This model demonstrates operation of a single quadrupole mass analyzer with a collisional cooling interface. The fringing fields are compensated by the Brubaker pre-filters.

Note, that all fields are presented by their axial distributions obtained from PAanalyser application. This decreases the size of PAs below 10 MB  keeping the accuracy of the fields very high. For example, 2D field in the middle section of the analytical quadrupole Q1 is accurate up to the electrode surface. This can be seen in the figure. Such accuracy, which is difficult to obtain by any other field presentation, is very important for accurate simulations of quadrupole mass filters.

The color gradient shows the pressure distribution within the device. The gas flow trough the cooling quadrupole is 200 m/s.

The analytical quadrupole Q1 has hyperbolic electrodes with the inscribed radius of 5 mm and the total length of 200 mm. The main driving RF frequency is 2 MHz.

Here, a powerful Scan2D tool is used to repeat simulations to define the transmission efficiency with different values of Q1_Offset and ST1_Offset voltages. Ions are detected in the BLOCK region and presented in the plot.

The analytical quadrupole is tuned to transmit 609 Da ions with the resolving power  of 1000.

In this simulation Scan1D tool is used. With this tool, simulations can be rerun with different ion masses or amplitudes of RF voltage within  predetermined ranges. This tool can be used to simulate a mass spectrum or to investigate the transmission.

In this Demo, the quadrupole filter Q1 is tuned to transmit 609 Da ions with the resolving power  of 1000,  V= 4398.0279 V (zero-to-peak), U= 737.6248 V. Based on the previous simulation, the following DC offset voltages are selected:

IQ0/Q0/IQ1/ST1/Q1/Exit = 10V/0V/-5V/-11V/-5V/-50V

In this simulation Scan1D tool is used. With this tool, simulations can be rerun with different ion masses or amplitudes of RF voltage within  predetermined ranges. This tool can be used to simulate a mass spectrum or to investigate the transmission.

In this Demo, the quadrupole filter Q1 is tuned to transmit 609 Da ions with the resolving power  of 1000,  V= 4398.0279 V (zero-to-peak), U= 737.6248 V. Based on the previous simulation, the following DC offset voltages are selected:

IQ0/Q0/IQ1/ST1/Q1/Exit = 10V/0V/-5V/-11V/-5V/-50V