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3 Gpix Camera

3 Gpix Camera. Camera DAQ/Control System SLAC Program Review T. Schalk CCS team. LSST Control Systems. Observatory Control System. Time Date Distribution. Target/Mode Request/Ack. to/from scheduler. Primary Command Bus. Facility Database. Camera Control System. Telescope

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3 Gpix Camera

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  1. 3 Gpix Camera Camera DAQ/Control System SLAC Program Review T. Schalk CCS team SLAC June 7 2006

  2. LSST Control Systems Observatory Control System Time \ Date Distribution Target/Mode Request/Ack. to/from scheduler Primary Command Bus Facility Database Camera Control System Telescope Control System Aux. Equip. / Calibration Control System Data Mgmt. Control System Status/Data Bus Status Data Bus Data transport Scheduling activities within camera SLAC June 7 2006

  3. Camera Assembly Utility Trunk Cold Plates BEE Module Cryostat outer cylinder Focal Plane fast actuators Raft Tower (Raft with Sensors + FEE) L3 Lens in Cryostat front-end flange Filter Changer rail paths Shutter L1/L2 Housing Camera Base Ring Filter Carousel main bearing Filter in stored location L1 Lens Camera Housing L2 Lens Filter in light path SLAC June 7 2006

  4. The LSST Focal Plane 3.5 deg FOV Guider Sensors (yellow) Wavefront Sensors (red) 3.2 Gpixels Illumination Limit SLAC June 7 2006

  5. Science Data acquisition begins here Read Out from CCD (16*2 *9 ccd’s = 288 a to d’s) Full CCD showing segmentation. SLAC June 7 2006

  6. Control is distributed to the local subsystem level where possible, with time critical loops closed at the local level. Subsystem control imbedded in subsystem and communicates with CCS Master/Slave protocol. One camera control system (CCS) module (CCM) is the master and responsible for scheduling tasks and communication with the OCS Coordination via messages between the CCS and its subsystems. No direct subsystem to subsystem communication. Publish/subscribe model. Separate Command Control Bus and data buses. Extensive logging capabilities. Assume need to support engineering and maintenance modes Accommodations made for test-stand(s) support. Design strategy for this system SLAC June 7 2006

  7. Camera Control Architecture Camera buses Auxiliary systems Camera Body Cryostat Thermal (T5U) Thermal (T3U,T4U) Science DAQ (SDS) Science array (SAS) Vacuum (VCS) Shutter (SCU) WF DAQ (WDS) Wave Front (WFS) Filters (FCS) Guide Analysis (GAS) Guide array (GSS) Power/Signal (PSU) Lens (L2U) FP actuation (FPU) Thermal (T1U,T2U) Raft Alignment (RAS) Command Status Control Room Camera Control (CCS) Observatory buses SLAC June 7 2006

  8. OCS CCS FCS SAS SDS DM Subsystems mapping to Managers Every arrow has an interface at each end. Command Response Red means it’s a CCS group responsibility. Subsystem managers Data Similar for TSS, RAS, SCU, VCS, and L2U Similar for WFS/WDS and GSS/GAS (see next slide) Subsystems that produce data. Subsystems that do not produce data (only status info). SLAC June 7 2006

  9. CCD transport Design assumptions • — The camera’s data are carried on 25 (21?) optical fibers (one per raft) • — Data are delivered by the camera to the SDS in 2 seconds. • — These fibers carry only data • — Data flows only from camera to SDS on these fibers (half duplex) • — The fiber protocol is TBD • — The data rate from a (fully populated) raft is 281.25 Mbytes/sec • (2.25 Gbits/sec) • — Total aggregate data (201 CCDs) output rate is 6.432 Gbytes/sec • — Data must be carried from camera and delivered to its client (software) interface with a latency of not more then one (1) second. • — Interfaces define commodity networking as a MAC layer => trade study SLAC June 7 2006

  10. Camera specific => Standard I/O CDS Architecture SLAC June 7 2006

  11. First detailed designs are for DAQ SLAC June 7 2006

  12. RNA Hardware layout a pizza box SLAC June 7 2006

  13. Simultaneous DMA to memory for speed SLAC June 7 2006

  14. The data archive will grow at a rate of roughly 7 PB/yr. Infrastructure Layer Long-Haul Communications Base to Archive and Archive to Data Centers Networks are 10 gigabits/second protected clear channel fiber optics, with protocols optimized for bulk data transfer Archive/Data Access Centers In the United States. Nightly Data Pipelines and Data Products and the Science Data Archive are hosted here. Supercomputers capable of 60 teraflops provide analytical processing, re-processing, and community data access via Virtual Observatory interfaces to a 7 petabytes/year archive. Mountain Site In Chile Data acquisition from the Camera Subsystem and the Observatory Control System, with read-out in 2 seconds and data transfer to the Base at 10 gigabits/second. Base Facility In Chile,.Nightly Data Pipelines and Products are hosted here on 25 teraflops class supercomputers to provide primary data reduction and transient alert generation in under 60 seconds. SLAC June 7 2006

  15. Application Layer Data Acquisition Infrastructure Image Processing Pipeline Detection Pipeline Association Pipeline Moving Object Pipeline Eng/Fac Data Archive Common Pipeline Components 2.5.1.1 Nightly Pipelines and Data Products Nightly Pipelines are executed and Data Products are produced within 60 seconds of the second exposure of each visit. Alert Archive Calibration Pipeline Classification Pipeline Image Archive Source Catalog Object Catalog Alert Processing Deep Detect Pipeline 2.5.1.2 Science Data Archive These pipelines are executed on a slower cadence and the corresponding data products are those that require extensive computation and many observations for their production. End User Tools Deep Object Catalog VO Compliant Interface Middleware SLAC June 7 2006

  16. Data Management Organization • Team is headquartered at LSST Corporation, Tucson • Project Manager, Project Scientist, Software Engineers • R&D Team is creating the MREFC, DOE proposals • Construction Team will be a Tucson-based management/functional team, with a small number of single-location outsourced implementation teams (e.g. NCSA, IPAC) SLAC June 7 2006

  17. SLAC June 7 2006

  18. CCS camera control system CCM camera control master/module OCS Observatory control system TCS telescope control system DM LSST data manage system SAS Science array system SDS Science array DAQ system RNA Raft network adapter SCU Sample Correction Unit WFS Wave front system WDS Wave front data system GSS Guide sensor system GAS Guide sensor Acquisition system DSP digital signal processor FPU Focal Plane actuation TSS thermal control system RAS Raft alignment system SCU Shutter control system FCS Filter control system VCS vacuum control system L2U L2 actuation system UML Unified Modeling Language MAC layer medium access control (MAC) Layer, which provides a variety of functions that support the operation of local area networking FPGA Field-Programmable Gate Array DMA direct memory access MGT Multi-Gigabit Transceivers IBA InfiniBand Architecture SDR single data rate ACRONYMS !! SLAC June 7 2006

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