Inter University Accelerator Centre, New Delhi

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Presentation transcript:

Inter University Accelerator Centre, New Delhi Study of inter stage cooling for enhancement of LHe production with a GM cryocooler Anup Choudhury, Santosh Sahu - (IUAC) Lokesh Posa, Navneet Suman - (NITR) ICEC26 - ICMC2016 7-11 March, 2016

Inter University Accelerator Centre, New Delhi Motivation Technical challenges Inter stage heat transfer studies Liquefaction studies conclusion Plan of talk ICEC26 - ICMC2016, 7-11 March, 2016

Inter University Accelerator Centre, New Delhi Motivation Oxford make cryostat rejuvenation. Evaporation rate measurement (12 lpd). Experience available with cryocooler LN2 liquefier and LHe re-condensor. Literature survey. ICEC26 - ICMC2016, 7-11 March, 2016

Inter University Accelerator Centre, New Delhi Specifications:- Liquid Capacity = 30 liters Magnetic field = 8 T VTI insert = 1.5 K – 350 K Evaporation rate = 12 lpd of LHe capacity Oxford cryostat Static heat load measurement of Oxford cryostat ICEC26 - ICMC2016, 7-11 March, 2016

Inter University Accelerator Centre, New Delhi Helium recondensor Specifications 1. Cryocooler cooling capacity = 260 W @ 80 K 2. Cryocooler made by Cryomech, USA 3. Cryocooler model no :AL300 (50 Hz) 4. Dewar capacity = 250 liters 5. Nitrogen purity >= 98% 6. LN2 production capacity = 64 lpd Cryocooler based LN2 liquefier ICEC26 - ICMC2016, 7-11 March, 2016

Inter University Accelerator Centre, New Delhi Thermal study of inter-stage of GM cryocooler US PATENT NO ICEC26 - ICMC2016, 7-11 March, 2016

Inter University Accelerator Centre, New Delhi 8K, 20 lpd 40K, 5 lpd 1st stage 35 W @ 50 K 2nd stage 1.5 W @ 4.2 K Technical challenges : How much enthalpy is available in the inter-stage area? How the enthalpy can be extracted? Sumitomo cryocooler SRDK 415 ICEC26 - ICMC2016, 7-11 March, 2016

Inter University Accelerator Centre, New Delhi Extra cooling effect available in inter-stage 300 K 50 K 10.67 K L He (17.44 lpd) 5 W LHe (more than 25 lpd) 7 K 9 W ICEC26 - ICMC2016, 7-11 March, 2016

d Inter University Accelerator Centre, New Delhi 32.5 W T1 T2 Pex T3 Baffle heating experiment in vacuum ICEC26 - ICMC2016, 7-11 March, 2016

Inter University Accelerator Centre, New Delhi 1st baffle heating 2nd baffle heating 3rd baffle heating Result of baffle heating experiment in vacuum ICEC26 - ICMC2016, 7-11 March, 2016

Inter University Accelerator Centre, New Delhi Schematic Details of expt. ICEC26 - ICMC2016, 7-11 March, 2016

Inter University Accelerator Centre, New Delhi Heater on 17.4 lpd Cooldown curve for the liquefier (Best scenario) ICEC26 - ICMC2016, 7-11 March, 2016

Inter University Accelerator Centre, New Delhi 1 2 3 Expt. No Description T6 (K) Production rate (lpd) 1. Basic coaxial design with HX-1 and HX-2, no nylon cover for regenerator. 45.3-45.9 17.4 2. Basic coaxial design with HX-1 and HX-2, and nylon covers for regenerator. 40.7-41.7 14.1 3. Repeat of expt. no 1 with HX-2 removed. 45.4 - 46.7 17.0 4. Repeat of expt. No 1 with both HX-1 and HX-2 removed. 60.2-60.8 16.8 - Best scenario - Worst scenario ICEC26 - ICMC2016, 7-11 March, 2016

Inter University Accelerator Centre, New Delhi Inter stage cooling capacity map fully configured. Liquefaction run undertaken for various HX configuration. Maximum production rate achieved = 17.4 lpd in natural convection mode. Possibility of production increase exists with baffles attached to the inter stage area. Conclusions ICEC26 - ICMC2016, 7-11 March, 2016

THANKS FOR YOUR ATTENTION Inter University Accelerator Centre, New Delhi THANKS FOR YOUR ATTENTION ICEC26 - ICMC2016, 7-11 March, 2016