Page 1 Mosaic 1.1 Progress Report March, 2010 1 Project Management 1.1 Milestones Achieved • All CCD detectors have been received from e2v Technologies! • All parts needed for the e2v test Dewar have been fabricated and assembly is underway. • The MONSOON Orange DHE has been assembled and tested. The configuration of the sequencer and PAN software is underway. • A top-level commissioning plan was completed and reviewed internally. A formal request for T&E time on the 4-meter telescope in October 2010 (semester 2010B) has been submitted. • The detailed mechanical design of the focal plate is complete, but the final design review has been postponed due to thermal design concerns that require an engineering analysis to be performed. 1.2 Changes in Key Personnel Gary Muller will spend a week or so conducting an engineering analysis of the Mosaic focal plane thermal performance. Kathie Zelaya has been assigned as the lead electrical technician for the Mosaic project. 1.3 Base Budget The following table shows a month-by-month summary of the labor usage in hours by major WBS element through March 31, 2010. Month WBS Element Nov-09 Dec-09 Jan-10 Feb-10 Mar-10 Apr-10 May-10 Cumulative Totals Project Management 23.2 73.7 156.5 55.0 88.5 396.9 Detector System 16.0 43.5 49.0 67.5 176.0 Dewar Assembly 77.5 301.5 122.0 165.0 666.0 Software 59.0 33.0 62.0 154.0 System Integration 0.0 Commissioning 0.0 Total Labor Hours 23.2 167.2 560.5 259.0 383.0 1392.9 FTE Equivalent 0.01 0.10 0.33 0.15 0.22 0.00 0.00 0.81 The cumulative labor hours used is currently 38% of the labor budget. According to schedule tracking the project work is 34% complete. Thus, the project is slightly (~4%) over budget at this point. The following graph shows the cumulative totals for the actual labor hours used versus the scheduled labor hours. Currently the actual labor hours used exceeds those projected by the schedule by a slight amount. However, since the project is very close to being on-schedule, and the difference between the actual and projected is decreasing, it indicates that the work in March was overestimated and is compensating for the overruns that occurred in January and February.
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Mosaic 1.1 Progress ReportMarch, 2010
1 Project Management
1.1 Milestones Achieved• All CCD detectors have been received from e2v Technologies!
• All parts needed for the e2v test Dewar have been fabricated and assembly is underway.
• The MONSOON Orange DHE has been assembled and tested. The configuration of thesequencer and PAN software is underway.
• A top-level commissioning plan was completed and reviewed internally. A formal request forT&E time on the 4-meter telescope in October 2010 (semester 2010B) has been submitted.
• The detailed mechanical design of the focal plate is complete, but the final design review hasbeen postponed due to thermal design concerns that require an engineering analysis to beperformed.
1.2 Changes in Key PersonnelGary Muller will spend a week or so conducting an engineering analysis of the Mosaic focal planethermal performance.
Kathie Zelaya has been assigned as the lead electrical technician for the Mosaic project.
1.3 Base BudgetThe following table shows a month-by-month summary of the labor usage in hours by major WBSelement through March 31, 2010. Month
Total Labor Cost $1,741 $8,849 $29,978 $13,974 $20,827 $75,369
Capital Expenditures $0 $20,908 $0 $4,477 $16,294 $41,679
Total Monthly Cost $1,741 $29,757 $29,978 $18,451 $37,121 $117,048
The cumulative labor hours used is currently 38% of the labor budget. According to scheduletracking the project work is 34% complete. Thus, the project is slightly (~4%) over budget at thispoint.
The following graph shows the cumulative totals for the actual labor hours used versus thescheduled labor hours. Currently the actual labor hours used exceeds those projected by theschedule by a slight amount. However, since the project is very close to being on-schedule, andthe difference between the actual and projected is decreasing, it indicates that the work in Marchwas overestimated and is compensating for the overruns that occurred in January and February.
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Cumulative Labor for the Mosaic Upgrade Project
0.0
500.0
1000.0
1500.0
2000.0
2500.0
Nov-09 Dec-09 Jan-10 Feb-10 Mar-10 Apr-10 May-10
Month
Wo
rk-H
ou
rs
Actual Labor Hours Used(thru 3/31/10)Scheduled Labor Hours
1.4 Supplemental BudgetThere were no charges to the supplemental budget in March.
1.5 ScheduleOverall, the project is very close to being on-schedule and there are currently no schedule slipsthat should affect the completion date of October 29, 2010. Only two tasks are currently behindschedule.
The final design review for the mechanical component of the project has been delayed to allow anengineering analysis to be completed for the thermal design. Temperature tests that wereconducted with the existing instrument indicated that the performance was marginal and,although trying to improve this would increase the scope of the project, the project team decidedthat it was an important enough aspect of the instrument to warrant an analysis. Gary Muller wasrecruited to do the engineering analysis, which was estimated to take a week to complete, butproblems with the FEA software and Gary’s other commitment to ODI has increased the durationof the effort significantly. The slip of the mechanical final design has not put this on the criticalpath yet, and so the effort continues.
The software interface requirements have not been completed and this will delay thedevelopment of sample GUIs for users to evaluate, as well as the final design review for thesoftware. This does not pose any schedule risk at this time as there is ample contingency builtinto the schedule.
1.6 ContingencySome labor contingency (using more resources than scheduled) has been needed to cover tasksthat were not included in the schedule or were under-estimated. Schedule contingency is beingused to absorb delays in the mechanical design and software interface requirements efforts.
1.7 Configuration ManagementThere are no changes to report regarding configuration management.
2 Systems Engineering
2.1 RequirementsA draft of the software interface definition document, written by Steve Howell, has been reviewedby a select group of people and comments have been forwarded to Steve. The document iscurrently under revision and will be distributed for a formal release soon. Following the formal
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release of the document, sample GUI’s will be developed for people to evaluate and then a finaldesign review will be conducted.
2.2 Risk ManagementThe main technical risk is still the thermal performance of the Dewar. The first stage of theengineering analysis being performed by G. Muller, a characterization of the current design, hasbeen completed. The second stage of the analysis, an evaluation of the proposed new design toensure thermal performance is not degraded, is in progress. The third stage of the analysis, aconsideration of design changes that can be made to improve the performance, may be curtaileddue to the delay in getting the work done. There may be other risk mitigating measures that canbe taken, such as operating the focal plane at warmer temperatures, and these will be reviewedduring the mechanical final design review.
2.3 Instrument InterfacesAll instrument electrical interfaces have been designed and documented in preparation for thefinal design review. Schematics are available on the project web page(http://www.noao.edu/ets/mosaic)
2.4 Design ReviewsThe commissioning plan review was completed and the commissioning time has been requestedon the Mayall telescope.
The final design of the electro-mechanical component of the project has slipped and will beconducted in April.
The Software Interface review has slipped and will occur sometime in late April or early May.
3 DetectorsAll CCDs (eight science grade and one engineering grade) have been received from e2vTechnologies along with the ZIF connector sockets and a mechanical sample. This order is nowcomplete. Testing of the detectors will begin soon after the test Dewar has been assembled andleak tested.
4 MONSOON ControllerThe Mosaic detector head electronics has been assembled and tested. The system is now beingconfigured for lab testing of the e2v CCDs. The associated cabling needed to run the system hasalso been completed. The power supply needed to run the Mosaic DHE had to be re-designed toprovide more power. The parts to build the new supply have been received, but the mechanicallayout and fabrication of the enclosure is not yet complete. Fabrication will begin after the finaldesign review of the mechanical systems. This supply is not needed for lab testing and so thereis no urgency to complete it.
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5 Mechanical SystemsThe test Dewar fabrication is complete and assembly is well underway. The pictures below showthe chip mount assembled with one of the e2v CCDs installed.
The detailed mechanical design for the Mosaic upgrade is almost complete. The focal platedesign is complete pending the outcome of the thermal design analysis. The mounts for theMONSOON DHE and temperature controller have been completed. The DHE power supplyenclosure design is nearing completion. All these components will be reviewed at the final designreview that is expected to take place as soon as the thermal engineering analysis is complete.
The new focal plate installed on the existing Dewar front plate assembly. The interfaceconnectors to the MONSOON electronics are located to the left and right of the focal plate (four
connectors on each side).
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The Mosaic instrument with the MONSOON DHE (bottom) and temperature controller (top)mounted on the instrument.
6 Electrical SystemsDesign of all electrical systems is complete and ready for a final design review.
7 Software SystemsIn an effort to minimize the number of different computers needed for Mosaic (to simplify sparing),a different type of Systran fiber interface was purchased (PCI express vs PCI standard). Thisdecision was also made to reduce the cost of PAN computers and to address future compatibilityissues (availability of PCI standards in new computers). A significant effort was required to adaptthe MONSOON PAN software to the new Systran, due to changes in their protocol, but all issueshave been resolved and the PAN-to-DHE communications have been established with the newconfiguration.
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