Date: 2026-09-05 Purpose: Bulk YBCO disk magnetized by a ramped background field.

What it shows

A bulk YBCO disk in a spherical air domain. A uniform background field along +z ramps to 1 T over one second and is then held. Screening currents build up in the disk; the deck is the plain three-dimensional bulk HTS case, with the built-in power law and no thin shells, cuts, or periodicity. disk_pulse uses the same geometry with a pulsed field from a plugin.

Files

file	role
disk.geo	geometry; mesh it with gmsh
input.conf	deck

Run

gmsh -3 disk.geo -o disk.msh

../../build/bin/belfem # or mpirun -np 4 ../../build/bin/belfem

Shared launcher

../scripts/Allrun generates the mesh, chooses ranks and threads, and can submit to Slurm; ../scripts/Allclean removes run output. To use them from this directory, copy the two wrapper scripts Allrun and Allclean from examples/helix/ here and run ./Allrun (./Allrun --dry-run prints the plan first). If you copy this deck out of the tree, copy examples/scripts/ along with it and point the wrappers at its new location. The launcher does not build plugins; do that step by hand as described above. Per-deck settings go in a run.conf next to input.conf; see ../scripts/README.md.