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Method for measuring radial impurity emission profiles using correlations of line integrated signals
KTH, School of Engineering Sciences (SCI), Physics.
KTH, School of Electrical Engineering (EES), Centres, Alfvén Laboratory Centre for Space and Fusion Plasma Physics.ORCID iD: 0000-0002-5259-0458
KTH, School of Electrical Engineering (EES), Centres, Alfvén Laboratory Centre for Space and Fusion Plasma Physics.
KTH, School of Engineering Sciences (SCI), Physics.
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2006 (English)In: Review of scientific instruments, ISSN 0034-6748, Vol. 77, no 4, 043508- p.Article in journal (Refereed) Published
Abstract [en]

A method of determining radial impurity emission profiles is outlined. The method uses correlations between line integrated signals and is based on the assumption of cylindrically symmetric fluctuations. Measurements at the reversed field pinch EXTRAP T2R show that emission from impurities expected to be close to the edge is clearly different in raw as well as analyzed data to impurities expected to be more central. Best fitting of experimental data to simulated correlation coefficients yields emission profiles that are remarkably close to emission profiles determined using more conventional techniques. The radial extension of the fluctuations is small enough for the method to be used and bandpass filtered signals indicate that fluctuations below 10 kHz are cylindrically symmetric. The novel method is not sensitive to vessel window attenuation or wall reflections and can therefore complement the standard methods in the impurity emission reconstruction procedure.

Place, publisher, year, edition, pages
2006. Vol. 77, no 4, 043508- p.
Keyword [en]
reversed-field pinch, density-fluctuations, transport, plasma, system
National Category
Atom and Molecular Physics and Optics
Identifiers
URN: urn:nbn:se:kth:diva-6557DOI: 10.1063/1.2195122ISI: 000237136500018Scopus ID: 2-s2.0-33646428654OAI: oai:DiVA.org:kth-6557DiVA: diva2:11302
Note

QC 20150727

Available from: 2006-12-11 Created: 2006-12-11 Last updated: 2015-07-27Bibliographically approved
In thesis
1. Diagnostics for advanced fusion plasma scenarios
Open this publication in new window or tab >>Diagnostics for advanced fusion plasma scenarios
2006 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [en]

Over the past decade, fusion research has showed the potential of being a main candidate for energy production for future generations. Further advances in improved fusion performance are therefore vital. This thesis focuses on advanced fusion plasma scenarios and their diagnostic requirements. In particular the design of a motional Stark effect (MSE) diagnostic at the MAST spherical tokamak and the analysis of magneto-hydrodynamic mode feedback control and pulsed poloidal current drive (PPCD) at the reversed field pinch (RFP) experiment EXTRAP T2R are discussed.

The MSE diagnostic is important for the determination of the plasma current profile, information that is necessary for studies in advanced confinement scenarios like reversed shear profiles or current holes. The MAST MSE system has two channels and selects the spectral components using 1Å FWHM interference filters. The diagnostic has been commissioned during the fall of 2006 and the results show the feasibility of the technique with rms-noise ~0.5° using a time resolution of 1 ms. Investigations of mirror labyrinths for the future ITER MSE diagnostic highlight the need for careful calibration considerations.

Feedback control and PPCD are techniques for improved confinement. Feedback control dramatically decreases impurity influx at the end of discharges while transport in the bulk plasma is largely unaffected. During PPCD the transport is seen to decrease and it is demonstrated that PPCD and feedback control can be employed simultaneously.

New and innovative techniques for fusion spectroscopy are furthermore described. This includes the use of correlations in line integrated signals to determine ion emission profiles in poloidally symmetric environments. Good agreement with other diagnostic methods is obtained. The assessment of electron temperature profiles using measured differences between Thomson scattering and vacuum ultra-violet spectroscopy is also shown.

Place, publisher, year, edition, pages
Stockholm: KTH, 2006. xiv, 84 p.
Series
Trita-FYS, ISSN 0280-316X ; 2006:64
Keyword
MSE, PEM, mirror evolution, fusion, diagnostics, plasma spectroscopy, reversed field pinch, spherical tokamak, intelligent shell, PPCD, MAST, ITER
National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:kth:diva-4221 (URN)91-7178-474-8 (ISBN)
Public defence
2006-12-15, Sal F3, KTH, Lindstedtsvägen 26, Stockholm, 09:00
Opponent
Supervisors
Note
QC 20100907Available from: 2006-12-11 Created: 2006-12-11 Last updated: 2010-09-07Bibliographically approved

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Brunsell, Per R.Rachlew, Elisabeth

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