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We provide a detailed description of the Chimera code, a code developed tomodel core collapse supernovae in multiple spatial dimensions. The corecollapse supernova explosion mechanism remains the subject of intense research.Progress to date demonstrates that it involves a complex interplay of neutrinoproduction, transport, and interaction in the stellar core, three-dimensionalstellar core fluid dynamics and its associated instabilities, nuclear burning,and the foundational physics of the neutrino-stellar core weak interactions andthe equations of state of all stellar core constituents -particularly, thenuclear equation of state associated with nucleons, both free and bound innuclei. Chimera, by incorporating detailed neutrino transport, realisticneutrino-matter interactions, three-dimensional hydrodynamics, realisticnuclear, leptonic, and photonic equations of state, and a nuclear reactionnetwork, along with other refinements, can be used to study the role ofneutrino radiation, hydrodynamic instabilities, and a variety of input physicsin the explosion mechanism itself. It can also be used to compute observablessuch as neutrino signatures, gravitational radiation, and the products ofnucleosynthesis associated with core collapse supernovae. The code containsmodules for neutrino transport, multidimensional compressible hydrodynamics,nuclear reactions, a variety of neutrino interactions, equations of state, andmodules to provide data for post-processing observables such as the products ofnucleosynthesis, and gravitational radiation. Chimera is an evolving code,being updated periodically with improved input physics and numericalrefinements. We detail here the current version of the code, from which futureimprovements will stem, which can in turn be described as needed in futurepublications.

Chimera: A massively parallel code for core-collapse supernova simulation