Exposition

RADIO FREQUENCY COIL

Exhibit no. 648

The RF coil is a part of the electronics used to generate radiofrequency for multipole ion guides or ion traps. The typical RF system uses a low power oscillator, boosted by several amplifier stages. 

The oscillator is an LC-resonant circuit consisting of a coil (inductor) and a capacitor. The coils are constructed of a relatively large diameter copper wire (1-2 mm), wound on plastic coil forms, with coil diameters of several centimeters. The coil support prevents changing of the coil shape with temperature and thus prevents the frequency change.

This exhibit comes from an ion trap mass spectrometer with internal ionization Saturn 2000R (Varian, Inc.), which was manufactured in 2000. It served as a part of the RF generator assembly consisting of an RF generator circuit board, an RF detector circuit board, and the RF coil. The RF coil and the RF detector circuit board were located in a shielded aluminum housing beneath the vacuum manifold, which enclosed the ion trap.

Wikipedia: LC circuit
Wikipedia: Radio frequency

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