02/07/2017 Coordination Meeting

Attendance

Creel, Wright, Schleeper, Fair, Kashy, Bridza, Fansler, Gomez, Oren, Butler, Wood

Agenda and Notes

This meeting is to discuss the ESR capacity usage by the Halls.

1. ESR History

Plant originally built in 1978 for the LBL ESCAR Project. It operated < 900 hours before being shutdown.

Plant was moved to JLAB and installed in 1994 JLAB to support Hall's A, B, and C. The plant has been in nearly continuous operation for 22 years.

2. ESR Capacity

Plant capacity envelope (1500W at 4.5K) OR (800W at 4.5K PLUS 1200W at 15K)

Additional TRANSIENT capacity available from CHL via transferline of up to 20g/s at 4.5K

A general thumb rules, ESR loses 1 Watt of 4K Refrigeration for every 3 watts of 20K refrigeration. Also, 1 g/s of liquefaction costs 150 Watts of 4K Refrigeration.

3. ESR2 Upgrade

Cryogenics group has been pushing the installation of the ESR2 4KW at 4.5K SSC plant for more than 15 years. The building was constructed and the cold box placed inside it but the real work of designing, installing, and commissioning keeps getting bumped because of funding. This is a multi year effort to complete this work.

4. Current Issues

At this time the ESR is operating above its capacity. The CHL1 is supplying about 10g/s to ESR at this time. If the transferline is shutdown the ESR Dewar level falls. We called the meeting to discuss the operation of the Halls and ESR. Also note for this summer, because of maintenance plans at the CHL's the transferline will not be available for this summer. Cryo's worry is operating the ESR at full discharge pressure places more wear and tear on the equipment. Using the tranferline also links the risk of both plants together and increases the recovery time following an esr or chl trip. This meeting was to discuss options and arrive at an agreed plan.

5. Plan Forward

Hall B has submitted the KPP data to DOE for approval. Approval should come in a few days and then we could park the Torus at 80K. Kashy's apprehension is he reported the Torus is operating differently after the last 80K warmup. He reports the JT is no longer flowing enough to provide liquid to the magnet and it acts like there is a partial ice plug in the line.

Paul says HMS might be able to park at 80K for the summer .Hall C warm return will be routed to CHL. Hall B warm return will be routed to CHL.

Creel reported the possibility of requesting an ESR shutdown for summer of 2018 to perform maintenance and upgrades. This might be a time to warm all of the Hall magnets and piping for a system clean up.

Action Items

1. Finish the ESR2 design, fabrication, and commissioning ... quickly.

2. Kashy will provide lead flow values to Schleeper to improve the load estimates.

3. Cryo will revisit the capacity matrix predictor and bounce it against the wants of the Hall's.

4. Kashy recommended a test before the end of the run to see where the actual loads are with respect to ESR/CHL capability. This could happen as early as next week.

5. Brindza indicates Hall C is having a serious pressure drop issues on the cold return for the SHMS system. Possibilities are its because of the flow and pipe size, it could be a valve that is not full open, it could be a partial plug in their lines.

6. Cryo might request an ESR shutdown and warm up to 300K to perform maintenance and repairs and clean up the Halls.