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Status Report on Bus Bars and Mechanical Calculations in Cryostat Studies

This report presents a comprehensive analysis of the status of bus bars in the context of cryostat studies, with a focus on mechanical calculations of beam bending and deflections. Key observations are detailed for sectors LE.L5 and LE.L6, assessing the impacts of electro-magnetic forces on bar mechanics. The findings include modeling constraints derived from Comsol Multi-physics and examine fixed point and sliding support states. Overall, the report establishes the maximum acceptable spacing for supports and the performance of various configurations under nominal and ultimate conditions.

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Status Report on Bus Bars and Mechanical Calculations in Cryostat Studies

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  1. Connection Cryostats:status of bus bars studiesReport to nMPPV.Parma, P.Borowiek, C.Maglioni

  2. C.Maglioni, MSC-IC Mechanical calculationsof BB deflections

  3. Observations in 11L6 (J.-Ph.T. & C.)

  4. Modelling of bus bars constraints FP 1 2 3 4 5 6 7 1 2 3 4 5 6

  5. Electro-magnetic forces • In-plane mechanical model • Proportional to I2 • Inv. proportional to distance Comsol Multi-physics

  6. J.-Ph.Tock, 9th March ‘09

  7. Sector cold LE.L5 (Long) Powered 22 times on RB (<10.3kA), 14 times on RQs (<10.9 kA) M3 0 (1’000) 2’070 (860) 1440 (1’000) 850 (1’000) 550 (1’000) ?? (1’000) 09Apr2008 1’060 (1’000) ?? (1’000) ?? (1’000) ?? (1’000) ?? (1’000) ?? (850) FP 1 2 3 4 5 6 7 1 2 3 4 5 6 Fixed Point Sliding Support state on 06 April 2009, modified by Pawel Borowiec

  8. Powered 105 times on RB (<11.2kA), 76 times on RQs (<11.3kA) Sector warm LE.L6 (Short) M1 31Mar2009 13Feb2009 130 ?? (100) 970 (1’000) ?? (389) 1’010 (1’000) 1520 (1’000) 860 (1’000) 640 (500) 400 (500) 1’000 (1’000) 440 (1’000) 1’000 (1’000) 110 (1’000) 1’870 (1’000) 920 (1’000) 450 (379) FP 1 2 3 4 5 6 7 1 2 3 4 5 6 bent bus-bar M2 To be measured again 110 (100) ?? (1’000) ?? (389) ?? (1’000) ?? (1’000) ?? (1’000) ?? (500) 31Mar2009 500 (500) 990 (1’000) ?? (1’000) 1’000 (1’000) 1’200 (1’000) 1’010 (1’000) 920 (1’000) 480 (379) FP 1 2 3 4 5 6 7 1 2 3 4 5 6 M3 31Mar2009 13Feb2009 160 ?? (100) 1280 (1’000) ?? (389) 1’260 (1’000) 680 (1’000) 1’040 (1’000) 640 (500) 1’000 (1’000) 640 (1’000) 780 (1’000) 80 (1’000) 2’160 (1’000) 480 (1’000) 890 (379) FP 1 2 3 4 5 6 7 1 2 3 4 5 6 Fixed Point state on 06 April 2009, modified by Pawel Borowiec Sliding Support

  9. Quad. BB max. deflection as a function of Support spacing and current

  10. Summary of mechanical calculation • With nominal spacing: • M1, M2 (quad BB): elesticity marginal @ 5TeV; some plastic def. at ultimate; deflections well within tube diameter • M3 (dip. BB): within elastic domain up to ultimate; deflections well within tube diameter • Maximum acceptable supports spacing (tube contact) for quad BB (limiting as compared to dip. BB): • @ 5 TeV: up to ~1.55 m • @ nominal: up to ~1.33 m • @ ultimate: up to ~1.3 m

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