Small and light weight at 32kg Peak continuous fields up to 3.7 T for 5mm pole face diameter at 2mm gap Any mounting orientation Fast cycle times
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1 OVERVIEW The 3480 dipole electromagnet is a light weight versatile system that can provide fields approaching 4 Tesla. At 32 kg this magnet can easily be moved between applications and can be operated in any orientation. The system is intended to be compatible with systems that already utilize GMW s 3470 electromagnet. The 3480 is shipped with a standard set of poles that optimize maximum field but several pole options are available. GMW can also design custom poles that achieve a specific performance. Poles are interchangeable and are available with an axial access bore. FEATURES Small and light weight at 32kg Peak continuous fields up to 3.7 T for 5mm pole face diameter at 2mm gap Any mounting orientation Fast cycle times APPLICATIONS EPR FMR MOKE 955 Industrial Road San Carlos, CA USA Tel +1 (650) Fax +1 (650) sales@gmw.com 1
2 MODEL 3480 GENERAL SPECIFICATIONS Dimensions Weight (excluding hoses and water) Standard Pole Face Diameter 285mm W x 197mm D x 213mm H (11.22 inch w x 7.76 inch D x 8.39 inch H) 32 kg (70 pounds) 16.00mm (0.63 inch) Coils (series connected) Resistance (20 C) Max. Resistance (65 C) Max. continuous current 35 A Peak Current (sinusoid) 50 A Peak Current (triangle wave) 60 A Max. continuous Power 2.0 kw Max Instantaneous Power 8.0 kw Inductance 180 mh Water Cooling (supply psi) 2 Litre/min Anticipated max. sinusoidal frequency (1T) 10 Hz Over Temperature Interlock 65 C 955 Industrial Road San Carlos, CA USA Tel +1 (650) Fax +1 (650) sales@gmw.com 2
3 Figure 1: Comparison of performance of different pole pairs. The data reflects performance at 35A with coils at maximum spacing. 955 Industrial Road San Carlos, CA USA Tel +1 (650) Fax +1 (650)
4 955 Industrial Road San Carlos, CA USA Tel +1 (650) Fax +1 (650)
5 955 Industrial Road San Carlos, CA USA Tel +1 (650) Fax +1 (650)
6 955 Industrial Road San Carlos, CA USA Tel +1 (650) Fax +1 (650)
7 955 Industrial Road San Carlos, CA USA Tel +1 (650) Fax +1 (650)
8 Figure 2: Current versus voltage curve for all windings connected in series. The departure from linearity is due to coil heating. 955 Industrial Road San Carlos, CA USA Tel +1 (650) Fax +1 (650)
9 Figure 3: Peak achievable field against available power for standard pole (16mm pole face diameter) at 10mm pole gap and minimum coil spacing. This plot assists the selection of power source for desired performance. 955 Industrial Road San Carlos, CA USA Tel +1 (650) Fax +1 (650)
10 955 Industrial Road San Carlos, CA USA Tel +1 (650) Fax +1 (650)
11 Application Note: Ferromagnetic Resonance A custom pole is designed to create peak field across a 2mm pole gap for the purposes of FMR analyses. A comparison with the standard 16mm pole is shown below. Figure 4: Field versus pole gap for two pole options. Excitation is 35A. For any pole gap an optimised pole is available, on request, which will provide best performance for any specific pole gap. 955 Industrial Road San Carlos, CA USA Tel +1 (650) Fax +1 (650) sales@gmw.com 11
12 Field Uniformity in the Median Plane Figure 5: Field profile in the median plane for the 5mm pole face diameter pole. Excitation current is 35A and coils are at minimum spacing. The field uniformity is better than ±0.5% over Ø3mm. Peak continuous field 3.71 Tesla Peak pulsed field 3.85 Tesla Field uniformity <±0.5% over Ø3mm Higher uniformity field available on request. 955 Industrial Road San Carlos, CA USA Tel +1 (650) Fax +1 (650)
13 Figure 6: Performance of optimised pole for 2mm pole gap. Continuous operation is possible up to 35A with a triangle waveform possible up to 60A peak. 955 Industrial Road San Carlos, CA USA Tel +1 (650) Fax +1 (650) sales@gmw.com 13
14 Application Note: EPR Spectroscopy GMW offers poles optimised for EPR applications. Two examples are shown below for pole face spacing of 14mm. Each pole give good uniformity across the excitation range for frequencies up to 40GHz but each is optimised to give excellent field uniformity at either K- band or the Q-band. Similar custom poles are available on request for any frequency in the 0-40GHz frequency band. Waveband L S C X P K Q U V [mm] f [GHz] B [T] Industrial Road San Carlos, CA USA Tel +1 (650) Fax +1 (650) sales@gmw.com 14
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