Restrict Arnoldi solver to global route#136
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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.
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Summary
Stack dependency: #135 at
6e30459047a026f52da453eb9af59889107647a6. This PR remains pointed atmainand must not merge before its dependency.ArnoldiO2 is a periodic global qflux solver. Existing mode-3 golden records all use the one-propagator route; the solver directly imposes endpoint phase conditions and never defines local transfer/source/flux outputs. Historical transfer construction was unreachable from the initial import and was deleted as dead code in 2019. Sending mode 3 through the all-propagator route therefore has no defined numerical meaning.
The patch preserves the existing routing predicate and every supported mode-3 calculation. It does not change the kinetic operator, periodic boundary conditions, sparse solver, tolerances, discretization, convergence, output layout, ABI, or any supported result. Mode 1 remains the local propagator solver for general geometry.
Closes #134.
Verification
Failing before (
6e30459), mode 3 with general helical geometry:The earlier unguarded stack performed
0/0at the same undefined local column.Passing after (
37d7076):The same trapped Debug run now exits before ArnoldiO2 or
join_ripples:It produces no qflux output and reports no IEEE exception, NaN, SIGFPE, DGBSV failure, or partial transport result. This is configuration rejection, not a completed physics run.