10.1 Overview

This project is scheduled over a 4 year period (Figure 10.1), utilizing approximately 60,000 man hours of effort (70,000 with both beams). In the period between Jan 1995 and Aug 1998, it will be the major project in the Lick Observatory Labs.

Following the completion of the PDR review, a major effort will begin on mechanical design. By February 1995, three engineers will be working full time on the project, which is expected to continue for about 6 months, when we will cut back to two. The first areas to be designed in detail are the Slit Masks and Slit Mask Handler, the Instrument Structure/Enclosure, and the Camera barrels and mounts. Figure 10.1 shows the planned schedule for design and fabrication.

Major milestones are shown in Figure 10.2 (triangles). We are currently planning to purchase the optical glasses for the cameras and start fabrication on the lenses in the Optical Lab in the spring of 1995. During this period we are also planning to purchase the Slit Mask Cutter and start an extensive testing program. The new large shutter will also be extensively tested during this period.

In mid-May 1995 we are planning a PDR of the Data Acquisition, Handling, and Analysis software.

We have a milestone at the middle of 1995 showing the approximate time we need to have a decision to build two beams of the instrument. At about this time the opticians may be ready to start on some of the lenses for the second beam.

The Critical Design Review (CDR) is planned for November 1995. By then we will have designed and fabricated the Slitmask Handling System and started tests, we will have designed the instrument structure and support/drive systems, the collimator mirror cell and support, and the Tent mirror system. We will have started design of the dewar system although the final choice of CCD may not have been made. A major fabrication effort will start shortly after the CDR.

For the year following the CDR, we will be designing the remaining parts of the spectrograph including the Grating and Filter systems, and completing the design of some of the ancillary systems for the enclosure, including the Hatch Cover and cooling systems. A major effort in this period will be completing the design of the CCD mosaic, following the choice of detector early in 1996. The mechanical design effort will have largely ended by the end of 1996 and integration and testing of subassemblies started. Final assembly of the instrument structure/enclosure is scheduled to begin in late summer of 1996.

In mid 1996 we are planning the CDR for the Data Acquisition, Handling, and Analysis software, and in late 1996 we plan to have delivery of the Leach Controller and first light on one of our detectors with the full-up electronics system.

The process of integration, alignment, and testing of the complete spectrograph is planned to start in the fall of 1997. First Light through the complete spectrograph is planned for November 1997. We plan to ship the instrument to Hawaii in the spring of 1998 and to commission the instrument in Hawaii during the summer.

Some of the most significant assumptions made during the development of the schedule were that:

1) The camera optical materials could be ordered and optical fabrications started soon after the completion of the Preliminary Design Review

2) The Engineering Lab should be able to carry out other, smaller design jobs during most of the development time of DEIMOS.

3) For a period of 1 year to 18 months, DEIMOS can be the only project in the Optical Lab.

4) Should both barrels of the instrument be funded, we can hire a temporary machinist into the Instrument Lab.

5) Software can hire the people or obtain the manpower estimated as necessary.

The completion date of the project remains mid 1998 regardless of whether we build one or two beams. The additional effort is added to the project by hiring an additional instrument builder to the instrument shop, using an additional person in the optical shop, and some additional effort in the electronics shop. However, the two-beam schedule depends on the decision to build two beams being made about mid 1995 and that the optical glass for both beams can be ordered following the PDR.