Vertical station
Context
Tests of large magnet components (h ≤ 7.9 m, Φ ≤ 882 mm) at low temperature (in liquid helium or under vacuum, T ≥ 4.2 K).
Note that T = 4.2 K is the current temperature limit. Future tests performed in the framework of a LHC / CERN project (study of the Q4 quadripole) will require cooling down to T = 1.9 K.
Technical means
- Power supply: 20 000 A, 5 V.
- Vertical cryostat features :
- Dimensions: maximal height under vacuum: h = 7.9m (of which 7 m at 80 K), useful diameter: Φ = 882 mm.
- Vertical cryostat with nitrogen shield. One part of the internal volume can contain another fluid (liquid helium, for instance). If the component to be tested is small (h < 7m) and can be immersed in a low volume of liquid, one can use another cryostat with smaller dimensions (the height of the cryostat currently used is: h = 3 m).
- As of today's date, the refrigerator is not available; tests are performed with liquid helium dewars. Different possibilities are currently explored to supply the station with liquid helium. The station could work in superfluid regime at 1.8 K by adding a pumping group.
- Additional facilities :
The station is located under two cranes (m ≤ 10 t for the first one and m ≤ 50 t for the other one, hook height of h = 11 m).
Achievements, related projects
- Compact Muon Solenoid (CMS) Detector in the framework of the LHC/CERN project: study of the flow distribution in a multitube thermosyphon,
- Superconducting magnets for the KaTriN experiment,
- Liquid helium circulator of the ATLAS detector barrel for the LHC/CERN project,
- MGB2 magnet (ongoing project),
- Q4 quadrupole for the LHC/CERN project (future project).
Technical steps, expertise
- Set-up of a Magnet Safety System (MSS) and a Magnet Control System (MCS) adapted to the magnet to be tested,
- Positioning of the magnet under the mounting plate, fluid, energy, diagnostic adjustment and junction,
- Adjustment and tuning of measurement and security chains,
- Positioning of the plate-magnet ensemble in the cryostat,
- Connection of the measurement systems,
- Check of the magnet behavior at high temperature and / or under vacuum,
- Conditioning of the high intensity electric supply,
- Cooling by transferring cryogenic fluid with monitoring of the parameters,
- Implementation of the testing programme,
- Warming up.
Contact:
#755 - Last update : 07/21 2017
