LEAS

 

The Laboratory for Superconducting Magnet Research (LEAS) offers its expertise in magnetic fields to IRFU physicists and is staffed by eight technicians, 17 engineers and one PhD student as of December 2012. The laboratory teams are responsible for the design and project management of superconducting magnets for experimental facilities, especially large magnets or those with high magnetic fields.

 

In the design of superconducting magnets, LEAS applies its expertise to the optimization of coil geometry, conductor design, mechanical, electromagnetic, and thermal calculations, and magnetic protection in the event of quench. In addition to designing magnets, LEAS has the capacity to manage large projects, to develop magnets and integrate them into cryostats, and to provide monitoring for industrial projects. The magnets are inspected jointly with the Cryogenics Laboratory and Test Station (LCSE). Measurement work includes analyses of tests at ambient and cryogenic temperatures, including quench analyses and magnetic measurements.

 

The R&D work carried out is partly in response to the requirements of construction projects such as the GLAD dipole in the R3B spectrometer and the ISEULT imager. Also, in view of the future development of the LHC, development work is being carried out on the use of niobium tin (Nb3Sn) and high critical temperature superconductors. The use of magnesium diboride (MgB2) conductors is also being studied.

 

 

 

 

Last update : 03/16 2018 (735)

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CRYOPULSE : Horizontal cryostat 6 m in length for characterizing flows and thermal performance by means of temperature and pressure measurements in cryogenic pulsating heat pipes up to 4 m in length. Power available for the loop: 200 W.
Diagnostics, vacuum and assembly laboratory (DIVA) : The laboratory is responsible for vacuum measurement, for research into the desorption of materials and the development of ultra-high vacuum techniques (assemblies and tests). Its equipment includes: ? An ultra-high vacuum oven that can reach temperatures up to 1200 °C at 10-6 Pa, with temperature uniformity at 900°C of ± 3°C. ? A desorption measurement bench for qualifying materials and developing cleaning procedures necessary for ultra-high vacuums.
Double bain : A cryostat using the Claudet double bath principle, for carrying out thermal studies on static pressurized superfluid helium up to a power of 10 W at 1.8 K with a maximum pressure of 1.5 bar(a) in a test volume of dimensions of diameter 200 mm x height 200 mm  
Insulation/impregnation laboratory : The insulation/impregnation laboratory provides technical support for SACM’s projects on insulation for superconducting magnets and their winding: production of small coils, impregnation of prototypes or characterization samples, preparation of superconducting cables prior to characterization by dissolving aluminum or copper, use of resins and chemicals, room temperature characterizations (calorimeter, tensiometer, rheometer, pycnometer), etc.
Measurement of Kapitza resistance and thermal conductivity :   Cell for measuring Kapitza resistance and thermal conductivity in superfluid helium between 1.7 K and 2.1 K on thin samples (0.5 mm max), up to 80 mm in diameter.  
Measurements in pressurized superfluid helium at 1 atm : Double bath NED cryostat. Volume at 1.8 K: Diameter 250 mm x Height 300 mm.   Double bath Th0 cryostat. Volume at 1.8 K: Diameter 200 mm x Height 500 mm.
The SEHT test facility : The SEHT facility, which was created to generate an 8 T magnetic field in a large volume, uses a solenoid winding with an NbTi conductor assembled from double pancake coils cooled in a superfluid helium bath at 1.8 K and 1.2 bar absolute. The SEHT solenoid is a reconditioned superconducting coil previously used in the 35 T hybrid magnet at LNCMI in Grenoble.
THERMAUTONOME : A circulation loop with recondensation by means of a cryogenerator, for characterizing single phase and two-phase flows by measuring pressure drop, and wall temperature increase along the wall of a 30 cm vertical test section. Cryogenerator: 1.5 W at 4.2 K. Pressure: from a few mbar to 3 bar. Temperature: from 3 K to 30 K. Max Power in the loop: 4 W at 10 K.

 

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