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

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) Acceptance @ SLAC (Kevin, Sandrine, and/or Travis) Integration & Verification in Tucson (James)

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

Shutter Test with CCS (end of 2017?) Schedule Summary Cryostat @ 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?)

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

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

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

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

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

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.

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

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

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)

Integration and Test in Tucson

Integration and Test in Tucson

Back-up Slides

Interfaces

ComCam on Telescope to Facilitate Hardware Interface Testing CCS CRYOSTAT

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.

Detector Raft & FOV Field of View Single raft

ComCam Optical Design

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

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

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

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

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.

Mounted to the Integrating Structure

Section View of ComCam Installed

Interfaces