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New ATLAS VI Mechanical Tolerances

This document outlines the mechanical tolerances related to the ATLAS IBL staves beam pipe, focusing on a 45mm ID inner support tube (IST). It includes a convergence analysis using Ansys to study the effects of self-weight, heater loads, and thermal forces. Key tolerances for sliding gaps, beam pipe sag between supports, and concentricity are detailed to ensure structural stability and alignment during operation. A summary of aperture tolerances is also provided, emphasizing the importance of maintaining a 2.8mm clearance for cavern stability throughout the experimental runs.

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New ATLAS VI Mechanical Tolerances

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  1. New ATLAS VI Mechanical Tolerances 1

  2. Insertable B-Layer (IBL) Current IST support IBL Staves Beam Pipe 45mm ID IBL Inner Support Tube (IST) 2

  3. Sag - Proposed 45ID IP Self weight + heaters (34.23N ) B A services (100 N) services (100 N) Thermal FA (236N) 720.5 720.5 MB(31.4N) 2073 2073 3425 3425 7300 Convergence at element size of 0.25m in Ansys 3

  4. Mechanical Tolerances for Aperture Calculation Survey* Gap between supports and IST to allow sliding IST Beam Pipe Sag between supports Tolerances on supports Inbuilt offset between centre of beam pipe and beam centre* End to end concentricity and circularity 4 *Included for information only

  5. Mechanical Tolerances for Aperture Calculation 5

  6. Summary for ATLAS Aperture Tolerances • Leaves 2.8 mm available for stability of cavern during run and between alignments 6

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