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R&D ERL Cryogenics

This document provides an introduction to the cryogenics system used in the ERL research and development, including details about the e-CX 5-cell cavity cryomodule and the SRF gun cryomodule. It also discusses the cold cathode cooling and the overall operation of the cryogenic system. The thermal loads and equipment specifications are outlined, along with the timeline for installation and check-out.

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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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