Velocity Selectors Velocity Selectors
The NEC E x B
velocity selectors provide mass and charge state separation
of ion beams. Charged particles passing through orthogonal electric (E)
and magnetic (B) fields are deflected unless their velocity equals E/B.
Several models are available. All models use permanent magnets to feature "one knob" control of E/B settings and to minimize power requirements. A 0-10 V input signal controls a pair of power supplies for providing the positive and negative voltages to the electric field plates. The following table provides data for our standard models. NEC can also provide customers with custom solutions, such as different aperture sizes, for their applications.
| Velocity Selector Models | ||||
|---|---|---|---|---|
| VS5-502 | VS5-504 | VS5-506 | VS5-508 | |
| Electric Field Plates (L x W x Gap) | 3 x 7/8 x 5/8 (in.) 7.6 x 2.2 x 1.6 (cm) | 6 x 7/8 x 5/8 (in.) 15.2 x 2.2 x 1.6 (cm) | 4-7/16 x 1 x 5/8 (in.) 11.3 x 2.5 x 1.6 (cm) | 2 x 7/8 x 5/8 (in.) 5.1 cm x 2.2 x 1.6 (cm) |
| Plate Power Supplies (one pos., one neg.) | 0 to 2.5 kV 1 mA | 0 to 2.5 kV 1 mA | 0 to 10 kV 7.5 mA | 0 to 2.5 kV 1 mA |
| Magnet Poles (L x W x Gap) | 2.9 x 1.9 x 1.23 (in.) 7.4 x 4.8 x 3.1 (cm) | 6 x 1.9 x 1.23 (in.) 15.2 x 4.8 x 3.1 (cm) | 4.2 x 2.1 x 1.5 (in.) 10.7 x 5.3 x 3.8 (cm) | 2 x 2.1 x 1.25 (in.) 5.1 x 5.3 x 3.2 (cm) |
| Magnet Type Max Field (on axis) | Ceramic 1200 Gauss | Ceramic 1500 Gauss | Samarium Cobalt 2300 Gauss | Samarium Cobalt 3300 Gauss |
| Entrance Aperture Exit Aperture | 3/8 in. (0.95 cm) 3/64 in. (0.12 cm) | 3/8 in. (0.95 cm) 3/64 in. (0.12 cm) | 9/16 in. (1.4 cm) 3/8 in. (0.95 cm) | 5/8 in. (1.6 cm) 3/8 in. (0.95 cm) |
| Mass Resolution | Depends on ion beam/species and aperture sizes. | |||
For orders, inquiries, comments and more information about our products, please contact our sales department at nec@pelletron.com
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