SPARK Version 1. 1 user manual

Abstract

This manual describes the input required to use Version 1.1 of the SPARK computer code. SPARK 1.1 is a library of FORTRAN main programs and subprograms designed to calculate eddy currents on conducting surfaces where current flow is assumed zero in the direction normal to the surface. Surfaces are modeled with triangular and/or quadrilateral elements. Lorentz forces produced by the interaction of eddy currents with background magnetic fields can he output at element nodes in a form compatible with most structural analysis codes. In addition, magnetic fields due to eddy currents can be determined at points off the surface. Version 1.1 features eddy current streamline plotting with optional hidden-surface-removal graphics and topological enhancements that allow essentially any orientable surface to be modeled. SPARK also has extensive symmetry specification options. In order to make the manual as self-contained as possible, six appendices are included that present summaries of the symmetry options, topological options, coil options and code algorithms, with input and output examples. An edition of SPARK 1.1 is available on the Cray computers at the National Magnetic Fusion Energy Computer Center at Livermore, California. Another more generic editfon is operational on the VAX computers at the Princeton Plasma Physics Laboratory and is available on magnetic tape by request. The generic edition requires either the GKS or PL0T10 graphics package and the IMSL or NAG mathematical package. Requests from outside the United States will be subject to applicable federal regulations regarding dissemination of computer programs. G ?. STEP 1: Pre-Processor Step 1 is called the Pre-Processor and has three r,win options: (1) read data for a new model and generate the basic booklteeping files; (?) plot the input geometry; (3) generate the mesh resistance and inductance matrices. The resistance and inductance calculations are the most time-consuming and are usually deferred until the model geometry has been at least preliminarily checked and plotted. SPARK does make a number of checks for internal consistency of the data, but errors are still possible. Appendices D and E give examples of many of the plot options available in Step 1.

Design criteria and current status of LHCD system on SST1 machine

“…Here x-direction refers to the direction of the plasma current, y-direction refers to radial direction of the machine and z-direction refers to the vertical direction (azimuthal) of the machine. More elaborate disruption induced forces and stresses are estimated using SPARK code [19]. Peak current induced is about 6 kA for 220 kA of plasma current disrupting in 0.1 ms and agrees reasonably well with our simple model (four times the current predicted from SPARK code).…”

Equilibrium properties of spherical torus plasmas in NSTX

“…Measurements of the currents in the passive conducting plates and the divertor plates are not yet available. Calculations using the SPARK code [6] of the 3-D eddy currents in these regions during an NSTX discharge indicate axisymmetric equivalent currents that flow in opposing directions in the top and bottom of a given plate. The magnitude of these currents is a few kiloamps.…”

An efficient modeling of fine air-gaps in tokamak in-vessel components for electromagnetic analyses

“…Some commercially available FEM tools are often beneficial to relatively large-scale analyses, in practical point of view, to implement a numerical model based on the drawings of design model. Due to the presence of thick shield/breeding blankets, the design of a reactor-grade plasma device in the future, as much as ITER, will prefer solid mesh FEM tools to any shell model [6][7][8] which describes induced current solving set of Maxwell equations [7,8] or coupled circuit equation matrix on 2D surfaces [9], in spite the shell is likely to be applicable to the design of present-day tokamaks due to the small width of conducting structures compared with characteristic dimension of a device. In addition, the commercial software such as ANSYS-EM TM [10] also can be applied to an integrated analysis of EM loads and ensuing mechanical or thermo-hydraulic loads.…”