Author: Earl S. Marmar
Publisher:
ISBN:
Category :
Languages : en
Pages : 38
Book Description
Impurity Injection Experiments on the Alcator C Tokamak
Author: Earl S. Marmar
Publisher:
ISBN:
Category :
Languages : en
Pages : 38
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 38
Book Description
Impurity Injection Experiments on the Alcator C-Mod Tokamak
Author: Michael Anthony Graf
Publisher:
ISBN:
Category :
Languages : en
Pages : 190
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 190
Book Description
Impurity Generation During Intense Lower Hybrid Heating Experiments on the Alcator C Tokamak
Author: Earl S. Marmar
Publisher:
ISBN:
Category :
Languages : en
Pages : 20
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 20
Book Description
Impurity Screening Studies in the Alcator C-mod Tokamak
Author: G. M. McCracken
Publisher:
ISBN:
Category :
Languages : en
Pages : 9
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 9
Book Description
Impurity Plume Experiments in the Edge Plasma of the Alcator C-Mod Tokamak
Author: Sanjay Gangadhara
Publisher:
ISBN:
Category :
Languages : en
Pages : 86
Book Description
The physics of impurity transport in response to a local gas injection in the scrape-off-layer (SOL) of Alcator C-Mod is investigated. Carbon "plumes'' are formed at variable locations in the SOL -- up to the separatrix -- by puffing deuterated ethylene gas (C2D4) through the end of a reciprocating fast-scanning probe. CCD cameras are used to simultaneously record C+1 and C+2 emission patterns from two near-perpendicular views. The plume dispersal patterns are found to yield direct qualitative information about plasma flow, including the direction of VExB near the separatrix. Impurity transport and plasma-surface interaction physics implicit in the 3-D plume structure is explored in detail using a Monte Carlo impurity transport code, with the aim of extracting background plasma-flow quantities. A number of important local effects involving plasma-probe interaction have been identified: a vertical ExB drift near the probe surface, a parallel electric field above the probe tip arising from plasma recycling off the probe surface, and sputtering of a carbon layer that dynamically forms on the probe surface. The emission patterns are also found to yield important information on flows in the SOL: radial electric field (Er) in the near SOL and volume-averaged values of the parallel Mach number in the far SOL. Er values obtained from plume data compare favorably with estimates of Er based on the poloidal propagation velocity of edge plasma fluctuations measured by the scanning probe. Comparisons between parallel Mach numbers obtained from the plume data and probe measurements indicate that the probe over-estimates the parallel flow towards the divertor in the far SOL. This result supports the picture of particle balance in the SOL of Alcator C-Mod being dominated by main-chamber recycling, with weak plasma flow into the divertor.
Publisher:
ISBN:
Category :
Languages : en
Pages : 86
Book Description
The physics of impurity transport in response to a local gas injection in the scrape-off-layer (SOL) of Alcator C-Mod is investigated. Carbon "plumes'' are formed at variable locations in the SOL -- up to the separatrix -- by puffing deuterated ethylene gas (C2D4) through the end of a reciprocating fast-scanning probe. CCD cameras are used to simultaneously record C+1 and C+2 emission patterns from two near-perpendicular views. The plume dispersal patterns are found to yield direct qualitative information about plasma flow, including the direction of VExB near the separatrix. Impurity transport and plasma-surface interaction physics implicit in the 3-D plume structure is explored in detail using a Monte Carlo impurity transport code, with the aim of extracting background plasma-flow quantities. A number of important local effects involving plasma-probe interaction have been identified: a vertical ExB drift near the probe surface, a parallel electric field above the probe tip arising from plasma recycling off the probe surface, and sputtering of a carbon layer that dynamically forms on the probe surface. The emission patterns are also found to yield important information on flows in the SOL: radial electric field (Er) in the near SOL and volume-averaged values of the parallel Mach number in the far SOL. Er values obtained from plume data compare favorably with estimates of Er based on the poloidal propagation velocity of edge plasma fluctuations measured by the scanning probe. Comparisons between parallel Mach numbers obtained from the plume data and probe measurements indicate that the probe over-estimates the parallel flow towards the divertor in the far SOL. This result supports the picture of particle balance in the SOL of Alcator C-Mod being dominated by main-chamber recycling, with weak plasma flow into the divertor.
Vacuum Ultraviolet Study of Impurity Generation During ICRF Heating Experiments on the Alcator C Tokamak
Author: Herbert Leslie Manning
Publisher:
ISBN:
Category : Tokamaks
Languages : en
Pages : 440
Book Description
Publisher:
ISBN:
Category : Tokamaks
Languages : en
Pages : 440
Book Description
Fusion Energy Update
Author:
Publisher:
ISBN:
Category : Controlled fusion
Languages : en
Pages : 100
Book Description
Publisher:
ISBN:
Category : Controlled fusion
Languages : en
Pages : 100
Book Description
Observations of Centrally Peaked Impurity Profiles in the Alcator-C Tokamak Following Pellet Injection
Author: R. D. Petrasso
Publisher:
ISBN:
Category :
Languages : en
Pages : 24
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 24
Book Description
An Experimental Study of Visible and Ultraviolet Impurity Emission from the Alcator C Tokamak
Author: Juan Carlos Moreno
Publisher:
ISBN:
Category :
Languages : en
Pages : 137
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 137
Book Description
ERDA Energy Research Abstracts
Author:
Publisher:
ISBN:
Category : Power resources
Languages : en
Pages : 1144
Book Description
Publisher:
ISBN:
Category : Power resources
Languages : en
Pages : 1144
Book Description