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Scientific and engineering requirements are the backbone of how the LBNF/DUNE project gets built to achieve DUNE's scientific goals. The structure is hierarchical. The Global science objectives (highest level) flow down to, i.e., drive, the Global science requirements; which in turn flow down through the scientific and engineering requirements for the detector on the one hand, and to the cryo and conventional facilities that support it, on the other.
Hierarchy The diagram at top-right shows the
Scientific and engineering requirements traceback (note direction of arrows; opposite of "flow down") on the Far Site branch of the projects. Traceback runs from
Far Site CF at the bottom, up through the elements that drive its requirements: the
Cryogenics systems and the requirements that all
FD modules must satisfy. These generic module requirements in turn depend on the Far Detector requirements. The overall
Far Detector requirements depend on the science requirements.
The individual FD subsystem requirements will trace back through the generic module requirements, and so on.
The second diagram at right shows the structure for the Near site branch of LBNF/DUNE.
Programmatic requirements are the backbone of how the LBNF/DUNE projects operate. They include project management operational requirements, means and methods requirements and major assumptions used by LBNF and DUNE.
Conceptual design of the LBNF/DUNE experiment established a baseline set of Parameters for the LBNF Beamline and the DUNE Near Detector and Far Detector.