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>From Hitoshi Yamamoto: --------------the MDI panel statement--------------------------------- The MDI panel had a meeting on Dec. 8 and discussed the push-pull option. There were reports from the three concept studies and the WWS about their respective statements. In general there was grave concern about the risk of losing the 2-detector scenario in its entirety. There was also concern that the push-pull option for 2 detectors at a single IR has not been investigated sufficiently thoroughly to allow a sound technical basis for its acceptance as the baseline. The fact that the primary motivation for the push-pull model is to save on the cost of the accelerator has caused considerable misunderstanding within the detector community, which does not enjoy the same level of cost-consciousness as the GDE. We thus suggest that there be efforts both by GDE and WWS/Concepts to share and communicate the overall cost reduction strategy, possible trade-offs, and its implementation. Regarding CCR#23, we recommend that, if the push-pull option be included as the baseline, then the 2 IR option be also explicitly included in RDR as an 'alternative configuration', with a cost estimate. We understand that such a cost estimate may, by necessity, be less complete than the baseline cost. In addition, provisions should be included in the baseline design to facilitate a change to the 2 IR design in the event of either: a) the push-pull model proving unfeasible, or b) additional funding being secured for a second BDS and IR. Finally, we urge the GDE and the WWS to give a new charge to the push-pull task force to continue the study of the technical implementation of the push-pull option. --------------- -- James E. Brau Physics Department and Center for High Energy Physics 1274 University of Oregon Eugene, OR 97403-1274 (541) 346-4766