William presented a brief review of the involvement the Toronto group has had in the ATLAS inner detector project. This has mostly involved prototyping work for the Frequency Scanned Interferometry system that has been proposed to monitor the shape of the SCT support structre by the Oxford group and to be extended to the pixel detector by the Toronto group. This work began as part of the Toronto group's involvement in the CDF silicon tracker. More information on this can be found here .
A document describing the system proposed for the ATLAS pixel detector can be found here . William showed transparencies that were prepared for the ATLAS inner detector alignment meeting that was held in Oxford on July 1, 1998. They are available here .
The work on the FSI system for the ATLAS pixel detector system has been suspended. Unlike the SCT system the pixel detector is not much larger than current silicon vertex detectors being used in other high energy physics experiments. Thus the support mechanics can "easily" be designed to be rigid and dimensionally stable. Further the lines of sight necessary for the FSI system are harder to ensure in the smaller pixel detector structure. Fianlly the thermal barriers between the bulk of the pixel detector and the inner-most B vertexing layer present an additional impediment to using FSI in one of the locations where it might be most useful.
The FSI-quill developped in Toronto has led to an injection moulded successor developped by the Oxford group. This is currently being used to make a full scale mockup of the FSI system for the SCT to provide a proof in principle of the FSI technique to monitor an extended HEP detector support structure.