Abstract
The IGISOL-4 facility in the JYFL Accelerator Laboratory of the University of Jyvaskyla (JYFL-ACCLAB) produces low-energy radioactive ion beams, primarily for nuclear spectroscopy, utilizing an ion guide-based, ISOL-type mass separator. Recently, new ion manipulation techniques have been introduced at the IGISOL-4 including the application of the PI-ICR (Phase-Imaging Ion Cyclotron Resonance) technique at the JYFLTRAP Penning trap, as well as commissioning of a Multi-Reflection Time-Of-Flight (MR-TOF) separator/spectrometer. The successful operation of the MR-TOF also required significant improvement of the Radio-Frequency Quadrupole (RFQ) cooler and buncher device beam pulse time structure. In addition, laser ionization techniques have been developed for particular cases, for example, a hot cavity laser ion source for silver production. A new stable isotope ion source and a beam line has been introduced for tuning and calibration purposes. In addition to the installations at the IGISOL-4 facility, the extension of the vacuum-mode recoil separator MARA (Mass Analysing Recoil Apparatus), MARA-LEB (MARA Low Energy Branch) has been under development. MARA-LEB will utilize the gas-cell technique and laser ionization to convert MeV-scale radioactive beams to low-energy ones.
Highlights
The IGISOL-4 mass separator facility [1] in the JYFL Accelerator Laboratory of the University of Jyvaskyla (JYFL-ACCLAB) produces low-energy radioactive ion beams, primarily for nuclear spectroscopy, utilizing an ion guide-based, ISOL-type mass separator.The ion-guide technique is based on the survival of recoil ions in noble gas following a nuclear reaction in a thin target
Combined with charged particle-induced fission, IGISOL provides a wide selection of neutron-rich beams [2]
The stable isotope beams have in the past been produced by a glow discharge ion source placed in the IGISOL target chamber at the position of the on-line ion guide
Summary
The IGISOL-4 mass separator facility [1] in the JYFL Accelerator Laboratory of the University of Jyvaskyla (JYFL-ACCLAB) produces low-energy radioactive ion beams, primarily for nuclear spectroscopy, utilizing an ion guide-based, ISOL-type mass separator. For location of MR-TOF separator, see Fig. 3 are achieved with the radiofrequency quadrupole cooler and buncher, RFQ [10] It is a linear quadrupole ion trap, where the ions are cooled by allowing them to move in a low pressure helium gas. The second Penning trap, called the precision trap, is mostly used for atomic mass measurements and for advanced ion manipulation techniques such as the Ramsey cleaning technique [12] or the phase-dependent cleaning technique [13], offering a mass filtering with R > 106 utilising ion excitations in the precision trap Such resolution with the Ramsey method allowed for example physical separation of the low-lying 233 keV isomeric state and the ground state of 133mXe [14, 15]. MARA-LEB, the low-energy branch of MARA, will utilize the gas cell technique and laser ionization of the recoils stopped and neutralized in flowing noble gas, providing a means to convert MeV-scale radioactive beams to low-energy ones [17, 18]
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