Cryogenics Mathew Wright Cryogenic Systems Operations Engineer 1

Cryogenics Mathew Wright Cryogenic Systems Operations Engineer 1. 1. 4. 6 Cryogenic Maintenance and Upgrade Plans CEBAF Cryogenics and SRF Workshop Jefferson Lab April 3, 2014 Thomas Jefferson National Accelerator Facility Page 1 CEBAF Cryo & SRF Workshop April 3, 2014

Outline • 2014 Summer Maintenance • Task List • Examples • Budget/Cost Estimates • Schedule • Helium Inventory • Spares • CHLII • Future Maintenance • Linac’s on one CHL @ 2 K Thomas Jefferson National Accelerator Facility Page 2 CEBAF Cryo & SRF Workshop April 3, 2014

Task List Thomas Jefferson National Accelerator Facility Page 3 CEBAF Cryo & SRF Workshop April 3, 2014

Task List • Task List (2014 Summer) • Add a vaporizer to the CHLI main cold box (MCB) • Clean HX 1 in the CHLI MCB • Replace and regenerate the carbon in the CHLI main carbon bed (the one outside). This job requires many months of clean-up • Modify insulating vacuum piping for the CHLI MCB • Install a super Conducting helium liquid level probe to CHLI MCB sub-cooler (HX 9 a) • Repair oil leak on CHLI main compressor C 4 • Clean water side of all main compressor oil/water heat exchangers • Remove the old purifiers (to make room for the new vaporizer) • Install the LINAC low pressure relief system (hurricane reliefs) • LN 2 dewar fill station over pressurization prevention modifications Thomas Jefferson National Accelerator Facility Page 4 CEBAF Cryo & SRF Workshop April 3, 2014

Add a vaporizer • To prevent the temperature of the LN 2 boiler becoming dangerously low during 2 KCB Pump Downs damaging the LN 2 boiler and shutting down CHLI cryo systems • To shed capacity during off normal operations (CHLI @ 4 K) • It is a problem now because we are pumping one LINAC vs two LINAC’s Thomas Jefferson National Accelerator Facility Page 5 CEBAF Cryo & SRF Workshop April 3, 2014

Clean HX 1 in the CHLI MCB • Reduce the amount of wasted LN 2 • Outlet temp of med pressure header cold causing carbon pipes to sweat and rust all the way to the compressor room and sometime get below the allowable temperature limit Thomas Jefferson National Accelerator Facility Page 6 CEBAF Cryo & SRF Workshop April 3, 2014

Modify vacuum piping for the CHLI MCB • Presently can only pump on the vacuum space through the diffusion pump • Need extra vacuum port to be able to attach external pump like what is on CHLII CBX • CHLI main CBX vacuum was leading cause of downtime at the end of 6 Ge. V Thomas Jefferson National Accelerator Facility Page 7 CEBAF Cryo & SRF Workshop April 3, 2014

Regenerate CHLI Carbon Bed • This job requires many months of carbon drying process • Life of carbon bed design ~8 year • Installed 2004 • Oil Carry over into CBX causes wasted LN 2, rusty pipes, and if bad enough, will shut down the CBX Thomas Jefferson National Accelerator Facility Page 8 CEBAF Cryo & SRF Workshop April 3, 2014

Remove the old purifiers Thomas Jefferson National Accelerator Facility Page 9 CEBAF Cryo & SRF Workshop April 3, 2014

2014 Budget/Cost Estimates • Material Cost Estimates based on Vendor Quotes Thomas Jefferson National Accelerator Facility Page 10 CEBAF Cryo & SRF Workshop April 3, 2014

Schedule Thomas Jefferson National Accelerator Facility Page 11 CEBAF Cryo & SRF Workshop April 3, 2014

Schedule Thomas Jefferson National Accelerator Facility Page 12 CEBAF Cryo & SRF Workshop April 3, 2014

Schedule Thomas Jefferson National Accelerator Facility Page 13 CEBAF Cryo & SRF Workshop April 3, 2014

Spares • Typical Needed Compressor Body, Motor, Oil Pump Motor • Spare compressor bodies (6 -9 month lead time after PO) • Spare motors (9 -12 month lead time after PO) • Warm helium piping cross connects between CHLI and CHLII • If a CHLII system compressor goes down • If one down – 4 K • If two down – 300 K • Recommendation • New C 6 compressor skid • Two spare compressor bodies (CHLII C 1 -C 4) • One 800 HP motor (CHLII C 1 -C 4) Thomas Jefferson National Accelerator Facility Page 14 CEBAF Cryo & SRF Workshop April 3, 2014

Linac’s • One CHL supporting LINAC’s @ 2 K • Add a large cryo valve on spare 9” bayonets • Need to evaluate if we need to switch CHLI/CHLII with the South/North LINAC’s • Unreliable and marginal heater/capacity problems • Process modifications at CHL? • Add 1. 5 k. W external heater? • Needs more process analysis Thomas Jefferson National Accelerator Facility Page 15 CEBAF Cryo & SRF Workshop April 3, 2014

Future Maintenance • CHLI future maintenance • Leftover from List • CHLII future maintenance • Dewar Vacuum • CBX Vacuum piping / system • Warm Gas Tie-In • New Compressor Skid (C 6) • LINAC • Guard Vacuum Pumps Need Replacement Thomas Jefferson National Accelerator Facility Page 16 CEBAF Cryo & SRF Workshop April 3, 2014