Del Mar Photonics
A linear radiofrequency quadrupole ion trap for the cooling and bunching of radioactive ion beams (pdf)
A linear radiofrequency quadrupole ion guide and beam buncher has been
at the ISOLTRAP mass spectrometry experiment at the ISOLDE facility at CERN.
The apparatus is being used as a beam cooling, accumulation, and bunching system. It operates with a buffer gas that cools the injected ions and converts the quasicontinuous 60-keV beam from the ISOLDE facility to 2.5-keV beam pulses with improved normalized transverse emittance. Recent measurements suggest a capture efficiency of the ion guide of up to 40 % and a cooling and bunching efficiency of at least 12 % which is expected to still be increased. The improved ISOLTRAP setup
has so far been used very successfully in three on-line experiments.
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