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[WIP] tracker - #863
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[WIP] tracker#863
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…ial correction back and update tests
…but now gives tracking error
…test straight vs curved for a1, b1, bs that should spot this type of bugs
Expose FieldExpansion field evaluation API
Move the FieldExpansion implementation out of the removed elements.py module and export its factory and concrete classes through beam_elements. Extend the public import checks. Upstream now builds kernels directly from classes, so the removed element initialization table is no longer needed.
Use one concrete element with C-level straight and curved dispatch, cache-aware coefficient updates, integrated strengths, and read-only geometry. Support environment operations, reject unsupported radiation and spin tracking, and update examples and regression tests. Add thick slices that share parent data and track their longitudinal interval. Preserve offsets when slicing again and cover tracking, backtracking, survey, and Twiss strengths.
giadarol
requested changes
Sep 24, 2026
Add zero-filled optional coefficients, common field scaling, and explicit uniform normal/skew strengths with cache-aware updates. Derive read-only profile order and allocation metadata from the coefficient arrays. Use integrator and num_integration_steps, remove the nstep alias, and update examples and environment expressions. Support standard magnet misalignments for elements and thick slices, clean serialization, and xobject wrapping. Include scalar contributions in Twiss strengths once. Update coverage for construction, scaling, lifecycle, misalignments, slicing, and strength extraction; remove obsolete radiation/spin guard tests. Validation: 164 tests passed, 4 skipped; example smoke checks passed.
3 of 6 tasks
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Description
This is built on top of #797
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