Open Access

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2017-07-25
13:19
OpenAccess [FZJ-2017-05158] Journal Article
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Conceptual study of ferromagnetic pebbles for heat exhaust in fusion reactors with short power decay length
ddc:333.7
Ferromagnetic pebbles are investigated as high heat flux (q∥) plasma facing components in fusion devices with short power decay length (λq) on a conceptual level. The ability of a pebble concept to cope with high heat fluxes is retained and extended by the acceleration of ferromagnetic pebbles in magnetic fields. [...]
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2017-07-25
13:10
OpenAccess [FZJ-2017-05157] Journal Article/Contribution to a conference proceedings
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Hadron Structure from the Feynman–Hellmann Theorem
34th annual International Symposium on Lattice Field Theory, LATTICE2016, Meeting locationSouthampton, UK, 24 Jul 2016 - 30 Jul 20162016-07-242016-07-30
Proceedings of Science LATTICE2016, 168 (2017)
ddc:530
The determination of hadronic form factors at large momentum transfers has been a challenging problem in lattice QCD simulations. Here we show how the Feynman–Hellmann method may be extended to non-forward matrix elements to calculate hadronic form factors in lattice QCD at much higher momenta than previously accessible. [...]
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2017-07-25
13:03
OpenAccess [FZJ-2017-05154] Journal Article/Contribution to a conference proceedings
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Towards a determination of the ratio of the kaon to pion decay constants
34th annual International Symposium on Lattice Field Theory, LATTICE2016, Meeting locationSouthampton, UK, 24 Jul 2016 - 30 Jul 20162016-07-242016-07-30
Proceedings of Science LATTICE2016, 284 (2017)
ddc:530
The SU(3) flavour symmetry breaking expansion in up, down and strange quark masses is extended from hadron masses to meson decay constants. This allows a determination of the ratio of kaon to pion decay constants in QCD. [...]
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2017-07-25
12:47
OpenAccess [FZJ-2017-05146] Journal Article/Contribution to a conference proceedings
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Viscosity of the pure SU(3) gauge theory revisited
34th International Symposium on Lattice Field Theory, LATTICE2016, Meeting locationSouthampton, UK, 24 Jul 2016 - 30 Jul 20162016-07-242016-07-30
Proceedings of Science LATTICE2016, 073 (2017)
ddc:530
We compute the Euclidean correlators of the energy-momentum tensor in Yang-Mills theory at finite temperature at zero and finite spatial momenta with lattice simulations. We perform continuum extrapolations of these quantities using Nt = 10;12;16 lattices. [...]
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2017-07-25
11:58
OpenAccess [FZJ-2017-05126] Journal Article/Contribution to a conference proceedings
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Disconnected hadronic contribution to the muon magnetic moment at the physical point
34th International Symposium on Lattice Field Theory, Meeting locationSouthampton, UK, 24 Jul 2016 - 30 Jul 20162016-07-242016-07-30
Proceedings of Science LATTICE 2016, 171 (2017)
ddc:530
We compute the slope and curvature, at vanishing four-momentum transfer squared, of the disconnected contribution of the leading order hadron vacuum polarization function, using lattice QCD. Calculations are performed with 2 + 1 + 1 flavors of staggered fermions directly at the physical values of the quark masses and in volumes of linear extent larger than 6 fm. [...]
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2017-07-25
11:30
OpenAccess [FZJ-2017-05122] Journal Article
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Effect of PFC Recycling Conditions on JET Pedestal Density
ddc:570
There is experimental evidence that the pedestal dynamics in type-I ELMy H-mode discharges is significantly affected by a change in the recycling conditions at the tungsten plasma-facing components (W-PFCs) after an ELM event. The integrated code JINTRAC has been employed to assess the impact of recycling conditions during type-I ELMs in JET ITER-like wall H-mode discharges. [...]
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2017-07-25
11:19
OpenAccess [FZJ-2017-05117] Journal Article
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Modelling of the JET DT Experiments in Carbon and ITER-like Wall Configurations
ddc:570
In this paper numerical simulations with the self-consistent COREDIV code of the planned JET DT experiments have been performed. First, record shot from the 1997 experiments was simulated and good agreement with experimental data has been found. [...]
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2017-07-25
11:10
OpenAccess [FZJ-2017-05115] Journal Article
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Surface biasing influence on the physical sputtering in fusion devices
ddc:530
A new simplified analytical expression for the electromagnetic field in the Debye sheath in the presence of an oblique magnetic field including surface biasing effect is suggested. It is in good agreement with the numerical solution of the integral equation for the potential distribution in the Debye sheath. [...]
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2017-07-25
11:02
OpenAccess [FZJ-2017-05112] Journal Article
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Improved ERO modelling for spectroscopy of physically and chemically assisted eroded beryllium from the JET-ILW
ddc:333.7
Physical and chemical assisted physical sputtering were characterised by the Be I and Be II line and BeD band emission in the observation chord measuring the sightline integrated emission in front of the inner beryllium limiter at the torus midplane. The 3D local transport and plasma-surface interaction Monte-Carlo modelling (ERO code [18]) is a key for the interpretation of the observations in the vicinity of the shaped solid Be limiter. [...]
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2017-07-25
10:51
OpenAccess [FZJ-2017-05107] Journal Article
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Limiter observations during W7-X first plasmas
ddc:530
During the first operational phase (referred to as OP1.1) of the new Wendelstein 7-X (W7-X) stellarator, five poloidal graphite limiters were mounted on the inboard side of the vacuum vessel, one in each of the five toroidal modules which form the W7-X vacuum vessel. Each limiter consisted of nine specially shaped graphite tiles, designed to conform to the last closed field line geometry in the bean-shaped section of the standard OP1.1 magnetic field configuration (Sunn Pedersen et al 2015 Nucl. [...]
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