1. Commissioning Camera Breakout Session Joint Technical Meeting 2017 Mar 6-8

2. Agenda
ComCam planning and scheduling (James & Jacques)
CCS & CCS-TCS Interface (Tony)
Software to use ComCam
Software to get data out of ComCam (Mike)
Go through ICD list (James)
Hardware needed by software (Paul)(and/or at Guider Breakout?)
Differences in Interfaces (Te-Wei)
Utilities (Travis)
Cryostat (Justine/Travis)
SLAC (Kevin, Sandrine, and/or Travis)
Integration & Verification in Tucson (James)

3. A joint project between the Camera and T&S Teams
Planning & Scheduling
Responsibilities
THERMAL BOX FROM CAMERA ?
A joint project between the Camera and T&S Teams
Camera Team will provide a cryostat containing a single Camera raft (9 CCDs) and associated hardware
T&S will provide
3 element corrector
Filter changer with 3 filters
Total of 6 filters that match the LSST passbands
Shutter
The mechanical interface to the telescope
User is Commissioning Team

4. Shutter Test with CCS (end of 2017?)
Schedule Summary
SLAC
Filter Substrates Completed
Filter Coatings Started
Cryostat in Tucson in October 2018
Corrector Assembly and Test
Lenses Procurement
Lenses Delivery
ComCam Assembly and Test
6 months buffer
ComCam in Chile in July 2019
Shutter Test with CCS (end of 2017?)
Filter Changer Test with CCS (beginning of 2018?)

5. Schedule COMCAM DOE PDR REVIEW – May/June 2017
COMCAM OPTICS RFP OUT – Optics due before end of 2017
COMCAM FILTERS in FABRICATION – due ~ end of 2017
COMCAM FILTER CHANGER – due Mar 2018

6. Schedule COMCAM FILTER CHANGER – due Mar 2018
COMCAM SHUTTER ORDERED – Due before end of 2017
Section To be updated

7. CCS & CCS Interface (Tony)
Software to use ComCam
Software to get data out of ComCam (Mike)

8. Interfaces
To the greatest extent practicable, the Commissioning Camera and its associated operations are designed to rely upon, and to exercise, the system interfaces of the final LSST design.
Utilities: Use a subset of what the full Camera uses, and nothing* else.
Mechanical: Mount ComCam to a Camera Mass Simulator that mimics the envelope, mass, and center of gravity of the full Camera.
Software: Interface with TCS & OCS, some differences due to different wavefront sensing.
Data

9. Software Interface Testing
Science Sensor Readout and Transfer Interface (LSE-69: DAQ-DM)
Wavefront Sensor Readout and Transfer Interface (LSE-67: DAQ-TCS)
Guider Sensor Readout and Transfer Interface (LSE-66: DAQ-TCS)
Camera Supervisory Control Interface (LSE-71: OCS-CCS and LSE-72: OCS-DM)
DM Pipelines
ComCam on Telescope
Images
ComCam Front End Corrector
Data Acquisition System (DAQ)
Telescope Control System (TCS)
ComCam Cryostat
Guider
WFS
Data
ComCam Utility Box
Camera Control System (CCS)
Observatory Control System (OCS)
Summit Computer Room

10. What interface details are needed for the DOE Comcam PDR?
Cryostat to L3
Cryostat mechanical to camera mass simulator
Utility trunk mechanical to camera mass simulator
Utilities to telescope: LSE-64, ___
Filter and shutter control electronics to Thermal Utility Box
CCS to Filter Changer and Shutter (very basic, ~1 page of text)
CCS to OCS: LSE-71
CCS to TCS Guider: LSE-66
CCS to TCS Wavefront Interface: LSE-67
Camera and DAQ (&clients? TBD), DAQ to DM: LSE-68
OCS-Telescope Software Communication Interface: LSE-73
Discussion on the LSE documents about whether it is easier to update existing documents with ComCam specific information, or make a separate overall document that points out the differences in ComCam, but refers to the LSE documents for everything else.  The latter is probably easier.

11. Agenda Continued
Hardware needed by software (Paul)(and/or at Guider Breakout?)
Differences in Interfaces (Te-Wei)
Utilities (Travis)
Cryostat (Justine/Travis)
SLAC (Kevin, Sandrine, and/or Travis)

12. Integration and Test before Shipping to Chile
SLAC will ship the Cryostat to Tucson in October 2018
Integration of Cryostat with Front End Corrector
Integration of Utility Box
Verification of Hardware and Software Interfaces
Functional Tests under Software Control
ComCam ships to Chile in July 2019
Tests will be repeated in Chile
Utility Box

13. Functional Tests include Software Control and Data Acquisition similar to LSST Science Camera
Camera Control System (CCS) to control ComCam
Data Acquisition System (DAQ) to acquire image data from the CCD raft
Observatory Control System (OCS) for Engineering Facility Database Telemetry (EFD) and Control (Command to CCS)
Telescope Control System (TCS) for testing of Guider and Wavefront Interface and local data archive
ComCam
ComCam Front End Corrector
ComCam Cryostat
Guider Interface
Wavefront Interface
Data Storage
Data
ComCam Utility Box
Observatory Control System (OCS)
Telescope Control System (TCS)
EFD
Controls
Camera Control System (CCS)
Data Acquisition System (DAQ)

14. Integration and Test in Tucson

15. Integration and Test in Tucson

16. Back-up Slides

17. Interfaces

18. ComCam on Telescope to Facilitate Hardware Interface Testing
CCS
CRYOSTAT

19. Purpose
A single raft camera to facilitate testing and verification of system interfaces
Initial on-sky testing of the telescope
obtain representative images for both engineering and science verification purposes
Testing and calibration of Data Management algorithms prior to the delivery of the Camera
Promote early integration, verification and shakedown of the interfaces and interactions between the three primary LSST subsystems: telescope, camera and data analysis software.

20. Detector Raft & FOV
Field of View
Single raft

21. ComCam Optical Design

22. Alignment Retroreflectors
Section View
Alignment Retroreflectors
Cryostat L3
Filter L2 L1
Detector

23. Corrector lenses have spherical surfaces front and back
Fabricated from fused silica
Magnesium fluoride anti-reflection coatings
Design is complete
Conceptual design of the L1-L2 housing complete
Currently awaiting bids

24. ComCam
L3 doubles as the cryostat window, so a stress and deflection analysis was performed. It concluded the window can used as designed.
Max deflection: 57 µm along the optical axis
Tolerance: 600 µm
Max principal stress: 7 MPa (~1000 psi), located in the center of the inner (vacuum side) surface of L3
Factor of safety of 7.5 wrt the modulus of rupture
Factor of safety of 7.7 wrt the tensile strength

25. Cover (other cover removed for clarity)
ComCam Filter Changer
Housing
Filter substrates were completed by Sydor, and are currently awaiting coating at Materion.
Filters (Ø265 mm flats)
Cover (other cover removed for clarity)
Linear Slide

26. 200 mm aperture shutter built for the PEPSI spectrograph on the LBT
ComCam Shutter
-Ordered from Bonn Shutter, delivery August 2017 at the latest
-Semi-custom moving slit type with 236 mm aperture
-Minimum exposure < 1ms
-Programmable blade trajectory
200 mm aperture shutter built for the PEPSI spectrograph on the LBT
Bonn has already made the carbon fiber blades.

27. Mounted to the Integrating Structure

28. Section View of ComCam Installed

29. Interfaces