A Work Breakdown Structure (WBS) is a tool used by project management and systems engineering to decompose a project into manageable components. It is typically organized into a hierarchical tree structure with clearly defined objectives and responsibilities.
The original Solidworks ePDM Vault SysDoc folder was organized around this structure. For example, the GIS is part of the high-level controls, WBS 4.5, so is found in the vault under DKIST File Vault > SysDocs > 4.0 Controls > 4.5 GIS.
The WBS may not necessarily correspond to how you are used to thinking about the various systems and subsystems. For example, the telescope mount and Coudé rotator are subassemblies of the telescope assembly. The M1 is a subassembly of the telescope mount although we often think of the M1 and the Coudé rotator as separate systems.
WBS 1.0 Telescope Assembly
The Telescope Assembly WBS element encompasses the telescope mount assembly, the M1 assembly, the Top End Optical Assembly (TEOA), the Feed Optics assemblies, the System Alignment equipment, and the Acquisition System.
1.1 Telescope Mount Assembly
The Telescope Mount Assembly (TMA) WBS element encompasses the large structure that supports the optics and instruments of DKIST. It includes all the various mechanical subassemblies, bearings, controllers, drives, and equipment that are used to point, track, and slew these optics and instruments during science operations.
1.1.1 Mount Structure
The mount structure is comprised of all the major structural elements that provide support and rotation of the mirror assemblies and related instrumentation packages in azimuth and altitude. The mount is comprised of the optics support structure assembly, the mount base assembly, the azimuth track, the azimuth and altitude bearing systems, the mount access platforms, and the light baffle tube.
1.1.2 Mount Drive System
The mount drive system is comprised of the drives, amplifiers, encoders, brakes, over-travel stops, servo controllers, and other equipment used to point, track, and slew the mount in azimuth and altitude rotation.
1.1.3 Coudé Rotator Structure
The Coudé Rotator Structure is the large, single-level steel assembly that rotates about an azimuth axis inside of the Pier. It is comprised of the structural elements that support Coudé instruments and optical benches underneath the mount, the bearings that allow for rotation, and also the flooring system.
1.1.4 Coudé Rotator Drive System
The Coudé rotator drive system is the assembly of drives, encoders and controllers that allow the coudé rotator to track and de-rotate the light feed from the mount, align slits of spectrographs, and to slew to different positions during normal telescope operations.
1.1.5 (Intentionally blank)
1.1.6 (Intentionally blank)
1.1.7 Ancillary Mechanical Equipment
The ancillary mechanical equipment is the collection of secondary equipment that is bolted to the mount and Coudé rotator structures (e.g., mirror cover, cable wraps, etc.)
1.1.8 Mount Control System
The mount control system (MCS) is the system responsible for the control and coordination of the TMA, including the mount drive system, the coudé rotator drive system, and the Nasmyth rotator drive system. It also controls the ancillary mechanical equipment, and provides interfaces for all these components to the telescope control system (TCS), the observatory control system (OCS), and the global interlock system (GIS).
1.1.9 Telescope Mount Assembly GIS Interface
The portion of the GIS associated with the TMA is distributed in two separate local interlock controllers. These LICs communicate through the safety network which is part of the GIS. These individual LICs function as independent safety systems as well as globally communicate within the GIS, providing for equipment and personnel safety.
1.1.10 (Intentionally blank)
1.1.11 Telescope Mount Assembly Tools & Equipment
The TMA tools and equipment include specialty items required to install, align, and test the TMA in the factory and on-site. These include such things as dummy weights, precision measurement equipment, hydraulic bolt tensioners, lifting equipment, slings, come-alongs, and other "install and align" type items.
1.2 M1 Assembly
The M1 Assembly contains the M1 (primary) mirror and the M1 support system that controls its optical figure over the telescope operating conditions.
1.2.1 M1 Mirror
The M1 Mirror is the primary light-collecting mirror in DKIST.
1.2.1.1 M1 Mirror Blank
The M1 mirror blank is made of highly homogeneous low-expansion glass ceramic material with a machine-generated front and back surface ready for optical polishing and figuring.
1.2.1.2 M1 Mirror Grind, Polish, Ship
The contracted effort, beginning with the delivery of the M1 mirror blank, consisting of the generation, polishing and transport of the finished M1 Mirror to the site.
1.2.2 M1 Cell Assembly
The assembly containing the M1 mirror, M1 support system, M1 thermal control system, cooled aperture plate and M1 control system
WBS 2.0 Wavefront Correction
The wavefront correction system is comprised of two major elements: the adaptive optics (AO) system, and the active optics (aO) systems. Both AO and aO are part of the Wavefront Correction – Coudé (WFC-C). Also included in this subsystem are the Wavefront Correction Control System (WCCS), and the Wavefront Correction Limb Tracker.
WBS 3.0 Instrument Systems
Instrument Systems is comprised of the Instrument Lab Facility (ILF), a Visible Broadband Imager (VBI), Visible Spectro-Polarimeter (ViSP), Near-IR Spectro-Polarimeter (NIRSP), Visible Tunable Filter (VTF), and Camera Systems.
WBS 4.0 High Level Controls and Software
The High Level Controls and Software WBS element encompasses the means to control and coordinate observations performed with the telescope and instruments. This includes the lowest level servo or logic controller to the highest-level queue and scheduling processes.
4.1 Common Services
The Common Services provides software infrastructure required by all DKIST software systems.
4.2 Observatory Control System (OCS)
The OCS operates the observatory by creating and coordinating observations sent to the other systems. The OCS provides user interfaces, planning and scheduling, and observation management tools.
4.3 Data Handling System (DHS)
The DHS manages input data streams from the instruments. It provides the data flow mechanisms, data storage, archival, and retrieval, and data display.
4.4 Telescope Control System (TCS)
The TCS is responsible for the control of the telescope positioning and image quality. It operates associated subsystems, including the enclosure, mount, M1, M2, acquisition and guiding, and adaptive/active optics.
4.5 Global Interlock System (GIS)
The GIS provides a redundant, stand-alone safety mechanism for personnel and equipment.
WBS 5.0 Enclosure
The Enclosure is the large structure that surrounds and provides protection for the Telescope Assembly. It includes a variety of mechanical subassemblies, bogies, controllers, drives, and equipment that are used to point, track, and slew it in synch with the Telescope.
WBS 6.0 Support Facilities and Buildings
The Support Facilities and Buildings include Construction Services, Buildings, Facility Equipment, Coating and Cleaning Facilities, Handling Equipment, Interconnects and Services, and Facility Thermal Systems (FTS).
WBS 7.0 Remote Operations Building (ROB)
The elements of the ROB include the Building Lease and Building Outfitting.