Hawaii Earthquake Oct Gemini Recovery Planning and Execution. Prepared By: Rolando Rogers

Transcription

1 Hawaii Earthquake Oct Gemini Recovery Planning and Execution Prepared By: Rolando Rogers

2 Initial Set of Actions On Sunday directorate decided to close the telescope for night work till complete system checkout. The following day, using the initial information provided by Steve and John, an earthquake recovery team was organized.

3 Organization of the Recovery Team (1) Team Leader: Rolando Rogers (Electronics & Instrumentation Group Manager) Define a group of engineers and technicians from different disciplines to work in the recovery tasks: Civil, Mechanical, Optical, Electrical, Network, Instrumentation, and Electronics. In total around 20 persons. Organize personnel in sub-groups to tackle different sub-systems and tasks. Prepare a comprehensive list of sub- systems to inspect and check. Special consideration to Safety.

4 Organization of the Recovery Team (2) Only the Team Leader could authorize putting in service any subsystem. Team Leader was the single point of contact for communication to directorate, science staff, and rest of engineering team. Organize daily coordination meeting (in the morning) with the recovery team to check activities for the day. Organize a daily meeting (at 4 pm) to report to the rest of the staff about progress. Circulate Daily Progress Report to all Gemini staff.

5 Gemini-North Post Earthquake Check List and Report Updated October Activity Responsible Report Date 1.0 Building Infrastructure SH 1.1 Building itself In general is ok. Shear type of action in the dome isolation foam 16-Oct 1.2 Elevator Initial Inspection ok. Contacted Elevator Contractor and elevator released for use 16-Oct 1.3 Structural Inspection of Dome from outside SH Inspection ok. 17-Oct 2.0 Piping CC 2.1 Glycol Circuit Fully inspected ok 16-Oct 2.2 Oil Circuit for HBS Fully inspected ok 16-Oct 3.0 Cooling system SH 3.1 Chillers Chiller 1 and 2 inspected. Chiller 1 failed. Chiller 2 is on and w orking nicely but it w ill be left off for tonight. 16-Oct Chiller 1 now w orking ok, problem w as a possible short circuit due to moisture. Chiller 1 and 2 are now running ok. 17-Oct 3.2 Exhaust Fans EF1 ready to be pow er up. EF2 have some issues 16-Oct EF2 now working ok. Found problem w ith a digital I/O signal that made the plant room PLC to trip it. This feature w as disabled for the time being. Tested ok afterw ards 17-Oct 3.3 Repair of w ater pump This is maintenance issue that w as pending before the earthquake. Repaired done. Needs more checkouts. 20-Oct Repair w ork finished, including inspection. Working fine now. 21-Oct 4.0 Electrical Pow er PC 4.1 Plant Room UPS, generator, panels, etc. 16-Oct 4.2 Slip Rings 5th floor Initial inspection ok. Found some old problems that w ill need repair at certain point. 16-Oct 4.3 Other floors Inspection ok 16-Oct 5.0 Telescope Mount CC, RR 5.1 Azimuth Tape Encoders Gap in az heads not even. 16-Oct Azimuth heads back off for HBS testing. Tape encoder looks fine, no visible Sample of the document used damage. 17-Oct Azimuth heads w ere put back. Pending alignment check. 18-Oct While moving telescope in azimuth, w e see that the tape encoder follow s GIS absolute encoder quite w ell. Nevertheless w e still need to verify alignment. process. 19-Oct process. This This document document was was Head #1 and #2 checked w ith oscilloscope. The quadrature signals of head #2 looks good w ith a updated level of 8 v peak to peak, centered around 0 volts, and proper phase. Also updated on the reference mark on a looks ok daily at daily basis the position basis checked. Head #1 quadrature signals looks 23-Oct Sample of the document used during during the the earthquake earthquake recovery recovery

6 Overall Recovery Strategy In general the work was organized sequentially with the target of moving the telescope in elevation to properly check the M2 tip-tilt system at the horizon. This was the main branch of the scheduling. To achieve the above goal we had to check and repair (not in order): cooling systems, HBS, PCS, MCS, Elevation and azimuth cable wraps, air supply, electrical power, Cass rotator, A&G, instruments, etc. Whenever possible and depending in manpower availability we worked in parallel checking other non-telescope systems.

7 Outcome of Strategy Used On October 20 th, 5 days after earthquake, we were able to tilt the telescope to start checking M2 system. Except for M2 tip-tilt system, the telescope was ready to go on the sky on October 21 st, 6 days after earthquake.

8 Gemini-North Post Earthquake Check List and Report Updated October Activity Responsible Date 1.0 Building Infrastructure SH 1.1 Building itself 16-Oct 1.2 Elevator 16-Oct 1.3 Structural Inspection of Dome from outside SH 17-Oct 2.0 Piping CC 2.1 Glycol Circuit 16-Oct 2.2 Oil Circuit for HBS 16-Oct 3.0 Cooling system SH 3.1 Chillers 16-Oct 3.2 Exhaust Fans 16-Oct 3.3 Repair of w ater pump 20-Oct 4.0 Electrical Pow er PC 4.1 Plant Room 16-Oct 4.2 Slip Rings 5th floor 16-Oct 4.3 Other floors 16-Oct

9 5.0 Telescope Mount CC, RR 5.1 Azimuth Tape Encoders 16-Oct 5.2 Elevation Tape Encoders 16-Oct 5.2 Hydraulic Bearing Systems (HBS) 16-Oct 5.3 Az w rap 16-Oct 5.4 El w rap 16-Oct 5.5 Miscellaneous 16-Oct 5.6 Elevation Zenith-End-of-Travel sw itch needs adjustment 23-Oct 5.7 Test of telescope motion. 23-Oct 6.0 PCS SK, GG, PG 6.1 Oil circuit inside mirror cell 16-Oct 6.2 Glycol circuit inside mirror cell 16-Oct 6.3 Mirror Cover Inspection 19-Oct 6.4 Mirror Inspection 16-Oct 6.5 M1 Baffle 19-Oct 6.6 Control system 19-Oct 7.0 SCS Ccarter, PG 16-Oct 7.1 Tip tilt mechanisms inspection 18-Oct 7.2 Mirror Inspection PG 18-Oct 7.3 Secondary support structure (SSS) CC 20-Oct

10 8.0 Electronics JW 8.1 Thermal Enclosures in 5th floor 16-Oct 8.2 ECS Drives cabinets and cabling 16-Oct 9.0 Instrum ent JW 9.1 GMOS 16-Oct 9.2 Altair 16-Oct 9.3 GCAL 16-Oct 9.4 NIRI 16-Oct 9.5 Michelle 9.6 NIFS 10.0 OtherTelescope Systems 10.1 A&G JW, PG 16-Oct 10.2 CRCS 19-Oct 11.0 ECS SH 11.1 Dome bogie inspection 11.2 Top and Bottom shutter 17-Oct 11.3 Vent Gates 11.4 Cranes 17-Oct 12.0 Miscellaneous 12.1 Cherry Picker SH 16-Oct 12.2 Central Section and LSE SH, CC 18-Oct 12.3 Dome light covers 21-Oct 12.4 P1 alignment PG 19-Oct 13. Laser systems PG 13.1 Laser bench 17-Oct 13.2 BTO - BTOOB - LLT 20-Oct

11 List of System That Suffered Damage M2 Tip-Tilt system HBS (Hydraulic Bearing systems) Dome Azimuth Encoder System Shutters Azimuth over speed sensor Azimuth Wrap limit protection and position sensor Chiller 1

12 M2 Tip-tilt System Recovery From October 23th onwards our main task was to recover M2 tip-tilt system. The team leader for this task was Mike Sheehan (Deputy Chief Engineer). The M2 Tip-Tilt system was ready for use in November 10th, our first night on the sky after the earthquake. In summary: 26 nights were lost at Gemini North due to the Hawaii earthquake of October 15 th 2006.

13 Key to Success Good support from Director and upper management Good communication with all Gemini staff Good support from science staff (very patience) Good knowledge of all our telescope and instrument systems. And on top of all that a great Engineering Team!!.