Overview of ASDEX Upgrade results

Kaufmann, Michael; Schweinzer, J.; Albrecht, M.; Alexander, M.; Asmussen, K.; Becker, G.; Behler, K.; Behringer, K.; Behrisch, R.; Berger, E.L.; Bergmann, Andreas; Bessenrodt-Weberpals, M.; Borraß, K.; Bosch, H.‐S.; Braams, Bastiaan J.; Brambilla, M.; Braun, F.; Brinkschulte, H.; Brosig, Ch.; Buechl, K.; Buhler, A.; Callaghan, H. P.; Carlson, A.; Chodura, R.; Coster, D.; Cupido, L.; Blank, H. J. de; Hempel, S. De Pena; Deschka, S.; Dose, V.; Dorn, Christian; Dodel, G.; Drube, R.; Dux, R.; Egorov, A.S.; Engelhardt, W.; Engstler, J.; Fahrbach, H.‐U.; Fantz, U.; Feist, H. U.; Fiedler, S.; Fieg, G.; Field, A.R.; Franzen, P.; Fuchs, Julien; Fußmann, G.; Gafert, J.; Gantenbein, G.; García-Rosales, G.; Gehre, O.; Gernhardt, J.; Großmann, Tobias; Gruber, O.; Günter, S.; Haas, G.; Hallatschek, K.; Hartmann, D.; Heinemann, B.; Heimann, P.; Herrmann, A.; Herrmann, W.; Herppich, G.; Hertweck, F.; Hirsch, K.; Hirsch, S.; Hoek, M.; Hofmeister, F.; Hoenen, F.; Holzhauer, E.; Hohenöcker, H.; Ignácz, P. N.; Jacobi, D.; Jüttner, B.; Junker, W.; Kakoulidis, M.; Kallenbach, A.; Kapralov, V. G.; Karakatsanis, Nicolas A.; Kardaun, O.; Kass, T.; Kastelewicz, H.; Klepper, C. C.; Kollotzek, H.; Köppendörfer, W.; Kraus, Werner; Krieger, K.; Kurzan, B.; Kuteev, B. V.; Kyriakakis, G.; Lackner, K.; Lang, P. T.; Lang, R. S.; Lashkul, S. I.; Laux, M.; LeBlanc, B.P.; Lengyel, L.L.; Leonard, A.W.; Leuterer, F.; Lieder, G.; Loureiro, C.; Maier, H.; Maingi, R.; Manso, M. E.; Maraschek, M.; Markoulaki, M.; Mast, M.; McCarthy, Patrick J.; Meisel, D.; Meister, H.; Merkel, R.; Mertens, V.; Miroshnikov, I. V.; Müller, Hans; Münich, F.; Mürmann, H.; Napiontek, B.; Naujoks, D.; Neu, G.; Neu, R.; Neuhäuser, J.; Noterdaeme, J.-M.; Niethammer, Matthias; O'Shea, L.; Pacco-Düchs, M. G.; Pasch, E.; Pautasso, G.; Peeters, A. G.; Petravich, G.; Pitcher, C. S.; Poschenrieder, W.; Precht, J.; Puri, F.; Raupp, G.; Reinmüller, Karin; Reimerdes, H.; Riedl, R.; Rohde, V.; Röhr, H.; Roth, J.; Ryter, F.; Salzmann, H.; Sandmann, W.; Santos, J.; Scharich, W.; Schilling, H.-B.; Schittenhelm, M.; Schlogl, D.; Schneider, Hendrik; Schneider, Robert; Schneider, Ursula; Schneider, W.; Schönmann, K.; Schramm, G.; Schumacher, U.; Schütte, Thomas; Schweizer, Sabine; Schwörer, Ralf; Scott, B.; Seidel, U.; Šesnić, S.; Serra, F.; Silva, A.; Sokoll, Martin D.; Spathis, Panayotis; Speth, E.; Stäbler, A.; Steuer, K.-H.; Stöber, J.; Streibl, B.; Suttrop, W.; Thoma, A.; Tichmann, C.; Tisma, R.; Treutterer, W.; Troppmann, M.; Tsois, N.; Ulrich, M. H.; Varela, P.; Veselova, I.; Verbeek, H.; Verplancke, P.; Vollmer, O.; Wade, M. R.; Wedler, H.; Wenzel, U.; Wesner, F.; Weinlich, M.; Werthmann, H.; Wilhelm, R.; Wolf, R. C.; Wunderlich, R.; Wutte, D.; Xantopoulos, N.; Zanino, R.; Zasche, D.; Zehrfeld, H. P.; Zehetbauer, T.; Zilker, M.; Zohm, H.; Zouhar, Martin

doi:10.1088/0029-5515/41/10/306

Cited by 36 publications

(22 citation statements)

References 57 publications

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“…The experiment is performed on the ASDEX Upgrade tokamak [20] where the main plasma properties for four discharges used hereafter are shown in Fig. 1.…”

Section: The Experimental Setupmentioning

confidence: 99%

Turbulence during H- and L-mode plasmas in the scrape-off layer of the ASDEX Upgrade tokamak

Antar¹,

Tsalas²,

Wolfrum³

et al. 2008

Plasma Phys. Control. Fusion

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Abstract.We present evidence showing that the statistical properties of turbulence in the scrape-off layer (SOL) are not modified in a high-confinement mode (H-mode) inbetween edge-localized modes (ELMs) with respect to a low confinement mode (Lmode). The plasma being in the upper-single null magnetic configuration, the reciprocating probe around the bottom X-point is used characterize in the same discharge the low and the high-field scrape-off layer. In H-mode in-between ELMs, the average value and the standard deviation of the ion saturation current are found

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“…The experiment is performed on the ASDEX Upgrade tokamak [20] where the main plasma properties for four discharges used hereafter are shown in Fig. 1.…”

Section: The Experimental Setupmentioning

confidence: 99%

Turbulence during H- and L-mode plasmas in the scrape-off layer of the ASDEX Upgrade tokamak

Antar¹,

Tsalas²,

Wolfrum³

et al. 2008

Plasma Phys. Control. Fusion

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“…In other words, profile stiffness implies the non-linear dependence(s) of the thermal diffusivity. Studies of profile stiffness have been intensively pursued in tokamaks [1,2,[11][12][13][14][15][16]. In these studies, stiffness in the temperature profile has been mainly discussed in relation to the ion temperature gradient mode [11][12][13] or the electron temperature gradient mode [14][15][16].…”

Section: Iss95mentioning

confidence: 99%

“…Typically, L p -1 at 0.3 < ρ < 0.9 is reproduced by g′(ρ) within 20 % as is shown by the solid lines in the figure. It is possible to reproduce the electron pressure profiles in the high-collisionality regime using the following equations; p e (ρ) = F exp(-g(ρ)) , (2) g(ρ) = 1.5ρ 2 + 1.5ρ 10 .…”

Section: Frozen Profilementioning

confidence: 99%

“…On the other hand, many examples of confinement degradation in the high-density region have been reported from both of tokamak and helical plasma experiments [1][2][3][4]. Use of empirical scaling laws for the energy confinement time, τ E , is effective to identify the data deviating from the typical expectation, possibly due to a degradation or improvement of confinement.…”

Section: Introductionmentioning

confidence: 99%

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Electron Pressure Profiles in High-Density Neutral Beam Heated Plasmas in the Large Helical Device

Miyazawa

Yamada

Peterson

et al. 2005

J. Plasma Fusion Res.

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In the Large Helical Device (LHD), electron pressure profiles in gas-fueled high-density discharges tend to have a similar shape, as if these were frozen. This frozen profile is insensitive to variations in the magnetic field strength and moderate changes in the neutral beam heat deposition profile. At the same time, however, the absolute value of the electron pressure itself increases with the heating power, the electron density, and the magnetic field strength. In this study, a reference model for the electron pressure is proposed which consists of the frozen profile and parametric dependences derived from experimental observations. It is possible to define an operational regime where this typical profile appears by comparing the electron pressure profiles with this model. In the standard configuration, at which the maximum plasma stored energy in LHD has been obtained, the frozen profile appears in the plateau to the PfirshSchlüter regimes. As the collisionality decreases to the collisionless regime, the electron pressure becomes smaller than the prediction of the model and the deterioration is significant in the plasma core region. This tendency is enhanced in the configuration with the outward-shifted magnetic axis. The global energy confinement time, τ E , in the high-collisionality regime has a weaker density dependence together with the mitigated power degradation, scaling as τ E ∝ ne 0.28 P -0.43 (ne and P are the line-averaged density and the heating power, respectively), compared with the International Stellarator Scaling 95, where τ E ∝ ne 0.51 P -0.59 .

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“…ASDEX Upgrade is a medium-size tokamak that is equipped with powerful and versatile auxiliary heating systems: a variety of fast-ion populations can be generated by eight neutral beam injection (NBI) sources with a total power of 20 MW and four ion cyclotron resonance heating (ICRH) antennas with a total power of 6 MW [1][2][3]. ASDEX Upgrade is also equipped with a suite of fast-ion diagnostics: fast-ion loss detectors (FILDs) [4][5][6], fast-ion D α (FIDA) [7], collective Thomson scattering (CTS) [8][9][10][11][12][13], neutron spectrometry [14,15], neutral particle analysers (NPA) [16,17] and γ -ray spectrometry [18].…”

Section: Introductionmentioning

confidence: 99%

Combination of fast-ion diagnostics in velocity-space tomographies

et al. 2013

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Fast-ion D α (FIDA) and collective Thomson scattering (CTS) diagnostics provide indirect measurements of fastion velocity distribution functions in magnetically confined plasmas. Here we present the first prescription for velocity-space tomographic inversion of CTS and FIDA measurements that can use CTS and FIDA measurements together and that takes uncertainties in such measurements into account. Our prescription is general and could be applied to other diagnostics. We demonstrate tomographic reconstructions of an ASDEX Upgrade beam ion velocity distribution function. First, we compute synthetic measurements from two CTS views and two FIDA views using a TRANSP/NUBEAM simulation, and then we compute joint tomographic inversions in velocity-space from these. The overall shape of the 2D velocity distribution function and the location of the maxima at full and half beam injection energy are well reproduced in velocity-space tomographic inversions, if the noise level in the measurements is below 10%. Our results suggest that 2D fast-ion velocity distribution functions can be directly inferred from fast-ion measurements and their uncertainties, even if the measurements are taken with different diagnostic methods.

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Overview of ASDEX Upgrade results

Abstract: 1 See appendix. 2 See the author list of 'Overview of progress in European Medium Sized Tokamaks towards an integrated plasma-edge/wall solution' by Meyer [22].

Cited by 36 publications

References 57 publications

Turbulence during H- and L-mode plasmas in the scrape-off layer of the ASDEX Upgrade tokamak

Turbulence during H- and L-mode plasmas in the scrape-off layer of the ASDEX Upgrade tokamak

Electron Pressure Profiles in High-Density Neutral Beam Heated Plasmas in the Large Helical Device

Combination of fast-ion diagnostics in velocity-space tomographies

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