Signal generator exciting an electromagnetic field for ion beam transport to the vacuum chamber of a mass spectrometer

A high-voltage high-frequency signal generator is described that excites an electric field for ion beam transport from an ion source to the vacuum chamber of a mass spectrometer. Excitation signals to the number of two are high-frequency sine-wave out-of-phase signals with the same amplitudes. The amplitude and phase of the signals vary from 20 to 100 V and from 10 kHz to 1 MHz, respectively. The generator also produces a controlled bias voltage in the interval 50–200 V. The frequency and amplitude of the signals, as well as the bias voltage, are computer-controlled via the USB interface.