The Lake Shore EM4 and EM7 series electromagnets (EM) produce variable magnetic fields with a variety of air gap and pole cap configurations. The EM series are ideally suited for integration into customer designed magnetic test platforms for applications including magneto-optical studies, magnetic hysteresis studies, in-line annealing, Hall effect studies, susceptibility measurements, spin magnetic resonance demonstrations, and biological studies.

The HV series feature continuously adjustable poles, allowing rapid air gap changes to suit individual experiments, and threaded or bolt-on mounting that provides easy pole cap exchange. The EM series incorporate water-cooled coils and precision yokes made of magnetically soft, ultra-pure steel, assuring precise pole cap alignment as well as excellent field homogeneity and stability. The EM7 yoke is oriented at a 45° angle and the EM4 yoke at a 40° angle for optimum air gap accessibility. The EM4 series are also compact in size and have steel eyebolts, permitting convenient bench-top mounting to optical tables.

The EM series coupled with a Lake Shore magnet power supply (MPS) form a versatile laboratory electromagnet characterization system. This system, with true bipolar MPS power output, provides rapid uniform magnetic field ramping and field reversal to avoid discontinuities that occur during zero crossover when using unipolar power supplies.

Larger magnets are also available from Lake Shore.

• Typical field uniformity—EM4 magnets
• Typical field uniformity—EM7 magnets
• Electromagnet field plots
• Electromagnet schematics
• Support​ structures

Lake Shore offers NesLab® TF-series recirculating chillers in order to provide a complete laboratory solution. The NesLab chillers feature a CFC-free refrigeration system.

The refrigeration system uses a hermetically sealed compressor and hot gas bypass system of temperature control. This system eliminates on/off cycling and premature wear of the compressor. Strong pumps provide continuous flow even through cooling lines with small IDs.

The chillers we offer are rated at 65% duty cycle. This is appropriate for many common magnet testing applications such as hysteresis loops and other measurement applications where the operating cycle is spent at low to medium current, with only limited excursions to high fields. It may be appropriate to choose a larger chiller for higher duty cycle needs, when large magnetic fields must be maintained continuously. Please consult Lake Shore for an appropriate chiller for these applications.  

• Recirculating Chillers Technical Specifications