Eight Tesla Test Station (SEHT)

8 T coil in the SEHT test station.

Context

Test of components under magnetic field (B ≤ 8 T).

The SEHT station produces a homogeneous magnetic field in a vertical test zone with a large diameter (useful diameter of Φ= 587 mm at T = 300 K) which can accommodate components at room or low temperature (T ≥ 1.8 K).

Technical means

The SEHT station has a dedicated magnet and associated systems including in particular a stabilized power supply (I < 1000 A) and an operational Magnet Safety System (MSS) based on recent technology equipment.

The SEHT station uses a solenoid winding which consists of stacked double pancake coils wound with NbTi conductors.

As of today's date, the refrigerator is not available. Different possibilities are currently explored to supply the station with liquid helium. The station has a dedicated helium pumping group which allows it to work with pressurized superfluid at T = 1.8K.

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).

View of the entire SEHT station in Building 198.

Achievements, related projects

Validation tests of technological concepts were performed in this station in the framework of the ISEULT project. The objective was to validate technological concepts such as cryogenics at T = 1.8 K, electrical circuit, control system, conductor, protection and mechanical resistance of the future magnet under magnetic field, principle of stabilization and magnetic screening.

In general and as performed during the ISEULT conductor stack tests, the SEHT station allows to test cryomagnetic components (for example: quadrupole or dipole coils) under a magnetic field and with current to check the good behavior of the superconductor over time when subjected to high electromagnetic stresses. The station also offers the possibility of placing any other device under a controllable magnetic field.

Technical steps, expertise

Possible mechanical adjustments in order to install the component to be tested,
Startup of the station and setting up of the instrumentation (measurement chains, electrical circuit connections …),
Vacuum setting,
Conditioning of the circuits (purge, rinsing, check of the measurement channels ...),
Startup of the cryogenic system, cooling of the magnet,
Check-up of the Magnet Safety System (MSS),
Securing of the area (markup),
Magnetic field rise (field measurement, check of the field map when there is a sample which might affect the field generated by the solenoid),
Tests on the sample.

Contact: AMICI@cea.fr

#3984 - Last update : 07/21 2017

Division of accelerators, cryogenics and magnetism

Institute of research into the fundamental laws of the Universe