R. van Weelderen, LIUWG, IT upgrade phase I: Status of cryogenic scheme evolution (in work) Outline - Old & new layout - Design constraints - Cryogenic scheme - QRL interface, cryogenic distribution & superconductor junction box: pipe sizing and valve adaptations

R. van Weelderen, LIUWG, Old & New, with cold D1, inner triplet layout in IP1 & IP5

R. van Weelderen, LIUWG, Cryogenic system: design constraints (1/2) The cooling of the magnets for the Phase-I Upgrade and the associated cold power transfer system will be realized within the boundaries of the existing cryogenic infrastructure: the types and maximum available quantities of cryogens may not exceed the presently available supply provided in IR1 and IR5 by the cryogenic distribution line (QRL) and the respective refrigeration systems. Design pressures of the new equipment are also subject to the present LHC specification The present QRL service modules contain most of the functionalities necessary for the Phase-I Upgrade but possible re-use is limited by: 1) Increasing the piping dimension is prohibitive, 2) The existing valves can be adapted to new requirements by changing their poppets (within reasonable limits). 3) Functionalities exceeding the possibilities of the existing service module would need to be provided by a local cryogenic distribution box. 4) The QRL service module itself should preferably be moved to a new location in between the correctors and D1. Keeping it at its present location would require a dedicated cryogenic extension line with many pipes and high diameters to limit pressure drops. The construction of entirely new service modules should also be considered.

R. van Weelderen, LIUWG, Cryogenic system: design constraints (2/2) Basic flow scheme provides: - D1 cooled by pool boiling - D1 with warm bore (no actively cooled beam screen) - CP + IT cooled by HeII using an internal bayonet HX of ID 95 mm - CP + IT with cold bore and actively cooled beam screen - Cold powering via a link and remote DFX

E F B D C CP Q3Q2bQ2aQ3 CV910 D1 CV947 beam screen CV915 new CV950 EH84 7 TT84 7 CV920 QV920 QV923 new L&V WRL EH CY1 CY2 EE LD1 LD2 XB CC’ CC’3 CS DH FF HeII pressurized (1.9 K) HeI saturated (4.5 K) HeI supercritical (4.5 – XX K) HeII saturated (1.9 K) LH HeI supercritical (4.5 – 20 K) CV930

R. van Weelderen, LIUWG, Cryogenic scheme: QRL interfaces (1/3) PipeDescription (old)Description (new)Interface IDCryostat IDQRL service module valve D&F box valve CY1 (CY1)1.9 K, liquid supply 10 CV910- CY1 (CY!) bypass1.9 K liquid supply bypass --CV915- EE (F1)70 K screen supplyD1, IT, CP, D&F box 70 K screen supply LD1Safety ITSafety IT + CP5040SV920- LD1 bypassCool down & fill supply --CV920- LD2Cool-down & fill return, safety IT Cool-down & fill return, safety IT + CP 5040SV923- XB1.9 K, gaseous return 70  

R. van Weelderen, LIUWG, Cryogenic scheme: QRL interfaces (2/3) PipeDescription (old)Description (new)Interface IDCryostat IDQRL service module valve D&F box valve CC ’ (CC ’ 2)4.6 K, TAS and beamscreen supply 4.6 K, beamscreen supply CS (CC ’ 1)4.6 K, lead box supply 4.6 K sub-cooler10 CV930 DH 20 K, lead supply, lead-box return D1, D&F box return 20 -> 30 for safety PV930 -> - (to be suppressed) PV930 on D&F box return only (D1 parallel return open) FF (E2) 80 K screen return D1, IT, CM, D&F box 80 K screen return 15 CV950- KD (CC ’ 3)20 K, beamscreen return 10 CV947- TD 20 K, TAS return unused10 CV941-

R. van Weelderen, LIUWG, Cryogenic scheme: QRL interfaces (3/3) PipeDescription (old)Description (new)Interface IDCryostat IDQRL service module valve D&F box valve CD1-D1 level control (NEW) 15 CVnew- CD1 ’ -D1 cool-down, fill & warm-up (NEW) 20 CVnew -XB line needs size increase: 70  95 or 100 (pressure drop) -DH line needs size increase: 20  30 (D1 quench safety) -Two new C-D1 lines: (level control & cool-down/fill/warm-up) -One line redundant (TD) -Cold powering & DFX cooling mode flexible (returning or not to FF, D) The construction of entirely new service modules should be considered.