February 17-18, 2010 R&D ERL Roberto Than R&D ERL Cryogenics 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 23 Torr Warm vacuum pump 4.5K Cryo plant 2

February 17-18, 2010 R&D ERL Roberto Than e-CX 5 Cell Cavity Cryomodule P&ID 3 FPC intercept Endbore 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 m 2. Nominal surface heat flux: ~25 W/m 2 Kapitza resistance: 1.5 cm 2 -K/W Kapitza temperature gradient: ~ 2.4 mK Interconnect has a crossection area of 205 cm 2. Cross sectional heat flux density is approximately 0.3 W/cm 2 Interconnect is 80 cm tall Superfluid conductivity gradient at 2K: about 1 mK 4

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) 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# (0.3)g/s Transition# (0.3)g/s Tuner Total 0.45 (0.9)g/s Shield cooling: LN2 5

February 17-18, 2010 R&D ERL Roberto Than e-CX 5 Cell Cryomodule Reliefs 6 VOLUMESet Pres psig Load kW Relief Rate kg/s Req’ Area in 2 Relief Area In 2 MNFA Helium side 50.05Relief valve Helium side 860 Loss of UHV vacuum to air Disk UHV side x 1.4 [2 x 2” Disk] Insulating Vacuum 7 psi 6” lift plate

February 17-18, 2010 R&D ERL Roberto Than SRF Gun Cryomodule P&ID 7 FPC’s Intercepts End 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 m 2. Nominal surface heat flux: ~30 W/m 2 Kapitza resistance: 1.5 cm 2 -K/W Kapitza temperature gradient: ~ 20 mK Interconnect has a crossection area of 46 cm 2. Cross sectional heat flux density is approximately 0.3 W/cm 2 Interconnect is 60 cm tall Superfluid conductivity gradient at 2K: about 1 mK 8

February 17-18, 2010 R&D ERL Roberto Than 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# g/s F. Power Coupler# g/s Transitions/solenoid 0.3 g/s Total 0.45 g/s Shield cooling: LN2 9

February 17-18, 2010 R&D ERL Roberto Than SRF Gun Cryomodule Relief 10 VOLUMESet Pres psig Load kW Relief Rate Kg/s Req’ Area in 2 Relief Area In 2 MNFA Helium side50.05Relief valve Helium side814 Loss of insulating vacuum to air [3” Disk] UHV side [1.5” Disk] Insulating Vacuum [6” Disk]

February 17-18, 2010 R&D ERL Roberto Than SRF Gun Cathode Tip Cooling 11 LN2 COOLED 50W CONVECTION NUCLEATE BOILING X<10% FLOW: 5 g/s

February 17-18, 2010 R&D ERL Roberto Than Cryo System Diagram 12 LHe supply Vhe Return 2 - 4K FPC 2FPC ENDBORE & SOLENOID END E-CX 5-cell SRF 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 m 3 ) 3500 Liq 17 atm Warm Process Vacuum Pump: 5.5 to 6 g/s, 23 Vertical LN2 Dewar: 11,000 Gal Cryogenic Transfer Lines System 13

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  g/s: 92 W –Gun: 110 L usable  g/s: 35 W Peak Mode –Draw down reservoir –No fill from JT valve –5.5 g/s Vacuum Pump –128 2K Steady State –Constant level reservoir –Fill from JT valve –2K-4K Recovery –5.5 g/s Vacuum Pump –94 2K 14

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 g/s +2.5 g/s Continuous 18 hrs 75 hrs 33 hr 15

February 17-18, 2010 R&D ERL Roberto Than Summary Cryogenic System: 128 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