SLC vertical survey network
During 1984 and 1985 the SLC alignment group established and measured a system of elevation benchmarks (BM's) over the whole of the SLAC site, ranging from the injector area to the NGS horizontal control point (surface monument) AA on the hill to the east of the collider hall outside the radiation fence. Precise elevations are needed in general for survey, alignment, placement, and monitoring of SLC tunnels and components. In particular, precise elevations of the survey instruments, mounted over penetrations to the tunnels and over the horizontal control points, are needed for the reductions of measured distances on the surface. Precise elevations were also needed at several other locations, like sector 1, 10, 19, and 30 along the LINAC (for the Global Positioning System measurements), outside of the IR 8 access to PEP (to connect the run from the SLC Master Benchmark R306 close to LINAC station 100 + 00 through the PEP SIT tunnel), and at the south-west adit to the SLC tunnel (to connect the BSY run). Permanent benchmarks were, therefore, installed close to these locations. To minimize errors and simplify re-leveling, turning points were also permanently installed. Figure 1 shows the locations of the elevation benchmark east of LINAC sector 30 and the course of the premanently installed leveling runs.
- Research Organization:
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- DOE Contract Number:
- AC03-76SF00515
- OSTI ID:
- 6202908
- Report Number(s):
- SLAC-CN-316; ON: DE86006805
- Resource Relation:
- Other Information: Portions of this document are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
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