Frankfurt 2014 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 58: Instrumentierung
HK 58.2: Talk
Friday, March 21, 2014, 11:15–11:30, HZ 10
A radiofrequency quadrupole cooler and buncher for the TRIGA-SPEC experiment — •Thomas Beyer for the TRIGA-SPEC collaboration — Max-Planck-Institut für Kernphysik, Heidelberg
The mass spectrometer TRIGA-TRAP and the laser spectroscopy setup TRIGA-LASER, forming the TRIGA-SPEC experiment, are installed at the research reactor TRIGA Mainz in order to perform high-precision measurements of ground state properties of short-lived neutron-rich radionuclides. Such measurements allow testing the predictive power of nuclear mass models and support astrophysical nucleosynthesis calculations. The extraction and preparation of these nuclides for both experimental branches is achieved by using an aerosol-based gas-jet system to transport them from an actinide target located inside the reactor to an external surface ionization ion source. The ion source is followed by a mass separator and a linear Paul trap, which was the cooler for emittance elimination COLETTE at MISTRAL/ISOLDE. It has been installed in Mainz and the capability of accumulating and bunching ion beams has been implemented to provide low-emittance ion pulses of 250 ns width containing up to 106 ions. A brief description of the upgraded linear Paul trap as well as its performance in bunching stable ions is presented.