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MPINP:
Präzisionsexperimente - Abteilung Blaum
Abstract:
The PENTATRAP experiment located at the Max-Planck-Institut für Kernphysik in
Heidelberg deals with the high-precision mass ratio measurement of highly-charged, stable
and long-lived ions. For that purpose a setup with five separate Penning traps is used, which
allows simultaneous measurements in multiple traps. The Fourier-transform ion cyclotron
resonance method is used for the non-destructive determination of the axial frequency of
the trapped ions. This method uses the voltage drop over a parallel resonant circuit caused
by the image current induced in the trap electrodes. The design, the manufacturing and
the test of electronic circuits for the adjustment of the tank circuit’s quality factor was
carried out in the context of this bachelor thesis. Several concepts for the discrete and
continuous adjustment were created for that. For a realistic simulation of the conditions
inside the experiment, these concepts were tested at about 4 K inside a cold head. In the
course of those tests a concept with a field effect transistor as variable resistor appeared
most suitable, due to the continuous adjustability. Furthermore it showed that the losses in
the manufactured boards were strongly limiting the achievable quality factor. With suitable
modifications these losses were reduced.
