Exposition

LC RESONANT CIRCUIT

Exhibit no. 587

The RF system 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 a 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.

Pictured is an LC resonant circuit with RF coil and variable air capacitor from INCOS 50 (Finnigan MAT). The INCOS 50 was an El/CI quadrupole mass spectrometer released around 1986. The samples were introduced by a GC operated with capillary, wide-bore or packed columns, or using desorption or other probes.

Wikipedia: LC circuit
Wikipedia: Radio frequency

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