Paper  Title  Page 

TUPAS078  Status of FARTECH's ECR Ion Source Optimization Modeling  1829 


Funding: Work supported by the US Department of Energy, under a SBIR grant No. DEFG0204ER83954. The electron cyclotronresonance ion source (ECRIS) is one of the most efficient ways to provide highquality, highchargestate ion beam for research and development of particle accelerators and atomic physics experiments. For ECR ion source performance optimization, FARTECH Inc. is developing an integrated suite of computer codes: the Generalized ECRIS plasma Modeling code (GEM), the MCBC (Monte Carlo Beam Capture) module, to study beam capture and chargebreeding processes in ECRIS, and the extraction section code. Our recent progress includes the following: algorithm update of Coulomb collision in MCBC for more accurate calculations of the beam capture efficiency, which depends on beam energy and the background plasma, 2D extension of GEM by adding the radial dimension, and the ion extraction section modeling using an adaptive technique. 

TUPAS079  2D Extension of GEM (The Generalized ECR Ion Source Modeling Code)  1832 


Funding: Work supported by the US Department of Energy, under a SBIR grant No. DEFG0204ER83954 To model ECRIS, GEM is being extended to 2D by adding radial dimension. The electron distribution function (EDF) is calculated on each magnetic flux surface using a bounceaveraged FokkerPlanck code with 2D ECR heating (ECRH) modeling. The ion fluid model is also being extended to 2D by adding collisional radial transport terms. All species in ECRIS are balanced by keeping the neutrality in each cell and the plasma potential is calculated by maintaining the ambipolarity globally. The graphical user interface (GUI) and parallel computing ability of GEM make it an easytouse tool for ECRIS research. Numerical results and comparisons with experimental data will be presented. 