Speaker
Mr
Robert Wolf
(Ernst-Moritz-Arndt University Greifswald, Germany)
Description
The Penning-trap mass spectrometer ISOLTRAP performs precision mass measurements at the isotope separator ISOLDE/CERN with a relative mass uncertainty routinely reaching δm/m≈1x10-8 [1]. The time-of-flight ion-cyclotron-resonance (ToF-ICR) detection technique is employed to determine the frequency of ions stored in a Penning trap, from which their mass can be extracted [2]. Nuclides with half-lives below 100ms and production yields of less than 1000 ions per second have been investigated. Masses of light systems - such as 17Ne - up to heavy ones - such as 229Rn, give insight into numerous physics topics.
As other setups are now also experiencing, ISOLTRAP is reaching a limitation with respect to the ion beam which is delivered from the on-line facility producing the short-lived nuclides of interest. In particular, due to space-charge effects only limited amounts of unwanted isobaric components can be handled by Penning traps . Thus, an isobar separator based on multi-reflection time-of-flight mass spectrometry (MR-ToF MS) has been implemented to support the isobaric contamination removal. The MR-ToF MS system consists of two ion optical mirrors between which ions are oscillating and are separated according to their different mass-over-charge ratios m/q [3]. First tests resulted in a mass resolving power of up to m/∆m ≈ 10^5. The separation was demonstrated offline for the isobaric ions CO+ and N2+ and online for example at m/q=163. In combination with a Bradbury-Nielsen beamgate [4,5], a selection of the separated species can be achieved. The technical setup and recent results are presented.
[1] M. Mukherjee et al., Eur. Phys. J. A 35, 1 (2008)
[2] M. König et al., Int. J. Mass Spectrom. Ion. Process. 142, 95-116 (1995)
[3] W. R. Plass et al., Eur. Phys. J. Special Topics 150, 367 (2007)
[4] N. E. Bradbury, R. A. Nielsen, Phys. Rev. 49, 388 (1936)
[5] W. R. Plass et al., Nucl. Instrum. Methods B 266, 4560 (2008)
Author
Mr
Robert Wolf
(Ernst-Moritz-Arndt University Greifswald, Germany)
Co-authors
Dr
Alexander Herlert
(CERN)
Ms
Christine Böhm
(Max Planck Institute for Nuclear Physics, Heidelberg, Germany)
Mr
Christopher Borgmann
(Max Planck Institute for Nuclear Physics, Heidelberg, Germany)
Dr
Dave Lunney
(CSNCM-IN2P3-CNRS, France)
Dr
Dennis NEIDHERR
(GSI Helmholtz Centre for Heavy Ion Research, Germany)
Dr
Dietrich Beck
(GSI Helmholtz Centre for Heavy Ion Research, Germany)
Dr
Frank Herfurth
(GSI Helmholtz Centre for Heavy Ion Research, Germany)
Dr
Georges Audi
(CSNCM-IN2P3-CNRS, France)
Ms
Juliane STANJA
(TU Dresden, Germany)
Prof.
Kai Zuber
(TU Dresden, Germany)
Prof.
Klaus Blaum
(Max Planck Institute for Nuclear Physics, Heidelberg, Germany)
Prof.
Lutz SCHWEIKHARD
(Ernst-Moritz-Arndt University Greifswald, Germany)
Dr
Magdalena Kowalska
(CERN)
Mr
Marco ROSENBUSCH
(Ernst-Moritz-Arndt University Greifswald, Germany)
Dr
Martin Breitenfeldt
(KU Leuven, Belgium)
Mr
Meng Wang
(CSNCM-IN2P3-CNRS, France)
Dr
R. Burcu CAKIRLI
(Max Planck Institute for Nuclear Physics, Heidelberg, Germany)
Ms
Sarah Naimi
(CSNCM-IN2P3-CNRS, France)
Dr
Sebastian George
(NSCL Michigan State University, USA)
Dr
Sergey ELISEEV
(Max Planck Institute for Nuclear Physics, Heidelberg, Germany)
Dr
Stefan Schwarz
(NSCL Michigan State University, USA)
Dr
Susanne Kreim
(Max Planck Institute for Nuclear Physics, Heidelberg, Germany)
