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Add user-defined Spin Map#1297

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cemitch99 wants to merge 18 commits intoBLAST-ImpactX:developmentfrom
cemitch99:add_user_spin_map
Open

Add user-defined Spin Map#1297
cemitch99 wants to merge 18 commits intoBLAST-ImpactX:developmentfrom
cemitch99:add_user_spin_map

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@cemitch99 cemitch99 commented Feb 6, 2026

The PR add an element that applies a user-defined spin map to the spin variables (sx, sy, sz)--a functionality that is similar to that of the user-defined LinearMap element. The LinearMap element is also updated for spin support--it leaves spin unaffected.

  • implement element inputs and input parsing
  • implement math for the spin push
  • implement Python bindings (esp. for user-facing input)
  • add C++ benchmark example
  • add Python benchmark example
  • update documentation

@ax3l ax3l added component: elements Elements/external fields component: spin tracking Spin tracking labels Feb 6, 2026
@cemitch99 cemitch99 requested review from ax3l and qianglbl February 6, 2026 22:42
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The Python bindings for the user-facing inputs, which use SmallMatrix type, need support similar to what we used for the LinearMap element.

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