1. DECam & NOAO/CTIO Tim Abbott DES Collaboration Meeting Rio de Janeiro, May 2009 Tim Abbott, DES Collab. mtg., Rio, May 2009

2. NOAO Roles NOAO has multiple roles in the DES project: 1.It is the provider of the Blanco telescope and the observing time required in order to carry out the DES 2.It is the customer - DECam will be a facility instrument 3.It is a full DES collaboration member 4.It is upgrading CTIO facilities for DECam (CFIP) 5.It is ensuring that the NOAO data transport system can handle DES and community data & that the network bandwidth will be sufficient 6.It is working with DESDM to ensure the Community Pipeline will slot into the NOAO E2E (telescope to archive) DM system 7.It is the lead for DECam installation and commissioning 8.It conducts DECam operations DES Directors Review April 28 2009 2

3. The CTIO Facility Improvement Project (CFIP) CFIP is summarized in the CFIP Project Execution Plan and more fully described in the CFIP Technical Design Report. The CFIP Project Manager is Tim Abbott. The tasks, to be completed prior to DECam delivery, are: 1. Upgrade the Telescope Control System (German Schumacher) 2. Definitively repair the Primary Mirror Radial Supports (Andres Montane) 3. Build a Clean Room adjacent to the telescope (Brooke Gregory) 4. Evaluate the Telescope Environmental Control System (Alistair Walker) 5. Install Utility and Cryogen lines for DECam (Gale Brehmer) DES Directors Review April 28 2009 3

4. CFIP - TCS 1.Upgrade the Telescope Control System (TCS). The new system will be compatible with that at the SOAR 4m and is a milestone on the development of the LSST TCS. The telescope encoders are replaced with modern, higher performing, and much simpler Heidenhein tape encoders. Simplified architecture, new hardware, LABView software. Wallace pointing kernel. Integrates all present instruments, plus NEWFIRM and DECam Short-distance slew time improved –Spec: 2° in 17sec (DECam r/o time), Goal: 3° in 20sec Unguided tracking performance improved Pointing expected to be improved DES Directors Review April 28 2009 4

5. TCS - schedule STATUS: All hardware purchased, encoders installed, commercial software packages purchased. April 2009 engineering run demonstrated full and stable open-loop control of the telescope and subsidiary systems (e.g. brakes), over the full range of speeds. July 2009 engineering run – close the servo loop, with production software August 2009 – finalize DECam protocols December 2009 – full product tests Jan – Feb 2010 – commissioning End Feb 2010 – Done! Summary – on track, looking good! DES Directors Review April 28 2009 5

6. TCS Upgrade Tim Abbott, DES Collab. mtg., Rio, May 2009

7. TCS upgrade, software status Completed packages: –Mount Software –Serial Software –SMC Control –Instrument Interfaces Packages awaiting testing: –TCS Application –Dome Utility –Operator GUI Packages to start Aug 2009: –Guider interfaces –Facility Database 7 DES Directors Review April 28 2009

8. CFIP – radial supports 2. Modify the primary mirror radial (edge) support system to prevent separation of the supports from the mirror. Separation at the glued interface between the edge supports and the primary mirror has been a recurring fault since the telescope was built. STATUS: Underway during engineering shutdown April 13 – May 28, see: Blanco interior view DES Directors Review April 28 2009 8

9. CFIP – clean room 3. Build a clean room adjacent to the telescope – for use by DECam and NEWFIRM STATUS: Design complete – we will use the “Coudé Room”. –June 15Final review –June 16 Order materials –July 7Assemble structure –July 21 Electrical installation –August 1 Install Filter Fan Units, lamps, humidifier DES Directors Review April 28 2009 9

10. Seismically resistant structural design, anchored to floor. DES Directors Review April 28 2009 Wall panels – static dissipative PVC Floor – Antistatic matting 50% Filter Fan Units ceiling coverage Use Coudé Room as plenum Positive pressure in Coudé Room Air-locked pass-through Controlled humidity - >35% 10

11. Tim Abbott, DES Collab. mtg., Rio, May 2009

13. CFIP – Blanco ECS 4. Evaluate the Environmental Control System STATUS: Underway –In-dome thermal and wind measurements Feb-April 2009 –Design new primary mirror chiller/extractor plenum, install in 2010. DES Directors Review April 28 2009 13

14. CFIP – cryo & utilities 5. Install Utility and Cryogen Lines to DECam STATUS: DECam-CTIO discussions continue, and design is well underway. DES Directors Review April 28 2009 14

15. Tim Abbott, DES Collab. mtg., Rio, May 2009 Shutdown, April/May 2009

16. Tim Abbott, DES Collab. mtg., Rio, May 2009

18. One unknown broken pad found. Total: 4 broken supports in 4.5 years. One More Broken Pad

19. Tim Abbott, DES Collab. mtg., Rio, May 2009 New supports installed using the old mount points as braces. A separate mounting jig for each supports 4 Invar pads.

20. Tim Abbott, DES Collab. mtg., Rio, May 2009 Repositioned H-bars equally spaced around the primary to a precision of ~0.3mm. Old H-bars were out of position by up to 2- 3mm. Positioning the H-bars

21. Tim Abbott, DES Collab. mtg., Rio, May 2009 All 96 pads epoxied at the same time. Epoxy injected through pad to ensure full coverage. Left 3 days to cure. Stress test – each pad loaded to maximum strain, no failures. Bonding the pads

22. Tim Abbott, DES Collab. mtg., Rio, May 2009 Mirror washed, reflectivity still adequate. Re-aluminizing chamber unreliable so recoating deferred to 2010. Washing the mirror

23. Tim Abbott, DES Collab. mtg., Rio, May 2009 Radial supports and sockets precisely adjusted according to original (verified) installation recipe. Radial supports all tuned to be precisely vertical, lubricated. Alignment

24. Also… H-bar knuckles machined down to increase tangential free play. Counterweights and lever arms trimmed to increase permissible flexure under gravity before contact made with cell. Counterweight trim weights refined. Developed and installed radial definition units Custom tooling designed & built for all stages. Tim Abbott, DES Collab. mtg., Rio, May 2009

25. Radial definition units. Installed system of 4 removable radial constraints incorporating tuned system of Belleville washers and strain gauges. Tim Abbott, DES Collab. mtg., Rio, May 2009

26. Significant defect (devitrified glass and crack) ground out and passivated with HF.

27. Tim Abbott, DES Collab. mtg., Rio, May 2009 Telescope reassembled, driven around the sky, on-sky optical tests now under way.

28. So far, so good… Tim Abbott, DES Collab. mtg., Rio, May 2009

29. So far, so good… Tim Abbott, DES Collab. mtg., Rio, May 2009

30. NOAO and Integration, Installation & Commissioning Integration = Assembling DECam “on the floor”, testing software, pipelines etc. Includes testing the community pipeline and the data transport system Installation = DECam onto the Blanco telescope –A set of tasks and procedures that culminates in DECam being assessed as being ready to proceed to commissioning –Includes end to end tests of the data system –A conservative linear mapping of the tasks involved comes to 50 days –Starting July 20 2009, the schedule and procedures will be examined in detail, and hardened –Finalized before next Directors Review, nominally November 2009 –Leader – Tim Abbott, Blanco Telescope Scientist Commissioning = On sky tests, full end to end, photons into the telescope, science out at NCSA and NOAO. –A strawman plan that has been around for three years shows two commissioning periods of 2-3 weeks each, with a break between, followed by a Science Verification period. –This plan will be firmed-up (Sept-Nov 2009) –Leader – Alistair Walker, DECam Instrument Scientist DES Directors Review April 28 2009 30

31. NOAO and Operations Detailed Operations planning will begin in late 2009 and continue through 2010. –DES operations will be merged with “normal” operations for NOAO and Chilean astronomers. –The telescope observing schedule is prepared for a semester at a time. DES will be part of the process. –Operational procedures - e.g. filter changing, F/8 mirror changing – provision of the ability to safely and efficient carry out such procedures is an integral part of the DECam Project. DES Directors Review April 28 2009 31

32. Tim Abbott, DES Collab. mtg., Rio, May 2009

33. Cleanroom – Extras Tim Abbott, DES Collab. mtg., Rio, May 2009

34. Constructional details Anti-seismic frame – steel roof and corner pillars Panels – dissipative PVC; aluminum frames; stainless stripping Seals Vents – low level slots with self-adjusting covers and magnetic sealing strips. Doors – –2 large instrument access –Air-locked gowning area –Air-locked pass-through for tools, etc. –(Possible emergency crash exit opposite gowning area?) Floor – dissipative matting

35. Flooring Requirements: –ESD safe –Clean(able) –Load-resistant Solution chosen: –StaticWorkx: 3mm, solid vinyl tile over grouted concrete –ESD characteristic: ANSI ESDS 20.20 standard –Load – 2500 lbs/sq.in. –Steel Transition ramp –Installed by AOSS in cleanroom structure

36. Fabrication and Assembly Welded steel modules prefabbed by contractor: pillars and roof Modules brought to Coude Panel vents pre-cut Cable trays incorporated in roof sections –Cabling of roof done in Coude on floor Pillars cemented to floor, joined to roof sections (bolted joints); Roof installed on pillars FFUs, lamps, installed on roof and connected to cables Panels, fixed and on doors, installed

37. ESD Management Room construction –Panels – static dissipative PVC –Floor – static dissipative rubber/vinyl {TBD} Humidity – automatic control Station tooling (TBD) ionizers, table mats, grounding lines, monitors

38. Operations Model Normally off: vents will be sealed, doors locked, ventilators and humidifier will be off. Coude will be at positive pressure (this is new). A fan/filter inlet will be constantly acting. (periodic filter maintenance). For cleanroom use, depending on nature of use: –Un-lock necessary doors –Un-block vents –Turn on FFUs and lamps and dust monitors –Possible wipe down of room –Turn on humidifier and space heaters (if required) –Wait until dust-counter reading has settled to a steady state

39. Operations model Other uses of coude (potential conflicts with ideal practice): Instrument storage Staging are for telescope work (e.g. re-aluminzation) Off-telescope testing of instruments: –NEWFIRM –DECam camera

40. SDM – extras Tim Abbott, DES Collab. mtg., Rio, May 2009

41. Data Transport System & Network Bandwidth NOAO Data Transport System - handles data from many telescopes on two continents and three mountain tops. Data flows into the NOAO Science Archive (NSA). DES data will also be routed to NCSA. Network - Cerro Tololo to La Serena –Private 155 Mb/s microwave link - (x 2) –Eventually replaced with “LSST fiber” Network - La Serena to NCSA –Present route is to Miami via Brazil –Internet2, presently 40 Mb/s, Commodity 15 MB/s –155 Mb/s is available now, Gb pipes soon. –Tests are planned (June, August) with full 155 Mb/s pipe from Tololo to NCSA –An upgrade to give more DECam headroom is needed, likely to ~ 80 Mb/s Internet2 DES Directors Review April 28 2009 41

42. NOAO and the DESDM Community Pipeline DES observations will follow a standard protocol, using SDSS g,r,i,z, and Y filters. The data will be processed by the DES pipeline. NOAO and Chile community users will use these and extra filters, and will have calibration frames usually but not always taken during the period of their observations. There will be a wider variety of exposure times, dither patterns, etc. The Community Pipeline (a DES deliverable) will process these data, assuming they are taken in a “reasonable” way, and place the results In the NOAO Science Archive. NOAO will be responsible for the distribution of both DES and community data, respecting any proprietary period. DES Directors Review April 28 2009 42

43. DES Directors Review April 28 2009 The NOAO Science Data Management (SDM) Program The Data Products Program (DPP) preceded SDM : – NOAO created DPP in 2002 to develop and distribute astronomical archival content for the NOAO and the NVO. – The NOAO Archive was developed – initially to host and serve NOAO survey products http://archive.noao.edu/nsahttp://archive.noao.edu/nsa In FY 2009, the Science Data Management (SDM) Program was created to re-scope DPP's broad original mission. The Science Data Management has a revised mission to serve the specific and immediate data management needs of NOAO. Betty Stobie is the SDM Interim Head of Program, and Chris Miller is the Program Scientist. SDM will deploy and then operate the DESDM-supplied Community Pipeline SDM will support DES by operating the Data Transport System 43

44. DES Directors Review April 28 2009 The SDM Mandates Data Management Systems Operations (SDM-O)‏ – Raw data capture and storage for all current NOAO telescopes – Wide-field imager data processing for NOAO 4m telescopes – Operation of the existing NOAO Archive for raw and reduced data retrieval in preparation for DECam Data Management Systems Development (SDM-D)‏ – System and archive development for DECam – Operation of the DECam Community Pipeline Science User Support and Applications – Data Handbook updates, Data Dictionaries, NEWFIRM cookbook – Help Desk management – Legacy IRAF support including release and platform support – Applications support for DECam 44

45. DES Directors Review April 28 2009 SDM 2009/2010 Deliverables 45