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Displacement of VV at Normal Operation Comparison with Free Expansion at Constant Temperature

Displacement of VV at Normal Operation Comparison with Free Expansion at Constant Temperature. IVC Coil Analysis has assumed the VV grows uniformly to an average temperature of 110C from 20C. This growth is used to apply enforced displacements at the base of the rails

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Displacement of VV at Normal Operation Comparison with Free Expansion at Constant Temperature

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  1. Displacement of VV at Normal Operation Comparison with Free Expansion at Constant Temperature • IVC Coil Analysis has assumed the VV grows uniformly to an average temperature of 110C from 20C. This growth is used to apply enforced displacements at the base of the rails • Analysis by the VV group shows some variation from this assumption • By subtracting out the free expansion from the Normal Operation Expansion, the difference can be quantified and its impact on the IVC coils assessed • A better estimate of the average thermal expansion can also be made which minimizes the differences with the Normal Operation Expansion • Results show a better average temperature to use is 102 C • This will induce more thermal stress in IVCs at Normal Operation because of the difference in thermal coefficients • But it also shows comparable magnitude of relative distortions • Effect on IVCs has not been quantified

  2. Displacements of VV Inner near ELM Coils Free Thermal Expansion, L*alp*dT, subtracted from VV Displacements to estimate effective T T=100 C T=110 C Scale x200

  3. Displacements of VV Inner near ELM CoilsIncreased Magnification to get better fit T=100 C – not enough T=105 C – too much Scale x2000 T=102 C – just about right

  4. Local Vertical Distortions after Free Expansion is Subtracted Out -.25 mm T=102 C

  5. Local Toroidal Distortions after Free Expansion is Subtracted Out -.08 mm

  6. Observations • The average growth from the VV model best matches an average temperature change of 82 C or an average VV temperature of 102 C (not 110 C as assumed) • After subtracting out the average thermal growth there remains a VV distortion of ~.25 vertically and .08 mm horizontally in the vicinity of the Mid ELM Coils • For comparison, the Relative Growth of the Mid ELM Coils with respect to the VV is .17 vertically and .22 horizontally • based on an effective thermal coefficient of expansion of 15.61 mm/m-C and VV value of 16.5 mm/m-C and 82C temperature rise. • VV distortion is significant and needs to be addressed.

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