ADS injector Cryogenic System ReporterNiu Xiaofei Cryogenic group

ADS injectorⅡ Cryogenic System Reporter：Niu Xiaofei Cryogenic group, IMP 2018 -06 -06

Outline u Introduction of ADS injectorⅡ u Requirements for cryogenic system u Process design u Main component Ø Refrigerator Ø Distribution system Ø Recovery & purify u Operation of the cryogenic system

Introduction of ADS injectorⅡ p ADS: Accelerator driven sub critical system InjectorⅠ IHEP InjectorⅡ IMP

Introduction of ADS injectorⅡ p Component of ADS injectorⅡ(25 Me. V , Cooperate with IHEP ) Ø ECRIS + LEBT + RFQ + MEBT + CM 1(HWR)+ CM 2(HWR)+ CM 3(TAPER)+ CM 4(SPOKE) IHEP IMP 4

Requirements for cryogenic system Superconducting Linear Accelerator facility p Requirements for cryogenic system 25 Mev Cold down time 2 K/h to 100 K, 4 K/h to 4. 2 K Cooling mode Bath-cooled Running pressure in cryomodule 1~1. 25 bara Maximum pressure in cryomodule 3 bara Pressure stability ± 1. 5 mbar Liquid level stability ± 5% Superconducting Cavity Vertical Test facility Cold down time 4 K/h to 100 K, 8 K/h to 4. 2 K Cooling mode Bath-cooled Running pressure 1~1. 25 bara Maximum pressure in dewar 3 bara Pressure stability ± 1. 5 mbar Liquid helium volume 1500 L Liquid level stability ± 5 cm Experiment consecutive time 48 hours Ø Operation requirements • Cooling mode: Bath-cooled, 4. 2 K • Running pressure in CM: 1 -1. 25 bara • Maximum pressure in CM: 3 bara • Pressure stability: ± 1. 5 mbar • Liquid level stability: ± 5% Ø Heat load： 650 W • CM: 600 W Static ： 50 W× 4=200 W Dynamic ： 100 W× 4=400 W • Distribution system： 20 W • Vertical Test: 30 W Ø Refrigerator: 850 W/4. 5 K（W） 77 K（g/s）LN 2 Cryomodule 600 6 Cavity Vertical Test 30 1 Distribution system 20 0. 1 sum 650 7. 1 Design cooling power 850 7. 8 4. 5 KCryo-plant 850 W/4. 5 K 5

Process design p Layout of cryogenic system

Main component p Cryo-plant (LR 280 from linde) Ø Cooling power : 850 W/4. 5 K Ø liquid production capacity: 270 l/h Operation Mode LN 2 pre-cooling W@4. 5 K L/h@1. 25 bara Refrigeration mode With ≥ 957(850) NA Liquefaction mode Mixed mode With NA ≥ 657(550) ≥ 283(270) ≥ 117(100) Refrigeration mode Without ≥ 692 NA Liquefaction mode Without NA ≥ 95 Cold box , dewar Control Surface

Main component p Compressor：FSD 571, CSD 85 Item FSD 571 CSD 85 Mass flow rate@50 Hz(g/s) 95 14. 5 Suction pressure (bara) 1. 05 Supply pressure (bara) 14 14 Motor rated power (k. W) 315 45 Cooling water quantity (m 3/h) Cooling air quantity (m 3/h) 20 6700 NA 9400 Suck pressure: 0. 95 bara, 0. 85 bara in lanzhou High pressure: 13 bara Mass flow: 95 g/s p Buffer tank: 100 m 3&15 bar× 4 p LN 2 tank: 50 m 3& 8 bar Volume Quantity （m 3） Function Design P Working P Design T （MPa） （℃） Material Store Gas/Liquid Type Storage Capacity （m 3） Buffer Tank 100 4 1. 8 1. 45 -10～ 70 Q 345 R Pure Helium Vertical 5800 Storage Tank 33. 3 1 16 15 -10～ 70 Q 345 R Impure Helium Horizontal 5000 Storage Tank 20 1 16 15 -10～ 70 Q 345 R Pure Helium Horizontal 3000 LN 2 Tank 50 1 1. 6 0. 8 　 　 LN 2 Vertical 　 compressor buffer Storage Tank

Distribution system p Distribution Process design Ø Liquid helium supply from Dewar of cold box to the facility Ø Helium Gas return to • Cold box (running) • Recovery system(at the beginning of cooling down) • Low pressure pipe of cryo-plant(cooling down ) Flow diagram of distribution system Layout of cryogenic system with 4 cryomodules

Distribution system p Multi channel pipe Ø 5 valve boxes(20 cryogenics valves) • Total length: 43 m • Total Heat load : 22 W(including valves, bayonets) 4 for Injector Ⅱ 1 for vertical testing ØVacuum barrier Øliq. Nitrogen (aluminum thermal shield) ØLow heat load support The structure of multi channel pipe Assembling of multi pipe Valve box Connecting to CM vacuum 10 leak detection

Recovery & purify Specifications of recovery system p Recovery & purify Flow diagram of recovery system Recovery compressor purifier 1 Impure helium tank 5000 m 3 2 Pure helium tank 3000 m 3 3 4 Working pressure Purification flow 150 bar 100 Nm 3/h 5 Purity out of the purifier ≥ 99. 999% 6 7 8 Duty cycle Regeneration cycle Operating temperature ≥ 10 hours ≤ 10 hours 77 K 9 Operation mode Manual / Automatic • From 2013 to now, more than 20000 m 3 helium gas has been recovered and purified • System runs steadily Gas bag 11 Helium storage tank

Operation of the cryogenic system p Controlling Ø Temperature, pressure, helium level can be read and written Ø Pressure : 1. 05 bara± 1. 5 mbar Pressure：Maximum：± 1. 5 mbar Ø Helium level 200 mm± 10% Normal：± 1. 0 mbar Best： ± 0. 5 mbar 12

Operation of the cryogenic system p Running Vertical testing Valve box Cryo -module Helium pipes Cold box Helium Dewar Ø By the end of 2016, ADS injector II got 1. 16 m. A@10. 06 Mev (CW mode) proton beam current with 2 cryomodules. And the Cryogenic System runs steadily. Ø At the middle of 2017, 4 cryomodules have been installed, and ADS injector II get 170μA@25 Me. V(CW mode) Ø The cyo-System has been running steadily more then 30000 13 hours;

14