Transport Studies in the Scrape-off Layer and Divertor of Alcator C-Mod
Title | Transport Studies in the Scrape-off Layer and Divertor of Alcator C-Mod PDF eBook |
Author | Brian LaBombard |
Publisher | |
Pages | 11 |
Release | 1996 |
Genre | |
ISBN |
The Scrape-off-layer in Alcator C-Mod
Title | The Scrape-off-layer in Alcator C-Mod PDF eBook |
Author | James L. Terry |
Publisher | |
Pages | 68 |
Release | 2005 |
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ISBN |
(cont.) Evidence that this turbulent transport may play an important role in the core-plasma density limit is presented. Much lower levels of turbulence and no blobs are observed in the high-field-side scrape-off-layer. For single-null magnetic configurations, plasma in the inboard scrape-off-layer appears to be almost entirely a result of plasma flow along field lines from the low-field side. Strong parallel flows with sensitivity to magnetic topology are found, along with strong evidence for momentum coupling between these scrape-off-layer flows and core toroidal rotation
Particle Transport in the Scrape-off Layer and Its Relationship to Discharge Density Limit in Alcator C-Mod
Title | Particle Transport in the Scrape-off Layer and Its Relationship to Discharge Density Limit in Alcator C-Mod PDF eBook |
Author | Brian LaBombard |
Publisher | |
Pages | 46 |
Release | 2001 |
Genre | |
ISBN |
(Cont) Small gradients and larger fluctuation levels with longer correlation times are found outside this region (far SOL). Deff in the near SOL increases strongly with local plasma collisionality normalized to the magnetic connection length. As the discharge density limit is approached, Deff and associated fluctuation levels become large across the entire SOL and cross-field heat convection everywhere exceeds parallel conduction losses, impacting the power balance of the discharge.
Comparison of theoretical models for scrape-off layer widths with data from COMPASS-D, JET and Alcator C-MOD
Title | Comparison of theoretical models for scrape-off layer widths with data from COMPASS-D, JET and Alcator C-MOD PDF eBook |
Author | J. W. Connor |
Publisher | |
Pages | 28 |
Release | 1998 |
Genre | Plasma (Ionized gases) |
ISBN |
Local Impurity Puffing as a Scrape-off Layer Diagnostic on the Alcator C-Mod Tokamak
Title | Local Impurity Puffing as a Scrape-off Layer Diagnostic on the Alcator C-Mod Tokamak PDF eBook |
Author | David F. Jablonski |
Publisher | |
Pages | 13 |
Release | 1996 |
Genre | |
ISBN |
Doppler Measurements in the Edge of the Alcator C-Mod Tokamak Using a High-resolution Visible Spectrometer
Title | Doppler Measurements in the Edge of the Alcator C-Mod Tokamak Using a High-resolution Visible Spectrometer PDF eBook |
Author | Alexander Turner Graf |
Publisher | |
Pages | 390 |
Release | 2008 |
Genre | |
ISBN |
Flow Measurements in the Scrape-off Layer of Alcator C-Mod Using Impurity Plumes
Title | Flow Measurements in the Scrape-off Layer of Alcator C-Mod Using Impurity Plumes PDF eBook |
Author | Sanjay Gangadhara |
Publisher | |
Pages | 20 |
Release | 2002 |
Genre | |
ISBN |
Accurate measurements of plasma flows in the scrape-off layer (SOL) are a necessary requirement for understanding the physics of tokamak edge plasmas. A system is being developed on Alcator C-Mod for inferring flows parallel (v) and perpendicular (vE x B) to local magnetic field lines from impurity emission patterns ("plumes") generated by local gas injection. Carbon plumes are generated at variable location in the SOL by puffing deuterated ethylene gas (C2D4) through the end of a reciprocating fast-scanning probe. Two intensified CCD cameras are used to record C+1 and C+2 emission patterns simultaneously from near-perpendicular views. Plumes are modeled using a Monte Carlo impurity transport code, from which values for the background flows may be extracted. The sensitivity of the plume structure is investigated for a number of code inputs, including radial electric field (Er) and the neutral launch dynamics. Initial modeling results indicate discrepancies between values of v and Er extracted from the plumes and measurements obtained from probe data. Key words: Alcator C-Mod; Scrape-Off Layer Flows; Plumes.