This page will greadually expand to cover design information for Phobos facilities on-site at BNL. As a start, you will find a rough drawing of a proposed counting house. This drawing was primarily intended to demonstrate that a building that was 20ft*40ft would really be too small to hold what we need. However, I'd appreciate comments from everyone on the items included, the rough layout, sizes, etc.
Plots of the counting house are available as both gif and Postscript figures. The dimensions are in units of feet.
The new, improved, expanded counting house drawing is now available! I think this is much closer to what we need (and probably as large as we can expect). As before, there are both gif and Postscript figures and the dimensions are in units of feet.
Another item we need is a cable access tunnel through the berm to the area. These are PRELIMINARY ideas for the design of the cable access tunnel. In deciding on the number of cables, I have tried to consider our needs for diagnostics, setup, and monitoring, as well as possible future expansion.
The design begins with a starting point assumption of a tunnel with an inner diameter of about 1.5 ft (roughly 45 cm) into which one can easily fit a square array of cable trays with a dimension of 1.0 ft (roughly 30 cm).
This square array would have three separate sections of roughly 3-6 inches by 12 inches (7-15 by 30 cm) each. One section (the largest) would contain HV and coax signal cables. Preliminary estimates are 50 HV and 200 BNC cables. Ideally, some fraction (1/4?) of the BNC cables would be the fast variety with modified dielectric. Assuming 7*7 mm for each cable (which is generous), 250 cables will occupy a volume of about 120 square cm so a tray of dimension 15*30 cm should be more than adequate. The connectors at the ends will be much larger than this. Most likely the cables will be pulled first and then have the connectors attached.
A second tray will contain the optical fibers. We should probably have expansion and spares in mind and pull somtheing like 200 of these. I don't know what we plan to use but I assume these are somewhat smaller than BNC cables so 7*30 cm might suffice.
The third tray is reserved for computer and communication/network cables. We should think carefully about how many and what types of connections we need including lots of spares. We should have cables needed to communicate with Fastbus and CAMAC directly even if we don't plan to use those during the actually run so we have alternatives during setup and testing. The length of the tunnel will probably be too long for GPIB communication.
Based on these sizes, such a tunnel might suffice but is probably close to the minimal size required. One thing to keep in mind is that it will be much harder to add anything at a later date.
-George Stephens