SHMS Cryogenics and Q2(Q3Dipole) Cool Down

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Presentation transcript:

SHMS Cryogenics and Q2(Q3Dipole) Cool Down Paul Brindza October 12, 2016 11/12/2018 Hall C SHMS Q2Q3Dipoel ERR Review

Hall C SHMS Q2Q3Dipoel ERR Review Cryogenics Top level Cryogenic System is common to JLAB Halls A, B and C All Halls are superconducting End Station Refrigerator(ESR) 1500 Watts Hall A- HRS right and HRS left( 1994) Hall B – Clas12 Torus and Solenoid(2016) Hall C – HMS( 1992)and SHMS( 2016) 11/12/2018 Hall C SHMS Q2Q3Dipoel ERR Review

End Station Cryogenics 11/12/2018 Hall C SHMS Q2Q3Dipoel ERR Review

ESR Helium Refrigerator System ESR system Completely automated system runs 24/7 unattended 1500 watts capacity 10,000 liter LHE local storage 10,000 gallon LN2 local storage 250,000 gallon gas Helium local storage Purifiers- LN2 charcoal scrubbers Cold and warm Connection to Central Helium Liquifier(CHL) for extra capacity and inventory Transfer lines deliver LHE and LN2 to Hall A, B and C 11/12/2018 Hall C SHMS Q2Q3Dipoel ERR Review

Hall C Cryogenic System I Transfer Line from ESR LHE supply and return LN2 supply 20 K He gas supply 25 K Gas Helium return Gas supply and return line to ESR 3.5 Atm gas Helium supply Vapor cooled lead He gas return line Warm He return line for cool downs Exhaust N2 gas vent line to atmosphere 11/12/2018 Hall C SHMS Q2Q3Dipoel ERR Review

Hall C Cryogenic System II HMS system ( 1993) Cools 4 SC magnets( Q1, Q2, Q3 & Dipole) Flex line to permit rotations HMS distribution XFER line- parallel supply/return HMS gas return lines SHMS system( 2014) Cools 5 SC magnets (HB, Q1, Q2, Q3 & Dipole) SHMS distribution XFER line-parallel supply/return SHMS gas return lines Hall C magnet reservoirs have min. 1 hour hold time 11/12/2018 Hall C SHMS Q2Q3Dipoel ERR Review

Hall C SHMS Q2Q3Dipoel ERR Review Hall C Cryogenics III Hall C Cryo-Target system Cools local Hall C cryo-target-3 @ 800 watts Local valve box to select LHE or 20 K HE cooling LH2, LD2 targets at ~ 20 K HE3 gas targets at 4.2 K Hall C Moller Polarimeter- beam polarization 5 tesla SC solenoid to polarize iron foils Transfer line for LHE and LN2 Gas return lines 11/12/2018 Hall C SHMS Q2Q3Dipoel ERR Review

Hall C Cryogenics “block” diagram ESR Hall C Distribution HMS Transfer Line SHMS Target Moller HB Q1 Q2 Q3 D

SHMS Cryogenic Schematics

SHMS Magnet Cooling System Distribution transfer line on SHMS All magnets cooled in parallel independently Internal Cool Down/Warm Up Heat Exchanger He supply at 2.5 Bar 4.5 K He return at 1.2 Bar and 4.4 K LN2 supply 80 K , 3.5 Bar Cool down He gas 3.5 Bar ( 250 K to 80 K) 11/12/2018 Hall C SHMS Q2Q3Dipoel ERR Review

SHMS Distribution System 11/12/2018 Hall C SHMS Q2Q3Dipoel ERR Review

Q2 Magnet P&I

SHMS Cool Down Control Screens 11/12/2018 Q2Q3D ERR Review October 12, 2016

Hall C Magnet Cool Down I 300 K to 80 K cool down Process uses a Hall C Heat Exchanger under local PLC control using sensors in subject magnet Blends 80 K He and 300 K He to make any temperature cold He gas between 250 K and 80 K Process makes 10 Grams/sec cold Helium Consumes 30 Grams/sec LN2 when output Temp is 80 K PLC manages LN2 supply, coolant Temp and interlocks Coolant is 50 K < Magnet temp, Magnet gradients < 50 K Coolant distributed to subject magnet ( HB,Q1,Q2,Q3,Dipole) Q2Q3 take 2 weeks(14 days) Dipole takes 3 weeks(21 days) 11/12/2018 Hall C SHMS Q2Q3Dipoel ERR Review

Cool Down 300K to 80K

Hall C Cool Down Heat Exchanger 11/12/2018 Hall C SHMS Q2Q3Dipoel ERR Review

SHMS Q1 Cool Down

Hall C Magnet Cool Down II Entire process is managed by PLC Magnet Temp below 100 K Introduce LHE at 4.4 K thru “bottom fill” valve in each magnet Internal manifold distributes LHe to far end of each magnet Magnet cools to 4.4 K and starts accumulating LHE LHE rises into reservoir and registers on LL probe Cooling switches to top fill LHE switches to cold return Operator tunes up PID liquid level regulation 11/12/2018 Hall C SHMS Q2Q3Dipoel ERR Review

Cooldown to 4K

Top Fill / Cold Return

Cool Down Logic

Cool Down Interlocks / Controls Event Action Magnet Temperature Delta > 50K Close Supply valve Temperature gradient between HX output and magnet input > 50K Adjust HX output temperature set point, Close Supply valve to magnet. Helium Pressure to High Close Supply Valve, open warm Valve. Helium Pressure below 1 atm Interlock Insulating Vacuum Bad Support Links out of range Close Supply Valve. Adjust tension on links. Flow to Hall C exceeds ESR set point by 0.5 g/s Close supply Valve Helium Cold Return temperature > 6K Close cold return valve, open warm return valve

Cryogenics and Cool Down Summary Hall C cryogenics in continuous service since 1993 for HMS SHMS cryo in continuous service since 2014 Cool Down(CD) System has been in continuous use since 1993 CD System has been copied by Halls A, B and D PLC controls are very mature and have been in continuous service for 15 years 11/12/2018 Hall C SHMS Q2Q3Dipoel ERR Review