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February 17-18, 2010
R&D ERL
Roberto Than
R&D ERLCryogenics
Roberto Than
February 17-18, 2010
CRYOGENICS
February 17-18, 2010
R&D ERL
Roberto Than
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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February 17-18, 2010
R&D ERL
Roberto Than
e-CX 5 Cell Cavity Cryomodule P&ID
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FPC interceptEndbore Intercepts
Tuner Intercepts
Intercept cooling: 3atm, 5K
Nitrogen Shield
550L
RESERVOIR: 550L
February 17-18, 2010
R&D ERL
Roberto Than
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
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February 17-18, 2010
R&D ERL
Roberto Than
e-CX 5 Cell Cavity System Thermal Load
• 2K Helium Load• Cavity
Dynamic Load 40 W
Static Load 6 W (~20W)
• ReservoirLHe 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 supplyF.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
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February 17-18, 2010
R&D ERL
Roberto Than
e-CX 5 Cell Cryomodule Reliefs
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VOLUME Set Prespsig
LoadkW
ReliefRatekg/s
Req’ Areain2
Relief AreaIn2
MNFA
Helium side
5 0.05 Relief valve
Helium side
8 60Loss of UHV vacuum to air
3.6 5.8 12.7 Disk
UHV side 6-7 25 1.56 2.2 2x 1.4[2 x 2” Disk]
InsulatingVacuum
1.5 85 3.6 10@ 7 psi
6” lift plate
February 17-18, 2010
R&D ERL
Roberto Than
SRF Gun Cryomodule P&ID
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FPC’s InterceptsEnd flanges& HTS solenoid Intercepts
Intercept cooling: 3atm, 5K
Nitrogen Shield
160L
Reservoir: 160L
LN2
Cathode Cooling LN2 Loop
February 17-18, 2010
R&D ERL
Roberto Than
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
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February 17-18, 2010
R&D ERL
Roberto Than
SRF Gun System Thermal Load
• 2K Helium LoadDynamic 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 supplyF. 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
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February 17-18, 2010
R&D ERL
Roberto Than
SRF Gun Cryomodule Relief
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VOLUME Set Prespsig
LoadkW
ReliefRateKg/s
Req’ Areain2
Relief AreaIn2
MNFA
Helium side 5 0.05 Relief valve
Helium side 8 14Loss of
insulating vacuum to air
0.87 1.4 5 [3” Disk]
UHV side 6-7 7.2 0.45 0.9 1.4[1.5” Disk]
InsulatingVacuum
7 75 4.3 9 30[6” Disk]
February 17-18, 2010
R&D ERL
Roberto Than
SRF Gun Cathode Tip Cooling
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ATM
LN2 COOLED50WCONVECTION NUCLEATE BOILINGX<10%FLOW: 5 g/s
February 17-18, 2010
R&D ERL
Roberto Than
Cryo System Diagram
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Purifier
Subcooler
GAS STORAGE
Main Plant
1660S
300 W
Or
3 g/s
VACUUM PUMP
2 - 4K 2 - 4K
LIN
LHe Storage
LHe supply
Vhe Return
2 - 4K 2 - 4K
FPC2FPC
ENDBORE & SOLENOID
ENDEND
E-CX 5-cellSRF Gun
February 17-18, 2010
R&D ERL
Roberto Than
Cryo System Equipment
Compressor: 50 g/s Sullair with Oil Vapor Removal System
300 W or 3 g/s 1660S 4.5K piston expander plant
With Wet-expander pod: 3.5 g/s
1000 Gallon (3800 liter) Liquid Helium dewar
LHe Subcooler: 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
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February 17-18, 2010
R&D ERL
Roberto Than
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
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February 17-18, 2010
R&D ERL
Roberto Than
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
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February 17-18, 2010
R&D ERL
Roberto Than
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) dia Vertical 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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