Measurement and simulation of the pressure ratio between the two traps of double Penning trap mass spectrometers

D. Neidherr, K. Blaum, M. Block, R. Ferrer, F. Herfurth, J. Ketelaer, S. Nagy, C. Weber

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

Penning traps are ideal tools to perform high-precision mass measurements. For this purpose the cyclotron frequency of the stored charged particles is measured. In case of on-line mass measurements of short-lived nuclides produced at radioactive beam facilities the ions get in general first prepared and cooled by buffer-gas collisions in a preparation trap to reduce their motional amplitudes and are then transported to a precision trap for the cyclotron frequency determination. In modern Penning trap mass spectrometers both traps are placed in the homogeneous region of one superconducting magnet to optimize the transport efficiency. Because the gas pressure inside the precision trap has to be very low in order to minimize the damping of the ion motion caused by collisions with rest gas molecules during the frequency determination, a pumping barrier is installed between both traps. To predict the pressure difference between the two traps in the region of molecular gas flow the motion of each particle can be simulated without consideration of the other particles. Thus, it is possible to calculate the transit probability through a tube of a given geometry. The results are compared with experimentally obtained pressure differences.

Original languageEnglish
Pages (from-to)4556-4559
Number of pages4
JournalNuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
Volume266
Issue number19-20
DOIs
Publication statusPublished - Oct 2008

Fingerprint

pressure ratio
Mass spectrometers
mass spectrometers
Cyclotrons
traps
Gases
simulation
Superconducting magnets
Ions
Charged particles
Isotopes
Flow of gases
cyclotron frequency
Damping
Molecules
Geometry
ion motion
collisions
superconducting magnets
molecular gases

Keywords

  • Mass spectrometry
  • Penning traps
  • Pressure ratio

ASJC Scopus subject areas

  • Instrumentation
  • Nuclear and High Energy Physics

Cite this

Measurement and simulation of the pressure ratio between the two traps of double Penning trap mass spectrometers. / Neidherr, D.; Blaum, K.; Block, M.; Ferrer, R.; Herfurth, F.; Ketelaer, J.; Nagy, S.; Weber, C.

In: Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms, Vol. 266, No. 19-20, 10.2008, p. 4556-4559.

Research output: Contribution to journalArticle

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