The TolTEC Data Analysis Pipeline and Software Stack

TolTEC is a new camera at the Large Millimeter Telescope (LMT) that is currently under commissioning and will be in science operation starting 2023 spring. It provides simultaneous, polarization-sensitive imaging at wavelengths of 1.1, 1.4 and 2.0 mm through its 7718 Lumped element Kinetic Inductance Detectors (KIDs). The TolTEC data analysis software stack, TolTECA, has been developed to facilitate the data handling tasks ranging from KIDs data modeling to science data reduction, producing science-ready data products for both the TolTEC legacy surveys and for the principal investigator projects. The software stack consists of a high performance fully parallelized C++ data reduction pipeline engine citlali, and an infrastructural Python package tolteca, which works at the highest level. Some notable features include data product management, a web-based data visualization framework, timely analysis and quick-look tools for on-site observing, etc. While the citlali reduction engine implements the "naive" mapmaker, two types of existing maximum-likelihood mapmakers (TOAST from CMB-S4 and Minkasi from MUSTANG-2) are being integrated as part of the reduction work flow in tolteca, which produce better maps for observations of extended emissions. The tolteca also includes a TolTEC observation simulator, which plays a central role in characterizing the instrument and verifying/benchmarking the data reduction pipeline. The observation simulator also helps explore the science capability of the TolTEC, and facilitate the planning of TolTEC observations for both commissioning and science operation.