nenucal#

nenucal is a calibration and data-management toolkit for NenuFAR radio observations. It was developed for the Cosmic Dawn project but is not specific to it — it can be used for any NenuFAR imaging observation.

At its core it provides three things:

  • a data management tool (nenudata) to organise observations, spectral windows, and node layout across the cluster, and to move data between processing stages;

  • a calibration pipeline (calpipe), running on top of DP3 and driven by TOML configuration files;

  • a set of utilities to handle the supporting data products — gain solution tables (soltool), sky models (modeltool), flagging (flagtool), MeasurementSets (mstool), and imaging (imgpipe).

nenucal is designed to be composed into full end-to-end pipelines rather than run on its own. For the Cosmic Dawn project it is used in two such pipelines, both general enough to be reused by any NenuFAR project:

  • nenuprepipe — pre-processing of raw NenuFAR data (L1) into quality-checked MeasurementSets ready for calibration (L2);

  • nenuflow — the direction-dependent calibration pipeline.