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Long Shutdown Activities

Detailed activities including sensor replacement, cryostat maintenance, pressure gauge installation, and collaboration projects at ILL from September to December 2017.

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Long Shutdown Activities

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  1. Long Shutdown Activities September – December, 2017 Yegor Vekhov

  2. Activities • ICE Dil Fridge: • Minor cart modifications • Vacuum and cold tests inside new MACS 3He ILL • ILL Orange Cryostats: • General maintenance • Cables, electrical feed throughs, vacuum valves, pressure relief valves, needle valves, O-rings, LHe sensors, etc. • Tests • Cold tests under warm valve control and under dynamic pump control – 4 ILLs - 4 weeks • Upgrades • Diode sensors replacement – 11 cryostats (disassembling the tail, sensor replacement, assembling, vacuum test, cold test) – 11 weeks • Installation of new Pirani pressure gauges for ILLs • Helium level sensors replacement (5 ILLs) • Ordering new cables • Repairs • ILLs #3, #5, #13 – base temperature is > 1.6K, assessing potential issues during tail disassembling for diode sensors replacement • ILL #3 (70mm, short) – looking for a ‘ghost’ leak – 2 weeks • Finishing SANS-2 ILL – 2 weeks • ILL sample sticks • Test all, 22, ILL sample sticks: fix temperature points at 77K and 4.2K • Housekeeping and safety • Tool boxes (restock) • Carts maintenance • Cleaning storage boxes • HZB and ISIS visits – 7 weeks

  3. ILL - Diode Sensors Replacement for 11 Cryostats WHY?

  4. ILL - Diode sensors replacement for 11 ILLs

  5. ILL – Pirani Pressure Gauge

  6. ILL – Pirani Pressure Gauge MKS925 • Calibrated for He gas • Robust metal body • Computer interface • Bright touchscreen display • Torr and mbar units, etc…

  7. ILL – Pirani Pressure Gauge

  8. ILL – Helium Level Meter Sensors Replacement for 5 ILLs Brand new sensors

  9. ILL – Finishing SANS-2 ILL project for Dil Fridge experiments at SANS

  10. ISIS visit • Experience exchange in low temperature and high pressure: • sample change and cooling procedures, • equipment (Dil fridges, ILLs, magnets, sample cans) • ancillary low temperature equipment (pumps, controllers), etc. • Calorimetric measurements of neutron induced sample overheat

  11. ISIS visit High pressures at low and ultra-low temperatures Edinburgh Sputnik sell on E-18 dilution fridge Collaboration: University of Edinburg, ISIS Sample Environment and WISH teams Ability to change pressure at ~ 6K Ruby luminescence in-situ pressure measurements Pressure: up to70 kbar (7 GPa) Sample size: 1 mm3 Lowest temperature:less than 150 mK Magnetic field up to 4T Detector side of laser printed collimator, coated in Gd2O3 paint and fitted to pressure cell The cell mounted on E-18 Dilution Refrigerator Mixing Chamber plate Design and test results were published in: Rev. Sci. Instrum. 86, 095114 (2015)

  12. ISIS visit Calorimetric measurements of neutron induced sample overheat Down to 30mK Neutron absorber (Copper, Aluminum) Groove for heater wire Helium-3 RuO2 sensor Made in Ukraine Will be made at NCNR

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