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Improved numerical grid generation techniques for the B2 edge plasma code

Description: Techniques used to generate grids for edge fluid codes such as B2 from numerically computed equilibria are discussed. Fully orthogonal, numerically derived grids closely resembling analytically prescribed meshes can be obtained. But, the details of the poloidal field can vary, yielding significantly different plasma parameters in the simulations. The magnitude of these differences is consistent with the predictions of an analytic model of the scrape-off layer. Both numerical and analytic grids … more
Date: June 1, 1992
Creator: Stotler, D. P. & Coster, D. P.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Improved numerical grid generation techniques for the B2 edge plasma code

Description: Techniques used to generate grids for edge fluid codes such as B2 from numerically computed equilibria are discussed. Fully orthogonal, numerically derived grids closely resembling analytically prescribed meshes can be obtained. But, the details of the poloidal field can vary, yielding significantly different plasma parameters in the simulations. The magnitude of these differences is consistent with the predictions of an analytic model of the scrape-off layer. Both numerical and analytic grids … more
Date: June 1, 1992
Creator: Stotler, D. P. & Coster, D. P.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Particle balance in a TFTR supershot

Description: Particle balance in a TFTR supershot is studied self-consistently. The TRANSP analysis code is used to model plasma parameters within the last closed flux surface, deriving time-dependent plasma profiles from measurements. The poloidal flux surfaces are derived using TRANSP and an equivalent-filament analysis code which distributes axisymmetric currents to match measurements of the poloidal field and flux and the total plasma current. The plasma in the edge and scrape off regions are modeled du… more
Date: January 1, 1992
Creator: Budny, R.V.; Coster, D.; Stotler, D.; Bell, M.G.; Janos, A.C. & Owens, D.K.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Particle balance in a TFTR supershot

Description: Particle balance has been studied self-consistently for a TFTR supershot during a relatively steady-state phase of the neutral beam injection. The TRANSP analysis code was used to model plasma parameters within the last closed flux surface, deriving time-dependent plasma profiles from measurements. The poloidal flux surfaces were obtained from TRANSP and an equivalent-filament analysis code. The edge plasma and recycling were modeled using the combined B2/DEGAS code with boundary conditions fro… more
Date: November 1, 1992
Creator: Budny, R.V.; Coster, D.; Stotler, D.; Bell, M.G.; Janos, A.C. & Owens, D.K.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Particle balance in a TFTR supershot

Description: Particle balance in a TFTR supershot is studied self-consistently. The TRANSP analysis code is used to model plasma parameters within the last closed flux surface, deriving time-dependent plasma profiles from measurements. The poloidal flux surfaces are derived using TRANSP and an equivalent-filament analysis code which distributes axisymmetric currents to match measurements of the poloidal field and flux and the total plasma current. The plasma in the edge and scrape off regions are modeled du… more
Date: May 1, 1992
Creator: Budny, R. V.; Coster, D.; Stotler, D.; Bell, M. G.; Janos, A. C. & Owens, D. K.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Particle balance in a TFTR supershot

Description: Particle balance has been studied self-consistently for a TFTR supershot during a relatively steady-state phase of the neutral beam injection. The TRANSP analysis code was used to model plasma parameters within the last closed flux surface, deriving time-dependent plasma profiles from measurements. The poloidal flux surfaces were obtained from TRANSP and an equivalent-filament analysis code. The edge plasma and recycling were modeled using the combined B2/DEGAS code with boundary conditions fro… more
Date: November 1, 1992
Creator: Budny, R. V.; Coster, D.; Stotler, D.; Bell, M. G.; Janos, A. C. & Owens, D. K.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Scrape-Off Layer Modeling Using Coupled Plasma and Neutral Transport Codes

Description: An effort is made to refine the neutral transport model used in the B2 edge plasma code by coupling it to the DEGAS Monte Carlo code. Results are discussed for a simulation of a high recycling divertor. It appears that on the order of 100 iterations between the two codes are required to achieve a converged solution. However, the amount of computer time used in the DEGAS simulations is large, making complete runs impractical for design purposes. On the other hand, the differences in the resultin… more
Date: May 1, 1992
Creator: Stotler, D. P.; Coster, D. P.; Ehrdardt, A. B.; Karney, C. F. F.; Petravic, M. & Braams, B. J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Scrape-off layer modeling using coupled plasma and neutral transport codes

Description: An effort is made to refine the neutral transport model used in the B2 edge plasma code by coupling it to the DEGAS Monte Carlo code. Results are discussed for a simulation of a high recycling divertor. It appears that on the order of 100 iterations between the two codes are required to achieve a converged solution. However, the amount of computer time used in the DEGAS simulations is large, making complete runs impractical for design purposes. On the other hand, the differences in the resultin… more
Date: May 1, 1992
Creator: Stotler, D. P.; Coster, D. P.; Ehrdardt, A. B.; Karney, C. F. F.; Petravic, M. & Braams, B. J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Simulating Divertor Detachment of Ohmic Discharges in ASDEX Upgrade Using SOLPS: the Role of Carbon

Description: With divertor detachment being a prerequisite for burning plasma operation in ITER, numerical codes such as SOLPS [1] have been developed for predicting and interpreting the divertor performance at all operational regimes in current tokamaks and ITER. In ITER complete detachment from the outer divertor target is not permitted as this might result in an X-point MARFE, imposing an upper limit for the upstream separatrix density, n{sub e}{sup sep}. Despite the knowledge of the basic mechanisms req… more
Date: June 27, 2007
Creator: Wischmeier, M; Coster, D; Chankin, A; Fuchs, C; Groth, M; Harhausen, J et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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