Slash Command

/polcal

Polarization calibration sequence on a calibrated MS (Kcross → D-terms → Xf → applycal-with-parang). Follows skill 09-polcal-execution.md.

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How this command is triggered — by the user, by Claude, or both

Slash command

/radio-analyst:polcal

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No pre-commands

Configuration

Namespacecommands/

Tool Access

This command is limited to the following tools:

ms_workflow_statusms_pol_cal_feasibilityms_field_listms_parallactic_angle_vs_timems_setjy_polcalms_gaincalms_polcalms_applycalms_calsol_statsms_calsol_plotBashReadWrite

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Run polarization calibration on this MS: $ARGUMENTS

Read `.claude/skills/radio-interferometry/09-polcal-execution.md` before
starting. Prerequisite: delay.K, bandpass.B, and gain.G (or gain.fluxscaled)
must already exist — run `/project:calibrate` first if not.

**Workflow:**

1. `ms_workflow_status(ms_path, workdir)` — confirm calibration is complete.

2. `ms_pol_cal_feasibility(ms_path)` — go/no-go gate.
   Apply 09-polcal-execution.md §Feasibility gate table:
   - FULL         → Steps 3–6 (full polcal)
   - LEAKAGE_ONLY → Steps 4–5 only (D-terms, no Xf)
   - DEGRADED     → Steps 3–6 wit...

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LanguagePython

Stars2

MaintenanceExcellent

Last CommitApr 30, 2026

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Run polarization calibration on this MS: $ARGUMENTS

Read .claude/skills/radio-interferometry/09-polcal-execution.md before starting. Prerequisite: delay.K, bandpass.B, and gain.G (or gain.fluxscaled) must already exist — run /project:calibrate first if not.

Workflow:

ms_workflow_status(ms_path, workdir) — confirm calibration is complete.
ms_pol_cal_feasibility(ms_path) — go/no-go gate. Apply 09-polcal-execution.md §Feasibility gate table:
- FULL → Steps 3–6 (full polcal)
- LEAKAGE_ONLY → Steps 4–5 only (D-terms, no Xf)
- DEGRADED → Steps 3–6 with annotation
- NOT_FEASIBLE → STOP and report blocker.
ms_setjy_polcal(ms_path, field=angle_cal, reffreq_ghz=<band centre>, workdir, execute=False) → run. Populates MODEL for the angle cal.
Cross-hand delay: ms_gaincal(…, field=angle_cal, gaintype='KCROSS', solint='inf', combine='scan,spw', smodel=[1, 0, 1, 0], gaintable=[priorcals + K + B + G], caltable=workdir/kcross.K, execute=False) → run. ms_calsol_stats(kcross.K) — delay must be stable.
D-term leakage: ms_polcal(…, field=leakage_cal, poltype='Df+QU', solint='inf', combine='scan', gaintable=[priorcals + K + B + G + kcross], caltable=workdir/dterms.D, execute=False) → run. ms_calsol_stats(dterms.D) — D-term amplitudes < 0.1 expected.
Position angle (skip if LEAKAGE_ONLY): ms_polcal(…, field=angle_cal, poltype='Xf', solint='inf', combine='scan', gaintable=[priorcals + K + B + G + kcross + dterms], caltable=workdir/xfcal.X, execute=False) → run.
Applycal with parang=True (mandatory). Pass all 7 tables in order: priorcals → K → B → G → kcross → dterms → xfcal.

Output: summary of each polcal step, D-term amplitude distribution, confirmation that CORRECTED_DATA contains polarization solutions for the target fields, and the forward hand-off for /project:image with stokes='IQUV'.