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R&D ERL Cryogenics

CRYOGENICS. R&D ERL Cryogenics. Roberto Than. February 17-18, 2010. Cryogenics System Introduction. e-CX 5 Cell Cavity Cryomodule SRF Gun Cryomodule Cold Cathode Cooling Cryogenic System Operation Summary Cavity cooled in 2K bath @ 23 Torr Warm vacuum pump 4.5K Cryo plant.

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R&D ERL Cryogenics

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  1. CRYOGENICS R&D ERLCryogenics Roberto Than February 17-18, 2010

  2. Cryogenics System Introduction • e-CX 5 Cell Cavity Cryomodule • SRF Gun Cryomodule • Cold Cathode Cooling • Cryogenic System • Operation • Summary • Cavity cooled in 2K bath @ 23 Torr • Warm vacuum pump • 4.5K Cryo plant

  3. e-CX 5 Cell Cavity Cryomodule P&ID RESERVOIR: 550L Intercept cooling: 3atm, 5K FPC intercept Endbore Intercepts 550L Tuner Intercepts Nitrogen Shield

  4. e-CX 5 Cell Cavity Heat Transfer • Niobium wetted area 1.6 m2. • Nominal surface heat flux: ~25 W/m2 • Kapitza resistance: 1.5 cm2-K/W • Kapitza temperature gradient: ~ 2.4 mK • Interconnect has a crossection area of 205 cm2. • Cross sectional heat flux density is approximately 0.3 W/cm2 • Interconnect is 80 cm tall • Superfluid conductivity gradient at 2K: about 1 mK

  5. e-CX 5 Cell Cavity System Thermal Load • 2K Helium Load • Cavity Dynamic Load 40 W Static Load 6 W (~20W) • Reservoir LHe Volume 3 W Fill valve 1.5 W Vac break 0.5 W Vent 3 W Total Load 54 W (~68W) • Intercepts cooling 3 atm, 5K supply F.Power Coupler 0.15 (0.3)g/s Transition#1 0.15 (0.3)g/s Transition#2 0.15 (0.3)g/s Tuner Total 0.45 (0.9)g/s Shield cooling: LN2

  6. e-CX 5 Cell Cryomodule Reliefs

  7. SRF Gun Cryomodule P&ID Intercept cooling: 3atm, 5K Reservoir: 160L FPC’s Intercepts End flanges& HTS solenoid Intercepts Nitrogen Shield 160L LN2 Cathode Cooling LN2 Loop

  8. SRF Gun Cavity Heat transfer • Niobium wetted area ~ 0.25 m2. • Nominal surface heat flux: ~30 W/m2 • Kapitza resistance: 1.5 cm2-K/W • Kapitza temperature gradient: ~ 20 mK • Interconnect has a crossection area of 46 cm2. • Cross sectional heat flux density is approximately 0.3 W/cm2 • Interconnect is 60 cm tall • Superfluid conductivity gradient at 2K: about 1 mK

  9. SRF Gun System Thermal Load • 2K Helium Load Dynamic Load 7 W Static Load 8 W Reservoir 1 W Fill valve 1.5 W Vent 3 W Total Load 21 W • Intercepts cooling 3 atm, 5K supply F. Power Coupler#1 0.075 g/s F. Power Coupler#2 0.075 g/s Transitions/solenoid 0.3 g/s Total 0.45 g/s Shield cooling: LN2

  10. SRF Gun Cryomodule Relief

  11. SRF Gun Cathode Tip Cooling LN2 COOLED 50W CONVECTION NUCLEATE BOILING X<10% FLOW: 5 g/s

  12. Cryo System Diagram GAS STORAGE VACUUM PUMP LHe supply LIN Vhe Return Main Plant 1660S 300 W Or 3 g/s Purifier 2 - 4K 2 - 4K LHe Storage Subcooler ENDBORE & SOLENOID 2 - 4K END FPC END 2 - 4K 2FPC E-CX 5-cell SRF Gun ENDBORE & SOLENOID END FPC END 2FPC

  13. Cryo System Equipment Compressor: 50 g/s Sullair with Oil Vapor Removal System 300 W or 3 g/s 1660S4.5K piston expander plant With Wet-expander pod: 3.5 g/s 1000 Gallon (3800 liter) Liquid Helium dewar LHeSubcooler: 200 liter, Plant output from 6K to 4.6K Warm He storage Tank: 43,000 Gal (162 m3) 3500 Liq liters@ 17 atm Warm Process Vacuum Pump: 5.5 to 6 g/s, 23 Torr @cryomodule Vertical LN2 Dewar: 11,000 Gal Cryogenic Transfer Lines System

  14. Cryo System 2K Capacity • No 4K to 300K Recovery • Liquefaction Load • 2K-4K Recovery HX • Reservoir • Peak Mode • 5-Cell: 400L usable • 4 hr @ 4.0 g/s: 92 W • Gun: 110 L usable • 3.0 hr @ 1.5 g/s: 35 W • Peak Mode • Draw down reservoir • No fill from JT valve • 5.5 g/s Vacuum Pump • 128 W @ 2K • Steady State • Constant level reservoir • Fill from JT valve • 2K-4K Recovery • 5.5 g/s Vacuum Pump • 94 W @ 2K

  15. Operation 2K • Load Max Min ReLiq • 2K Refrig Load 5.5 g/s 2.0 g/s 0.5 g/s • Intercepts : 1.5 g/s 1.5 g/s 0.5 g/s • Total Liquefaction: 7.0 g/s 3.5 g/s 1.0 g/s • 2500 L Reservoir from Storage Dewar • Plant 3.5 g/s 3.5 g/s 3.5 g/s+50W • Net Plant 2.4 g/s 2.4 g/s 2.5 g/s • Net draw rate -4.6 g/s - 1.1 g/s +2.5 g/s • Continuous 18 hrs 75 hrs 33 hr

  16. Summary • Cryogenic System: 128 W @2K peak for several hrs • 94 W Continuous Duty • Run peak cavity loads for at least 12 hours • Cryogenic Plant also serves Vertical Test Facility • 40 inch (1m) diameter Vertical Test Dewar • 14 inch (0.35m) & 28 inch (0.7m) diaVertical Test Dewar • Status • All equipment in location, warm piping under installation • Subcooler: Delivery July 2010 • Cathode Cooling LN2 System: Engineering • Cryogenic Transfer lines: Delivery • Batch1 October Batch 2 Nov 2010 • Installation & check out: to March 2011

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