Cryogen Ground Support Equipment CGSE for the Superconducting Magnet of AMS 02

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Cryogen Ground Support Equipment (CGSE) for the
Superconducting Magnet of AMS 02

• Presented by Alexander GRECHKO (Kurchatov
  Institute)

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Main CGSE Requirements

• Cold mass (magnet, He vessel, etc.).. 2000
  kg
• Temperature range of cooling..300 - 1.8
  K
• Max. temperature gradient during cool down
• at the range 300-90 K50 K
• Kind of magnet cooling..indirect
• Volume of magnet helium vessel. 2500 l
• Max. pressure in helium vessel1.6 bar
• Movableyes

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Principle of Cooling
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CGSE Principal Scheme
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Liquid He and N2 Consumption for One Cool Down
and Filling with SFHe
Estimation using mcold 2000 kg, VHe 2.5 m3
and ideal case without losses. For redundancy the
numbers of consumptions should be multipled by
factor 1.5
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Cool Down Time Estimation for 300-4.2 K
Calculated for two 4 mm ID AMS valves in series
and maximal flowrate 2 g/s
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Cool Down Time Estimation for 4.2-1.8 K
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CGSE for Launch Pad (top-up of SFHe)
Flow rate of SFHe top-up 40-100 l/h
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CGSE During Thermal Vacuum Test in LSS (Large
Space Simulator) at ESA/ESTEC
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List of CGSE Systems and Devices

• System for controlled cool down and warm up in
  the temperature range 300-80 K
• System for filling Superfluid Cooling Loop of AMS
  magnet with liquid He
• Vacuum pump system
• Liquid He Dewars
• Liquid nitrogen tank
• Valve distribution box
• Cleaning system for removing impurities from the
  system and providing high purity of He flow
• Measuring and control system
• Cryogen pipes and armature
• Cryostat - Simulator of AMS

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System for Controlled Cool Down and Warm up in
the Temperature Range 300-80 K

• Cryostat with heat exchangers, liquid nitrogen
  bath, valves and heater
• Clean helium compressor system with total
  capacity about 2 g/s. Main feature without
  contamination of circulating He with any
  impurities (oil, water, air)
• Warm helium supply (battery of cylinders with
  pressurized gaseous He) for compensation of
  increasing He density during cool down (4
  standard 40 l cylinders)
• Liquid nitrogen supply

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KNFs Membrane Compressor
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System for Filling Superfluid Cooling Loop of AMS
Magnet with Liquid He

• Warm helium supply - battery of cylinders with
  pressurized gaseous He or He gasification system
  (7 standard 40 l cylinders)
• Reducer of pressure and valve for control
  pressure at the output not more 2 bara
• Oscillation damper
• Sensors (pressure and gas analysis)
• Output to the cleaning system

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Leybold RUTA 2001/SV630 Vacuum Pump Technical
Data
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Leybold RUTA WAU 2001/SV630

• Pumping speed diagram

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Dimensional Drawings for the Vacuum Pump
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Cleaning System

• Helium leak detector
• For-vacuum pump with capacity 50 l/s and vacuum
  10-3 mm Hg
• Warm helium supply (battery of 12 cylinders with
  pressurized gaseous He)
• Set of flexible piping and valves
• Connection to the gas analysis system

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Measuring and Control System Requirements

• Gas analysis system for control of He purity.
  Requirements to purity of He nitrogenlt10-5 ,
  neonlt10-5 , hydrogenlt10-5 , hydrocarbonslt0.1
  ppm
• For system 300-80 K Flow rate of He. Range of
  measurement 0.5-2.5 g/s Controlled mixing of
  cold and warm flows to provide required
  temperature difference (no more 50 K) between
  magnets input and output of helium flow Control
  of the level of liquid nitrogen Control power of
  heater H1 to maintain helium output flow
  temperature not less 290 K (the same for heaters
  H2, H3)
• He flow temperature sensors (8 points of
  measuring)
• Pressure sensors (6 points).
• Capability to display sensors read-out and state
  of the system, capability of writing sensors
  readout into memory that it will be possible to
  see changes of parameters by time and for data
  archiving.
• Capability to control the valves
• Sensors and valves that locate near AMS magnet,
  must work in magnetic field
• Capability to monitor magnet temperatures
  (interface TBD)
• Warning and alarm conditions to be recognized and
  displayed
• Capability to abort cool down safety under alarm
  conditions
• Capability to readout signals from AMS cryogen
  sensors (temperatures, level of liquid helium,
  etc.) and control of AMS valves (to be discussed
  with SCL)

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Liquid He Dewars and Liquid Nitrogen Tank
Requirements

• One 1000 l LHe Master Dewar with high vacuum
  tightness with capability to pump LHe to 2.3 K
  (vacuum 50 mbar abs)
• 3 - 5 standard replacement 1000 l He Dewars for
  work with normal LHe (4.2 K)
• Standard 3500 l liquid nitrogen tank

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Liquid Helium Dewar
Technical Data Net Capacity
(ltr) 950
Diameter (mm)
1400 Height (mm)
1765 Weight Empty (kg)
650 Weight Full LHe (kg)
770 Maximum Working Pressure
(bar) 0.5 Static Evaporation Rate ( per
day) 0.4
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Tank for Liquid Nitrogen

• Technical Data
• Capacity (ltr)
  3500
• Length (mm)
  3750
• Diameter (mm)
  1500
• Height (mm)
  1725
• Weight Empty (kg)
  1500
• Weight Full LN2 (kg)
  4330
• Maximum Working Pressure (bar) 3.0
• Static Evaporation Rate ( per day) 0.6

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Valve Distribution Box

• To place cold cryogen valves in one box
• Filter for LHe with regeneration in situ
• Heater for warming up helium flow to the room
  temperature

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Main LHe Filter Principal Scheme

• Requirements to the filter
• Destination filtration of liquid helium to
  remove solid particles of oxygen, nitrogen, neon,
  hydrogen
• Filtration grade 2 ?m nominal
• Pressure drop less then 10 mbar for 5 g/s of
  liquid helium at the temperature 4.2 K and
  pressure 1000 mbar abs. Operating pressure 1.5
  bar
• Operating temperature 1.8 400 K
• Material CrNi-Steel, 1.4401 / AISI 316
• Test Bubble Point Test und Glass Beads
• Filtering medium Fuji Filter
• Capability for recovering by heating and
  expulsion with clean GHe. Time of heating 20 min.
  
• Control of the temperature of the filter
• Control of the pressure drop on the filter

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Cryogen Pipes and Armature Requirements

• As low as possible heat flux to the helium flow
  (especially to liquid helium from Dewar to AMS
  magnet), flexibility, possibility to change
  length if needed (by adding pieces), convenient
  for mounting and dismounting, supports for valves
  and pipe (no loading allowed on AMS magnet
  construction and fill ports).

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WEKA Valves
General view

• Features
• Bellows sealed
• Pneumatic membrane actuator
• Electropneumatic positioner
• Low heat leakage

Heat leakage
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Cryostat AMS simulator

• 
  

• Destination to test GSE without AMS magnet at
  all modes of work before shipping to SCL, Culham
• 5 ports for helium flows inputs outputs
  exactly the same as for AMS magnet
• Simulation of hydraulic resistance of AMS magnet
  by 4 mm ID cold valves and 4 mm orifices
• Adjustable in the range 0-600 W heater as heat
  load
• Simulation of superfluid cooling loop (SCL)
• Simulation of controlled warming up and cooling
  down of the magnet by 25 kg of aluminum
  (optional)
• Volume of vessel for liquid and superfluid
  helium 250 l (one tenth of AMS volume)

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CGSE Schematic Layout
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CGSE Schematic Layout for Launch Pad