Author: G. M. McCrackenPublisher:
ISBN:
Category :
Languages : en
Pages : 9
Book Description
Impurity Screening Studies in the Alcator C-mod Tokamak
Author: G. M. McCrackenA Comparison of Impurity Screening Between Limiter and Divertor Plasmas in the Alcator C-Mod Tokamak
Author: Robert Seth GranetzScreening of Recycling and Non-recycling Impurities in the Alcator C-Mod Tokamak
Author: G. M. McCrackenImpurity Transport Studies on Alcator C-Mod Tokamak Using Charge Exchange Recombination Spectroscopy
Author: Igor Olegovich BespamyatnovPublisher:
ISBN:
Category : Charge exchange
Languages : en
Pages : 322
Book Description
A Charge-Exchange Recombination Spectroscopy (CXRS) diagnostic has been installed on Alcator C-Mod to study the transport of light impurities in plasma. The system provides spatially (1 cm) and temporally (12.5 msec) resolved measurements of the impurity density, temperature and flow velocities of the particular impurity. Two optical arrays: poloidal (19 channels) and toroidal (10 channels), collect the light emitted from excited impurity ion populated by charge exchange process from the Diagnostic Neutral Beam (DNB) particle. The attention of this dissertation is focused on the B4 (n = 7 [-->] 6) spectral line emitted by B4 ion formed in the following charge exchange reaction (H0 + B5+ [-->] H+ + B4+*). A complex spectral model was developed to simulate emission. The high magnetic fields of C-Mod result in broad Zeeman patterns which must be taken into account for the interpretation of the line shift and broadening in terms of impurity ion velocity and temperature. After the spectral line fitting and careful identification of the charge exchange component, the calculated Doppler broadening and shifts of the spectral line profile yield information on the ion temperature and rotation. Together with the calculation of the beam density, the absolute calibration of the CXRS optical system provides us with B5+ density measurement capabilities. One of the main objectives of this work was to use the acquired impurity density, temperature and flow velocity profiles to investigate plasma transport behavior and infer the radial electric field E[subscript R] from plasma force balance equation. The focus here was placed on the region of the Internal Transport Barrier (ITB) formation 0.35
Impurity Injection Experiments on the Alcator C-Mod Tokamak
Author: Michael Anthony GrafPublisher:
ISBN:
Category :
Languages : en
Pages : 190
Book Description
Impurity Transport in the Divertor of the Alcator C-Mod Tokamak
Author: G. M. McCrackenMeasurement of Impurity Ion Densities and Energies in the Divertor and Edge Regions of Alcator C-Mod Tokamak. [Lab. for Plasma Research, Univ. of Maryland, College Park].
![Measurement of Impurity Ion Densities and Energies in the Divertor and Edge Regions of Alcator C-Mod Tokamak. [Lab. for Plasma Research, Univ. of Maryland, College Park]. PDF](https://books.google.com/books/content/images/frontcover/rrirAQAACAAJ?fife=w80-h100)
Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 6
Book Description
A study to investigate impurity production and transport in the divertor and edge regions of the Alcator C-Mod tokamak through spectroscopic techniques is described. A 0.75-meter Czerny-Turner spectrometer with a 1200-g/mm grating and a 35-meter quartz optic bundle transmission line were tested. A high-resolution 2-meter spectrometer will be ordered. Data acquisition considerations are being addressed. (RWR).
Author: Mark J. May
Author: Dimitrios Pappas
Author: Earl S. Marmar