Why the present shielding plan was abandoned
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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.

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Why the present shielding plan was abandoned
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.


Conceptual design of collimator
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.


Some ground rules
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.


Some desirable features
Some Desirable Features

  • Use existing mover system, if reasonable.

  • Use as much of the steel as reasonable.


Basic design choices
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.


Why the present shielding plan was abandoned
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.