ºÚÁÏÉçapp

Cryogenic temperature chains and flowmeters are small devices that will convey accurate measurements of magnet temperature and helium flowrate from their positions inside the magnet structures, terminals and supply lines (feeders). This data is critical to ensuring that the magnets are operating under well controlled and reliable conditions, and that helium flow distribution to the magnets is correct.

The measurement solutions are based on proven technologies, augmented by specific development to meet ºÚÁÏÉçapp's challenging performance and environmental constraints.

Two separate contracts were placed in 2014 with the French Alternative Energies and Atomic Energy Commission (CEA Grenoble) for this work, carried out under the supervision of ºÚÁÏÉçapp Magnet Instrumentation and In-Vessel Coil Section.

The first order was for 2,200 cryogenic temperature chains¡ªthree-part instruments (a sensor, signal interfaces and a signal conditioner) that can measure temperature over a wide range (3K to 300K), relay low-level signals out 350 metres to the electronics with high accuracy, and operate in challenging radiation and power dissipation conditions. The second order comprised 277 cryogenic flowmeters that will be installed in the feeder coil termination boxes to measure the helium volumetric flow. In addition, 860 pressure measurement devices are required that will operate in normal (and not cryogenic) conditions.

Both components went through extensive design and qualification phases before series production could begin.

This past summer the full scope of the procurement¡ªmore than 3,000 devices¡ªwas successfully completed on time, and to cost, quality and performance specifications. After inspection at the neighbouring Magnet Infrastructure Facilities for ºÚÁÏÉçapp (MIFI, hosted by CEA Cadarache) this equipment will be shipped by the ºÚÁÏÉçapp to the Domestic Agencies procuring magnet structures, terminals and feeders.