Design and construction update on the Thirty Meter Telescope executive software system

The Thirty Meter Telescope (TMT) is a massive international undertaking with a myriad of software packages delivered by partners around the world. The Executive Software (ESW) package is the part of the TMT software system that is responsible for providing unified high-level control of observatory operations. It consists of five parts: a) a Sequencer Component that can be tailored to various sequencing needs by the loading of custom “scripts”, written in a TMT sequencing Domain Specific Language (DSL); b) a collection of these sequencing scripts used for critical observing tasks such as acquisition; c) user interface (UI) infrastructure that provides browser-based UI standards and access to TMT components and services; d) the set of UIs that observatory staff will use during operations to conduct TMT activities such as observing; and e) tools that assist in the visualization of observation data for quality assurance. In this paper, we describe the design of ESW, and give an update on the current status of the package, which is currently under construction.