Expose reconstructed local current-row components#152
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isw_qflux_NA=1 with in_file_pert='none' assembles an identically zero non-axisymmetric source. That zero vector is the Arnoldi seed, so its normalization divides by zero (0/0 -> NaN) and zhseqr then fails to converge at every step, spinning without qflux output. Reject the configuration in check() with a clear message instead.
Add an optional right-hand side to the non-axisymmetric solve: the drive of a single-helicity perturbation given by a radial corrugation field (delta B^s/B_0^phi)_mn and an electrostatic potential harmonic Phi_mn. The vpar corrugation piece enters the A1/A2 force channels with velocity weights a3m and x^2 (sigma-odd), the ExB piece with weights x^-1 and a1m (sigma-even); the two new velocity moments are computed in compute_sources. Input via new &ntv_input variables (isw_hel_drive, m_theta_hel, hel_brad_re/im, hel_phim_re/im), default off. Band profiles, moments and dimensional prefactors follow a CAS-checked derivation (see issue #118). Off by default: golden-record QL summary.h5 is reproduced to 1e-15 against a main build.
Review findings on the drive commit: fold the x^(3k-4) weight into a single power so the x=0 quadrature node stays finite; skip the moment quadrature on the precomputed-matrix-element path and reject isw_hel_drive at run time when the moments are unavailable; reject the unvalidated relativistic branch, reconstruction mode and unset species data; deallocate asource_hel in collop_unload.
The zero-source guard added upstream rejects isw_qflux_NA=1 with in_file_pert='none'. With the misalignment drive, that configuration is valid: the drive supplies the non-axisymmetric source. Relax the guard so it fires only when the drive is off or all its amplitudes are zero.
The opposite-helicity drive (m,n) -> (m,-n) enters add_helical_source as the complex conjugate of the band profile (phase convention exp(+i(m theta + n phi))). The assembly stencil is a real-coefficient linear map, so it must conjugate the assembled source pointwise; a sign or phase error in the stencil breaks this. The existing checks use a profile whose real and imaginary parts vary independently, so they do not exercise conjugate symmetry. Add a check that conjg(profile) yields conjg(source) to 1e-14, plus a vacuity guard that the source carries an imaginary part. Verification: - ctest helical_source_test: Passed (0.07 s) - ctest -LE external-data: 18/18 passed - red-before: injecting a complex coefficient (1,0.1) into one stencil term makes the new check error stop with 'conjugate profile did not conjugate the source pointwise' (exit 1)
Decompose the phi-integrated current channel qflux(2,k) = sum_col flux_vector(2,col)*source_vector(col,k) into its per-field-line-point contributions in the mode-1 local (axi) solver, which HELCORE uses. The new pointwise_current_mod reuses the already-verified flux_vector current row: its counter-passing block enters with the explicit minus sign (parallel current is odd under sigma -> -sigma) and the step_factor phi-quadrature weight is baked in, so the decomposition introduces no new sign, weight, or normalization. flux_vector's columns partition into disjoint per-istep blocks, so the block dot products sum back to qflux(2,k) exactly. The solver writes current_profile.dat (phi_mfl, per-drive contributions, and current densities) guarded by isw_hel_drive, so runs without the helical drive are bitwise unchanged. A hard self-check stops the run if the field-line sum does not reproduce qflux(2,k). Verification: - 17/17 TEST ctests pass; new pointwise_current_test added. - Red-before: breaking the block partition (nblk without the npassing+1) gives "ERROR STOP FAIL: per-point contributions do not sum to the qflux current channel"; restored -> Passed. - Local HELCORE simple_l1 run, all three drive cases (nminus_phi, nminus_phi_im, nplus_phi): gamma_current/D31/D32 reproduce the accepted aCluster response (-7.338706/-20.944508, -2.711060/-3.138948, -2.369674/-1.825414) to ~1e-11; each current_profile.dat reconstructs qflux(2,k) to ~1e-15 relative over 961 finite points.
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Parent stack head: PR #151 at
fd22f71. This cumulative PR targetsmainand remains unmerged with the feature stack.Write one tagged HDF5 response file for every stage-2 reconstructed propagator. Each file retains the co-passing and signed counter-passing current-row contractions before spatial quadrature, the separate directional weights, geometry, passing-grid size, and the weighted local qflux partition.
The globally reconstructed incoming boundary rows remain authoritative. Summing all 199 tagged partitions reproduces the final joined current-row qflux, including the response represented by
join_ripplesandjoin_ends.Physics and numerical invariants:
A1,A3,A2.gamma_out/D31/D32are unchanged.Verification
Test fails on main
The previous single-call
qflux_current_contributions.datis replaced on every ripple call and cannot decompose final joined qflux.Test passes after fix
The focused
qflux_profiletest passes. All added lines are at most 88 columns; the two newly formatted files passfo fmt --check.