systems.
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- Adinoyi, Abdulkareem, et al.
(författare)
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EU FP6 IST-2003-507581 WINNER, D3.2 Description of identified new relay based radio network deployment
- 2005
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- Following the WINNER vision of a ubiquitous radio system providing wireless access for a wide range ofservices and applications across all environments D3.2 has consequently continued the work of D3.1towards a WINNER deployment concept. To cover the requirements of a WINNER RAN the flexiblenode architecture has been further elaborated. The envisaged WINNER modes are taken into account bymulti-mode protocol architecture that allows to exploit commonalities between different modes leading toa very flexible protocol and a close integration of the WINNER modes.The first steps towards concepts harmonisation are presented by categorising the large number ofdeployment concept proposals coming from D3.1 into logical groups. Further results on the comparisonbetween single-hop and multi-hop are shown in D3.2 accompanied by the presentation and assessment ofrelated routing strategies. Also the cooperative relaying concept has been driven forward and new resultshave been achieved in this field.Next to multi-hop, the single hop based deployment concepts have been elaborated partly with respect tonew air interface technologies. Finally D3.2 describes a system level simulation methodology to simulatethe deployment concepts based on the new WINNER air interface taking the agreed scenarios intoaccount.
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