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Reassessing the Shielding Plan: A Shift in Collimator Design for Enhanced Safety and Efficiency

The previous shielding plan for the collimators was abandoned due to high radiation levels, potential damage from crew interactions, and inadequate provisions for maintenance and removal. The new strategy focuses on an integrated collimator design that accommodates a comprehensive shielding system, facilitating safe servicing and potential future upgrades. Key features will include an external assembly and installation process, adherence to ground rules against temporary fixes, and a commitment to a full-system design. The project aims for efficient execution and enhanced safety standards.

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Reassessing the Shielding Plan: A Shift in Collimator Design for Enhanced Safety and Efficiency

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  1. Why the Present Shielding Plan was Abandoned. • Radiation levels in the area of the collimators meant that it would require several crews to complete the shielding job. • The awkwardness of location made it likely that the beam pipe or bellows would be damaged – particularly if we had multiple crews trying to work quickly. • The existing design did not allow for servicing of the motors, LVDT’s, or vacuum flanges without unacceptable radiation exposure. • There was no provision for the eventual removal of the system. • Conclusion: Remove collimators and do it right.

  2. Conceptual Design of Collimator • Integrate collimator and enough shielding for at least twice present Booster flux at 1% high field scraping into a movable system which can be assembled externally and installed quickly (~ 1 day) • Design must include a clear plan to scale up to the full shielding (MiniBooNE+NuMI @ 2% scraping). • After extended operation at full flux: • There must be a reasonable method for servicing the motors and LVDT’s. • There must be a reasonable plan to remove the central collimation system (“coffin”) in the event of a catastrophic failure (e.g. vacuum leak). • There must be a reasonable plan to remove the entire system in the event Santa brings us a new Booster.

  3. Some Ground Rules • No “quick and dirty” temporary solutions. What goes in, stays in. • No partial designs. Nothing goes in until we have a clear plan for the whole system.

  4. Some Desirable Features • Use existing mover system, if reasonable. • Use as much of the steel as reasonable.

  5. Basic Design Choices • Movable collimator inside a central coffin, all on rolling cart, around which full shielding could later be placed (Larry’s “11th hour solution”). • Bed of steel placed down first, central collimation system placed on top ( how ?) • Collimator fixed inside central shielding steel. Entire assembly is moved.

  6. Goal • Settle on broad features of design, and move ahead. • Peter Kasper will be in charge of the project (I will cover for him until he gets back). • Summer is soon than you think.

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