JYFLTRAP: a Penning trap for precision mass spectroscopy and isobaric purification

Abstract

In this article a comprehensive description and performance of the double Penning trap setup JYFLTRAP will be detailed. The setup is designed for atomic mass measurements of both radioactive and stable ions and additionally serves as a very high resolution mass separator. The setup is coupled to the IGISOL facility at the accelerator laboratory of the University of Jyväskylä. The trap has been online since 2003 and it was shut down in summer 2010 for relocation to upgraded IGISOL facility. Numerous atomic mass and decay energy measurements have been performed using the time-of-flight ion-cyclotron resonance technique. Also the trap has been used in several decay spectroscopy experiments as a high-resolution mass filter.

Penning-trap-assisted study of excitations in Br88 populated in β decay of Se88Czerwiński1, Sieja2, Rza̧ca‐Urban3 et al. 2017Phys. Rev. CSelf Cite74102View full textAdd to dashboardCite

“…The fission fragments were first stopped in a helium gas cell, then extracted with the help of a sextupole ion guide (SPIG) [9] and accelerated to 30 keV. In the next step the radioactive beam was mass-separated with a 55 degree dipole magnet and sent to the radio-frequency coolerbuncher [10] from where ions were injected into the double Penning trap setup, JYFLTRAP [11]. Inside the JYFLTRAP system the isobaric beam was separated to the isotopic level using the buffer gas cooling technique [11,12].…”

“…In the next step the radioactive beam was mass-separated with a 55 degree dipole magnet and sent to the radio-frequency coolerbuncher [10] from where ions were injected into the double Penning trap setup, JYFLTRAP [11]. Inside the JYFLTRAP system the isobaric beam was separated to the isotopic level using the buffer gas cooling technique [11,12]. The isobaric scan of mass A = 88, measured with a microchannel plate (MCP) detector located after the Penning trap, is shown in Fig.…”

First isomeric yield ratio measurements by direct ion counting and implications for the angular momentum of the primary fission fragments

“…A dipole magnet (MRP ∼ 500) is used to separate the isobaric chain of interest based on the mass-tocharge ratio (m/q). The continuous mass-separated beam is directed to the linear quadrupole radio-frequency cooler and buncher (RFQ) [64,65], where the ions are cooled by collisions with buffer gas atoms and are subsequently released to the JYFLTRAP double Penning trap mass spectrometer [52] in short bunches of 10-to 15-μs duration. JYFLTRAP consists of two cylindrical Penning traps.…”

“…Details of the method can be found in Refs. [52,53,67]. After extraction, the ions are guided to the end of the beam line, where they are registered in a microchannel plate (MCP) detector.…”

“…At the IGISOL facility [51] at the University of Jyväskylä, coupled to the superior mass resolving power of the JYFLTRAP [52], metastable states separated by a few hundred keV from the ground state can be resolved by using just the first (purification trap) of the two traps and employing the sideband cooling technique [53]. Thus, a direct ion counting measurement of the relative intensities between the states can be accomplished, even for fission products with half-lives as short as half a second.…”