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TRIGA-TRAP

 

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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 [1].

Sketch of the TRIGA-Trap setup.
Fig. 1: Sketch of the TRIGA-Trap setup. The ions from the on-line ion source enter from the left. The superconducting magnet houses both Penning traps. On the right end of the setup, the 4-K cryostat for the FT-ICR detection electronics as well as a DLD40 MCP detector for the TOF-ICR and PI-ICR methods are mounted.
View on the TRIGA-TRAP experiment
Fig. 2: View on the TRIGA-TRAP experiment with the superconducting magnet for the two Penning traps in the center. The detectors for TOF-ICR and FT-ICR are mounted in the vacuum chambers on the left.

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The high–precision 5-pole cylindrical Penning trap of TRIGA-Trap machined at MPIK
Fig. 3: The high–precision 5-pole cylindrical Penning trap of TRIGA-Trap machined at MPIK, r=12mm. The theoretical TR=0.88103, the experimental TR=0.87325.

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 [2].

The complete system is controlled by the LabView based CS external Link, maintained by GSI Darmstadt and the CS Developer team. Many other Penning trap facilities also use that system and share the knowledge.

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References

[1]   K. Blaum, Phys. Rep. 425, 1-78 (2006) externer Link
[2]   S. Lohse et al., Rev. Sci. Instrum. 91, 093202 (2020) externer Link