MQXFAP 1 Quench Recovery A Marone 12417 Quench

MQXFAP 1 Quench Recovery A. Marone 12/4/17

Quench Summary Quench I (A) Energy into coil (MJ) Helium mass flow @ 2 seconds after rupture (g/s) 2 15440 2. 96 1750 3 15916 3. 20 2150

Quench 2 Graph

Quench 3 Graphs

Short Term Solutions Proposed Relief Stack • Redesign relief stack to protect burst disc. o Increase to 3” IPS. ( from 2” IPS) o (1) Cash C-776 ( 2”) relief valve 25 psig Set point • Capacity 1380 g/s @ 30 psig. o (2) Magnetrol 2” fast acting solenoid valves. • Capacity 1400 g/s @ 30 psig. o Total relieving capacity 4180 g/s @30 psig ( 5115 g/s @ 40 psig) o Time to complete ( 3 weeks)

Short Term Solutions Cold Storage • Use Test Dewar 3# ( about 6 feet away) as cold helium storage. o Connect in series with test dewar with a VJ transfer line. o Would add 2. 2 cubic meters of cold helium storage. o This would allow for about 30 KG of additional cold helium storage (@ 30 psig and 9 K) • Liquid Helium contained in test dewar about 87 kg. o Most plumbing already set up. o Need transfer line between dewars and additional Transfer line to keep some liquid in the dewar. o Estimate 5 -6 weeks to complete.

Cold Storage

Long Term Solutions Increase Recovery Capability • Increase piping size to 6” to quench valve, then 10” out to recovery tanks. • Move 30, 000 gal. tank closer to test facility. • Possibly add another existing tank (on site)to lower final tank pressure.

Summary • Peer Reviews are ongoing (R. Than- BNL, R. Rabehl. FNAL). BNL Cryo. Safety Committee review also needed. • Now (3 -4 weeks) o Increase relief capacity to 4180 g/s @ 30 psig to avoid burst disk rupture. o Increase fast logger window to capture entire event. • Add second dewar as cold storage (6 weeks). o Need transfer line between dewars. o Can significantly reduce helium loss. o Cost 10 K-20 K • Long term o Collect data on quenches as they occur. o Upgrade recovery line to 10” • Will reduce pressure buildup in test dewar. o Move 30, 000 gal tank closer to facility.

Backup Slides

Quench #2 (11 -13 -2017) • • Current at quench; 15440 Amps (3. 93 MJ) Energy deposited into coil; 2. 96 MJ ( 25% extraction) Time from Quench to Burst disc rupture; approx. 13 s. At time of burst disc rupture; rating 40 psig. o Estimated flow into quench tanks 500 g/s ( from gage pressure readings). o Anderson –Greenwood relief valve set at 30 psig never relieved. • Calculated mass flow 2 seconds after rupture o Through burst disk ( 1400 g/s) o Through quench system ( approx. 350 g/s)

Quench #3 (11 -15 -2017) • • Current at quench; 15916 Amps (4. 18 MJ) Energy deposited into coil; 3. 20 MJ ( 23% extraction) Time from Quench to Burst disc rupture; approx. 16 s. At time of burst disc rupture; rating 40 psig. o Estimated flow into quench tanks 550 g/s ( from gage pressure readings). o Anderson –Greenwood relief valve, set pressure reduced to 10 psig (valve actively relieving at time of rupture). Calculated flow 390 g/s. • Calculated mass flow 2 seconds after rupture o Through burst disk ( 1650 g/s) o Through quench system ( approx. 500 g/s) • 4 seconds after rupture flow rates match that of quench #2 , 2 seconds after rupture.