Magnetics Business & Technology - Summer 2013 - (Page 12)

MAGNETS • MATERIALS • MEASUREMENT Bruker Introduces Actively Refrigerated Ascend Aeon Magnet Product Line Bruker has introduced the Ascend Aeon 600 and 700 superconducting, nitrogen-free magnet systems, which feature fully integrated Helium reliquefaction. The unique Aeon technology enables long-term operation without the need for user maintenance and without compromising Bruker’s NMR performance. By obviating the need for liquid helium and nitrogen refills, the Ascend Aeon 600 and 700 MHz magnets deliver user convenience and independence from cryogen supplies. Optional Ascend Aeon magnets require a higher initial capital investment than standard 600 and 700 MHz Ascend low-loss magnets, which require periodic refills of liquid Nitrogen and liquid Helium, and which will continue to be offered as Bruker’s standard NMR magnets. In addition, Bruker now also offers actively refrigerated Ascend Aeon 400 and 500 magnets, which are nitrogen-free, have low liquid Helium evaporation rates and require liquid Helium refills only every 18 months. These Ascend Aeon 400 and 500 magnets represent a convenient surcharge option for routine 400 and 500 MHz NMR customers, and also provide high quality NMR results. In recent years, Bruker has already successfully installed close to 20 such Ascend Aeon 400 and 500 magnets in customer laboratories around the world, with excellent results and field reliability. With scheduled refrigeration maintenance service from Bruker, all Ascend Aeon magnet systems can be operated by customers in a care-free manner for years. Hundreds of preclinical MRI customers worldwide have been enjoying this level of convenience since the introduction of Bruker’s actively refrigerated MRI magnets more than a decade ago. The Ascend Aeon 600 and 700 MHz magnets are straightforward to install and are equipped with an integrated monitoring unit and sound insulation, providing safe, user-friendly and quiet operation. By maintaining the reserve liquid helium reservoir in the Aeon design, which is filled once upon initial installation, the long-term Ascend Aeon magnet stability is maintained, even in the event of potential power outages lasting several days and even up to a week. “With the new Ascend Aeon we have been able to focus on the science and not the magnet technology. Its convenience makes our daily tasks easier,” said Dr. Sarah Kliegman at the ETH Institute for Biogeochemistry and Pollutant Dynamics (IBP) in Zürich, Switzerland, where an Ascend Aeon 400 magnet has been installed and running already for well over one year. 12 Magnetics Business & Technology • Summer 2013 Dr. Werner Maas, president of Bruker BioSpin, said, “While already available in hundreds of our preclinical MRI magnets for years, the extreme demands for stability and spectral purity of high-resolution NMR had until recently prevented us from introducing this active refrigeration convenience for NMR magnets. Thanks to several proprietary technological breakthroughs and further magnet and refrigeration systems integration optimization over several years, our magnet engineers have now made the ‘care-free’ Ascend Aeon option available also to our high-resolution NMR customers.” Linear Actuator with Moving Magnet Provides Improved Heat Dissipation BEI Kimco Magnetics’ new Moving Magnet Voice Coil Actuator series has improved heat dissipation by virtue of its stationary coil design. By allowing the magnet to move and keeping the coil fixed, the heat generated by the coil assembly can be more readily managed. “Unlike standard voice coil actuators where the magnet assembly is intended to remain fixed while the coil assembly moves, BEI Kimco’s Moving Magnet Voice Coil Actuators are designed to use a stationary coil,” said Jim McNamara, senior applications engineer. When compared to conventional moving coil designs, a fixed coil assembly is more easily integrated with an appropriate heat sink, providing higher continuous duty performance. This is especially important for demanding applications where heat management is of particular concern. Thanks to Kimco’s expertise in design of magnetic field circuits this actuator uses magnetic fields very efficiently. And with Kimco’s engineering expertise, it can be customized to meet specific requirements. In addition, having a stationary coil allows for a simpler design of the electrical connections. Typical applications include remotely controlled circuit breakers, medical hand tools and other delicate instrumentation. Programmable Hall Switch Extends Flexibility of Detection Circuit Designs Diodes, Inc. has introduced a programmable omnipolar Hall effect switch enabling designers to use the same contactless detection circuit in multiple applications or with different field strengths. The miniature and micropower AH1898 is suitable for numerous portable consumer applications including cell phones, tablets and cameras as well as a variety of domestic, office and industrial equipment. Able to detect both north and south magnetic fields, the AH1898 features a band-select pin, which allows device sensitivity to be changed to one of two predefined magnetic sensitivity ranges. In addition, it can also be used change the band on the fly, using an external logic source or microcontroller. The high sensitivity of

Table of Contents for the Digital Edition of Magnetics Business & Technology - Summer 2013

Magnetics Business & Technology - Summer 2013
Editor's Choice
Designing Current Transformers with Simulation
Magnets • Materials • Measurement
Application • Component Developments
Research & Development
New Linear Motor Designs Improve Speed and Positioning
Industry News
Marketplace/Advertising Index
Spontaneous Thoughts: Back to Normal

Magnetics Business & Technology - Summer 2013