A1 Journal article (refereed)
Increasing the rate capability for the cryogenic stopping cell of the FRS Ion Catcher (2024)

Zhao, J.W., Amanbayev, D., Dickel, T., Miskun, I., Plaß, W.R., Tortorelli, N., Ayet San Andrés, S., Beck, S., Bergmann, J., Brencic, Z., Constantin, P., Geissel, H., Greiner, F., Gröf, L., Hornung, C., Kuzminchuk, N., Kripkó-Koncz, G., Mardor, I., Pohjalainen, I., . . . Yu, J. (2024). Increasing the rate capability for the cryogenic stopping cell of the FRS Ion Catcher. Nuclear Instruments and Methods in Physics Research. Section B : Beam Interactions with Materials and Atoms, 547, Article 165175. https://doi.org/10.1016/j.nimb.2023.165175

JYU authors or editors

Publication details

All authors or editors: Zhao, J.W.; Amanbayev, D.; Dickel, T.; Miskun, I.; Plaß, W.R.; Tortorelli, N.; Ayet San Andrés, S.; Beck, S.; Bergmann, J.; Brencic, Z.; et al.

Journal or series: Nuclear Instruments and Methods in Physics Research. Section B : Beam Interactions with Materials and Atoms

ISSN: 0168-583X

eISSN: 1872-9584

Publication year: 2024

Publication date: 01/12/2023

Volume: 547

Article number: 165175

Publisher: Elsevier

Publication country: Netherlands

Publication language: English

DOI: https://doi.org/10.1016/j.nimb.2023.165175

Publication open access: Not open

Publication channel open access: 

Web address of parallel published publication (pre-print): https://arxiv.org/abs/2308.02224

Abstract

At the FRS Ion Catcher (FRS-IC), projectile and fission fragments are produced at relativistic energies, separated in-flight, energy-bunched, slowed down, and thermalized in the ultra-pure helium gas-filled cryogenic stopping cell (CSC). Thermalized nuclei are extracted from the CSC using a combination of DC and RF electric fields and gas flow. This CSC also serves as the prototype for the CSC of the Super-FRS, where exotic nuclei will be produced at unprecedented rates making it possible to go towards the extremes of the nuclear chart. Therefore, it is essential to efficiently extract thermalized exotic nuclei from the CSC under high beam rate conditions, in order to use the rare exotic nuclei, which come as cocktail beams. The dependence of the extraction efficiency on the intensity of the impinging beam into the CSC was studied with a primary beam of 238U and its fragments. Tests were done with two different versions of the DC electrode structure inside the cryogenic chamber, the standard 1 m long and a short 0.5 m long DC electrode systems. In contrast to the rate capability of 104 ions/s with the long DC electrode system, results show no extraction efficiency loss up to the rate of 2 × 105 ions/s with the new short DC electrode. This order of magnitude increase of the rate capability paves the way for new experiments at the FRS-IC, including studies of exotic nuclei with in-cell multi-nucleon transfer reactions. The results further validate the design concept of the CSC of the Super-FRS, which was developed to effectively manage beams of even higher intensities.

Keywords: nuclear physics; research equipment

Contributing organizations

Ministry reporting: Yes

VIRTA submission year: 2024

Preliminary JUFO rating: 2