go back to the previous website of
Poznan Radiocarbon Laboratory

AMS Machine – Drift Tube

After passing analysing magnet, carbon ions of different mass move along different trajectories. In the drift tube, 13C+ and 12C+ ions are collected and their electric currents are measured. The 14C+ ions freely pass into electrostatic analyser.

AMS Machine - Drift Tube
Drift tube with Faraday cups for measurements of 12C and 13C currents

At the trajectories of 12C+ and 13C+ ions, Faraday cups are placed, whch collect and measure electric charge brought by the ions. As the beams project in short pulses (see “beam sequencer “), electric current for each pulse is determined separately. Typical currents in the pulses are 30 microamps and 300 nanoamps for 12C and 13C, respectively.

AMS Machine - Drift Tube

Hover to see animation

Other pages on the AMS spectrometer:
General | Ion source | Injection magnet | Accelerator | Analysing magnet | Drift tube | Electrostatic analyser | 14C detector