Update on TDIS HLLHC integration meeting David Carbajo

Update on TDIS HL-LHC integration meeting David Carbajo Perez with input from Antonio Perillo Marcone, Regis Seidenbinder, Luca Gentini, Caterina Bertone, Maria Perez Ornedo 2020/03/06 (Indico link)

Update on TDIS HL-LHC integration meeting Agenda § Chassis reinforcement: o Motivation o Countermeasures o Implications § Transport-related changes § Conclusions David Carbajo Perez (EN-STI-TCD) 2

Update on TDIS HL-LHC integration meeting § Chassis reinforcement - Motivation Ø TDIS tanks linked by means of bellows -> not a rigid assembly! F = 1. 4 tons Tank A Tank B Tank C F = 1. 4 tons Ø Under vacuum, atmospheric pressure gives rise to resulting compression force = 1. 4 tons David Carbajo Perez (EN-STI-TCD) 3

Update on TDIS HL-LHC integration meeting § Chassis reinforcement - Motivation Ø TDIS tanks linked by means of bellows -> not a rigid ensemble! Tank A F = 1. 4 tons Tank B Tank C F = 1. 4 tons TDIS Girder Ø Under vacuum, atmospheric pressure gives rise to resulting compression force = 1. 4 tons Ø Tanks fixed to TDIS girder -> high off-axis load acting on the latter David Carbajo Perez (EN-STI-TCD) 4

Update on TDIS HL-LHC integration meeting § Chassis reinforcement - Motivation Ø Axial load produces elastic deformations in chassis -> large module gap decrease module gap Tank A F = 1. 4 tons module gap Tank B Tank C F = 1. 4 tons TDIS Girder Ø Bake-out of device: additional reduction of gap -> high risk of damaging RF-contacts between jaws (critical for impedance purposes) Ø In this configuration the alignment between modules is no longer valid after bake-out David Carbajo Perez (EN-STI-TCD) 5

Update on TDIS HL-LHC integration meeting § Chassis reinforcement - Countermeasures Ø Addition of reinforcement bars to chassis -> gap reduction improved by 60% Extra weight ≈ 370 kg David Carbajo Perez (EN-STI-TCD) 6

Update on TDIS HL-LHC integration meeting § Chassis reinforcement - Implications Ø Repositioning of laser tracker alignment references: 525 mm (current: 465 mm) 5080 (curren mm t: 4740 m m) David Carbajo Perez (EN-STI-TCD) 7

Update on TDIS HL-LHC integration meeting § Chassis reinforcement - Implications Ø Addition of extension to raise 125 mm the vacuum pumping port David Carbajo Perez (EN-STI-TCD) 8

Update on TDIS HL-LHC integration meeting § Transport-related changes Ø TDIS heavier than expected (4. 3 tons without reinforcement) -> its weight exceeds carrying load of some handling equipment. Actions (EN-HE): q Following components to be replaced: lifting frame horizontal bars (UPN 100 ->HEB 100) and lifting rings plus tunnel rail hoists. 3 D integration is being updated q To limit speed (3 km/h instead of 6) and usage (max 4 times per year) of transport trolley David Carbajo Perez (EN-STI-TCD) 9

Update on TDIS HL-LHC integration meeting § Conclusions Ø Reinforcing the TDIS chassis is required to limit modules’ displacement under vacuum -> impact on: o TDIS weight: 4. 3 -> 4. 7 tons o Position of laser tracker references o Pumping port height (raised by 125 mm) Ø TDIS overweight -> impact on transport / installation: o Lifting frames’ horizontal bars (UPN 100 ->HEB 100) plus tunnel rail hoists to be replaced o Transport trolley speed (3 km/h instead of 6) and usage (max 4 times per year) David Carbajo Perez (EN-STI-TCD) 10

Thanks for your attention David Carbajo Perez (EN-STI-TCD) 11