The Penning trap mass spectrometer
Fig. 1 shows the TRIGA-Trap mass spectrometer. After ionization of the nuclides of interest in the high-temperature surface ion source, mass separation in the dipole magnet as well as cooling and accumulation in the RFQ-buncher and deceleration in a pulsed drift tube, the ions are first stored in a cylindrical Penning trap for mass selective helium buffer-gas cooling in order to reduce the amplitudes of motions and for beam purification. Then the ions of interest are transferred to a high-precision Penning trap to perform the mass measurement based on the cyclotron frequency determination of the ion with charge-to-mass ratio q/m stored in the B = 7 T strong magnetic field .
The DLD40 MCP detector enables the application of the phase-imaging ion cyclotron resonance technique.
For the FT-ICR method an SL-quartz crystal can be connected in parallel between the trap electrodes and the electronic amplifier to improve the sensitivity of the measurement of ν+ and its frequency modulation .
The complete system is controlled by the LabView based CS , maintained by GSI Darmstadt and the CS Developer team. Many other Penning trap facilities also use that system and share the knowledge.
|||K. Blaum, Phys. Rep. 425, 1-78 (2006)|
|||S. Lohse et al., Rev. Sci. Instrum. 91, 093202 (2020)|