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Beam shaper for magnetic sector

Exhibit no. 358

Electrostatic lenses are often used to shape, guide and focus the ion beam in mass spectrometers. The lenses are referred to as "y" or "z" depending on the direction in which they affect the ion beam (horizontal or vertical direction).

The exhibit is the Z lens assembly from the double-focusing sector mass spectrometer ZAB-EQ manufactured by VG Analytical Ltd. in 1986. This aperture restricted the beam height. It was mounted on the entrance end of the flight tube positioned between the poles of the magnet. The assembly consists of seven pairs of plates; voltage was applied only to some of them while the others were grounded. The apertures in the Z plane of the earth and lens plates are 12 mm and 16 mm, respectively.

Wikipedia: Electrostatic lens

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