A fast scanning Langmuir probe system for ASDEX-Upgrade divertor

Tsois, N.; Dorn, C.; Kyriakakis, G.; Markoulaki, M.; Pflug, M.; Schramm, G.; Theodoropoulos, P.; Xantopoulos, P.; Weinlich, M.

doi:10.1016/s0022-3115(98)00569-8

Cited by 33 publications

(35 citation statements)

References 10 publications

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“…The neutrals then travel upstream in a 2D way by leaving the zone sidewards and getting through multiple reflections at the side walls and the plasma into hotter upstream regions where they are ionised (5-7 eV) [62]. In this ionisation front zone one drives quite large Mach flows even up to or above Mach 1 (as measured with a fast movable Langmuir divertor probe [156]) due to the large neutral sources there (Fig. 128).…”

Section: Detachment Propertiesmentioning

confidence: 99%

Plasma Edge Physics with B2‐Eirene

Schneider

Bonnin

Borraß

et al. 2006

Contrib. Plasma Phys.

478

426

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The B2‐Eirene code package was developed to give better insight into the physics in the scrape‐off layer (SOL), which is defined as the region of open field‐lines intersecting walls. The SOL is characterised by the competition of parallel and perpendicular transport defining by this a 2D system. The description of the plasma‐wall interaction due to the existence of walls and atomic processes are necessary ingredients for an understanding of the scrape‐off layer. This paper concentrates on understanding the basic physics by combining the results of the code with experiments and analytical models or estimates. This work will mainly focus on divertor tokamaks, but most of the arguments and principles can be easily adapted also to other concepts like island divertors in stellarators or limiter devices. The paper presents the basic equations for the plasma transport and the basic models for the neutral transport. This defines the basic ingredients for the SOLPS (Scrape‐Off Layer Plasma Simulator) code package. A first level of understanding is approached for pure hydrogenic plasmas based both on simple models and simulations with B2‐Eirene neglecting drifts and currents. The influence of neutral transport on the different operation regimes is here the main topic. This will finish with time‐dependent phenomena for the pure plasma, so‐called Edge Localised Modes (ELMs). Then, the influence of impurities on the SOL plasma is discussed. For the understanding of impurity physics in the SOL one needs a rather complex combination of different aspects. The impurity production process has to be understood, then the effects of impurities in terms of radiation losses have to be included and finally impurity transport is necessary. This will be introduced with rising complexity starting with simple estimates, analysing then the detailed parallel force balance and the flow pattern of impurities. Using this, impurity compression and radiation instabilities will be studied. This part ends, combining all the elements introduced before, with specific, detailed results from different machines. Then, the effect of drifts and currents is introduced and their consequences presented. Finally, some work on deriving scaling laws for the anomalous turbulent transport based on automatic edge transport code fitting procedures will be described. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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Section: Detachment Propertiesmentioning

confidence: 99%

Plasma Edge Physics with B2‐Eirene

Schneider

Bonnin

Borraß

et al. 2006

Contrib. Plasma Phys.

478

426

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“…Impurity transport is related to material migration, tritium co-deposition, and core contamination -issues that are crucial for ITER and commercial fusion power. The radial profiles of the SOL flow has been measured in ASDEX Upgrade (AUG) close to the x-point for both divertor legs using a reciprocating Langmuir probe [3] and spectroscopy [4], and in the low field side (LFS) midplane using a Langmuir probe [5]. Also, charge exchange recombination spectroscopy (CXRS) core rotation measurements exists for both the HFS [6] and LFS [7].…”

Section: Introductionmentioning

confidence: 99%

Measurements and ERO simulations of carbon flows in the high-field side main SOL in AUG

Makkonen

Groth

Airila

et al. 2013

Journal of Nuclear Materials

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The plasma flow in the SOL is important for impurity migration. There are few measurements from the HFS main SOL. To study the flow in the HFS SOL of ASDEX Upgrade, methane was injected from a HFS valve. The ensuing carbon emission distribution was followed using a fast video camera and a spectrometer was used to determine the Doppler shift of the injected carbon. This was carried out in lower single null L-mode and H-mode for low and high density plasmas. To elucidate the coupling between the flow of the injected carbon and the actual deuterium flow, ERO simulations were utilized. A strong carbon and deuterium flow towards the lower inner divertor was observed for high density plasmas in the far SOL along with a shear in the flow profile.

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“…Electrical probe diagnostics (EPDs) have been well known as a useful tool for the diagnosis of the characteristics of edge plasmas in tokamak machines [1][2][3]. It is required to measure plasma parameters in the edge region such as divertor and scrape off layer (SOL) in order to understand the phenomena in the edge plasma and to minimize the effect of the plasma wall interaction on the global performance of plasma because influx of impurity from wall due to plasma wall interaction may cause to contaminate the central plasma.…”

Section: Introductionmentioning

confidence: 99%

Electrical Probe Diagnostics for KSTAR

Bak

Lee

Kim

et al. 2010

Contrib. Plasma Phys.

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Electrical probe diagnostics (EPDs) for the Korea Superconducting Tokamak Advanced Research (KSTAR), which consists of three fast reciprocating Langmuir probe assemblies (FRLPAs) and two fixed edge Langmuir probe arrays (ELPAs), are proposed to diagnose edge plasma during a plasma discharge in the KSTAR machine. A FRLPA, which has been upgraded through its performance test, is installed at a horizontal port of the KSTAR vacuum vessel in order to get the radial profile of the plasma parameters in the scrape-off layer (SOL) region during the experimental campaign of 2009 in the KSTAR machine. The prototype fabricated for the ELPA is mounted on the outboard wall of the KSTAR vacuum vessel in order to investigate its performance during the campaign of 2009, which is required before the installation of one fixed EPLA on the plasma facing component (PFC) tiles inside the KSTAR vacuum vessel. In this work, the description of the KSTAR EPDs and their current activities including the technical issues for the installation in the KSTAR machine are presented.

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A fast scanning Langmuir probe system for ASDEX-Upgrade divertor

Cited by 33 publications

References 10 publications

Plasma Edge Physics with B2‐Eirene

Plasma Edge Physics with B2‐Eirene

Measurements and ERO simulations of carbon flows in the high-field side main SOL in AUG

Electrical Probe Diagnostics for KSTAR

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