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

Division of accelerators, cryogenics and magnetism

Institute of research into the fundamental laws of the Universe