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Decision #30 - Maintenance Unit Length

Decision #30 - Maintenance Unit Length. Options: Half the distance between refrigerators ~3km sector ~0.5km units (requires: 6 U-tubes or 24 valves at each location) BCD: ~3Km sector Pro: Minimizes the component count Minimizes the heat load. Con (500m units provide):

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Decision #30 - Maintenance Unit Length

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  1. Decision #30 - Maintenance Unit Length Options: Half the distance between refrigerators ~3km sector ~0.5km units (requires: 6 U-tubes or 24 valves at each location) BCD: ~3Km sector Pro: Minimizes the component count Minimizes the heat load. Con (500m units provide): Reduced thermal cycles on CMs. (factor ~5) Reduced warm up times (factor >2) Reduced cooldown times (factor ~10) Reduced He storage (factor ~5) Refrigeration load sharing Modular “upgrade” elements ACD: If the component reliability can not be reached; change design to 500m maintenance units. ACD R&D: 300mm cold valve design: A) cold actuator and B) “slow opening”

  2. Decision #38 - Refrigerator Spacing Drivers:T. Peterson’s presentation ~5km • 2K temperature (pressure), Gradient, Q, cavity shape & 300 mm pipe diameter determine the maximum length of the pumping line. • Maximum coldbox size 25kW of 4.5 K equivalent Options: • Pair of refrigerators at common locations each feeding a ~3.5km sector (Pipe limited) • Single larger refrigerator each feeding two ~2.8km sectors (Refr limited) BCD: Single refrigerator spaced ~5.6km Pro: • Option B minimizes the pressure drops in the CM • This reduces the baseline warm-up unit length. Con: • The TESLA design used option A; it permitted an initial half refrigeration installation • Increases the number of utility systems required: Purifiers, LN2 systems, LHe systems, GHe systems, ICW, etc Required task: After the Decisions #3, 10 & 25 etc are chosen the 5.6Km needs to be verified

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