Cryogenic Ltd and the National Physical Laboratory (NPL) have unveiled what they say is the world's most accurate instrument for comparative measurements of electric current.
The Cryogenic Current Comparator instrument can now be used by National Measurement Institutes (NMI) and laboratories around the world, providing a more accurate standard for current ratio, and ensuring current measurement is not a limiting factor in innovation.
We have delivered a vertically-aligned solenoid housed in a compact cryostat with a 58.5 mm diameter room-temperature bore offering unprecedented accessibility to the levitated sample. A single 1.5 W pulse-tube cold-head is used to cool the magnet system with remote-motor and linear-drive to Minimise vibrations.
Cryogenic Ltd has a new range of fast-sweeping cryogen-free superconducting magnets using high-performance Nb3Sn coils. These magnets provide an ideal platform for XMCD and other polarity switching applications. A continuous sweep rate of 100 sweeps/hour has been achieved between +/-7 Tesla. At +/-4T the same coil can be ramped continuously at full speed without pause giving up to 670 sweeps/hour.
Cryogenic Ltd has delivered an Ultra High Vacuum (UHV), nested split-pair, superconducting magnet system for use in XMCD measurements. The provides magnetic fields along the two orthogonal axes in the horizontal plane and provide a variable-temperature sample-space at the field centre between 1.5K and 400K. The magnet system is comprised of a 9 Tesla split-pair coil parallel to the beam and an orthogonal 4 Tesla split-pair magnet.
The high field low loss system which has been delivered to DESY (one of the world's leading accelerator centres) is made from pairs of nested winding sections, separated by a solid stainless steel former, machined to have wedges to give the optimum X-ray aperture. The field direction is vertical.
Since the design is stress limited and not critical current limited, the magnet is designed to operate at full field at 4.2K and does not require operating at 2.2K.