The FRS Ion Catcher – A facility for high-precision experiments with stopped projectile and fission fragments

Plaß, W. R.; Dickel, T.; Purushothaman, S.; Dendooven, P.; Geißel, H.; Ebert, Jens; Haettner, E.; Jesch, C.; Ranjan, M.; Reiter, M. P.; Weick, H.; Amjad, F.; Ayet, S.; Diwisch, M.; Estradé, A.; Farinon, F.; Greiner, Florian; Kalantar‐Nayestanaki, N.; Knoebel, R.; Kurcewicz, J.; Lang, Johannes; Moore, I. D.; Mukha, I.; Nociforo, C.; Petrick, Martin; Pfuetzner, M.; Piétri, S.; Procházka, A.; Rink, Ann-Kathrin; Rinta‐Antila, S.; Schaefer, D. L.; Scheidenberger, C.; Takechi, M.; Tanaka, Y. K.; Winfield, J. S.; Yavor, M.I.

doi:10.1016/j.nimb.2013.07.063

Cited by 116 publications

(51 citation statements)

References 19 publications

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“…The exotic nuclides produced and separated in flight at relativistic energies are slowed down with a mono-energetic degrader system, implanted in the cryogenic stopping cell (CSC) and afterwards, extracted within ~ 20 ms, analyzed and cooled with a gas-filled RFQ and finally injected into the MR-TOF-MS [39], see section above. In an MR-TOF-MS the exotic nuclides are analyzed in flight time coordinate according to their m/q ratio.…”

Section: The Mr-tof-msmentioning

confidence: 99%

The Challenge of High-Resolution Spectrometer Experiments with Exotic Nuclei

et al. 2015

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Exotic atomic nuclei are short-lived species and are characterized by extreme proton-to-neutron ratios. These nuclei are created in stellar reactions and are keys to understand the abundance of the elements in the universe [1]. Exotic nuclei have quite different properties compared to the well-known species close to the valley of beta stability. This observation makes them essential for the basic understanding of nuclear matter. Nowadays, these rare isotopes can also be produced with modern powerful accelerator facilities at several laboratories worldwide [2] which solve the problems of the inherent small production cross section sections via high primary beam intensities and high energies [3,4]. However, the successful production of exotic nuclei is only the first necessary step, the separation from the primary beam and from the abundant contaminants and the measurements of their properties are of equal importance [5]. Spectrometer BasicsHigh resolution experiments with energetic heavy ions can in principle be performed in-flight with lateral-dispersive and longitudinal-dispersive electromagnetic spectrometers. Lateral-dispersive systems analyze with magnetic and electric dipole fields and apply multipole fields for focusing and correction of image aberrations [6,7]. A typical lateral-dispersive spectrometer stage, such as it is used in many accelerator based heavy ion laboratories, is shown schematically in Figure 1. A lens system is used at the entrance of a dipole magnet and a second one is placed behind to determine the focal plane conditions. The physical quantity of interest is the momentum resolving power which is mainly determined by the entrance emittance of the ion beam to be analyzed and the illuminated area in the dispersive plane of the dipole magnet. Electric fields can also be applied at low energies (at and below the Coulomb barrier) instead of magnets, but the same statements on the resolving power hold in this case as well. In longitudinal dispersive devices such as ion storage rings [8] and multiplereflection time-of-flight mass spectrometers (MR-TOF-MS) [9,10] the challenge is to achieve isochronous conditions with negligible aberrations of the higher-order optics. In general, one can achieve a higher resolving power with the longitudinal-dispersive, multi-path devices compared to the lateraldispersive spectrometers. The latter spectrometers may be applied as in-flight separators for nuclear reaction products and usually consist of a combination of several dispersive stages. The advantage of these spectrometers is the superior spatial isotopic separation of rare isotopes from the intense primary beam and the abundant contaminants. Space-charge problems are of minor importance for such lateral-dispersive spectrometers. They can have an overall maximum momentum resolving power (p/p) of several 10 4 [11,12], whereas storage rings and MR-TOF-MS systems can achieve more than 50 times higher resolving powers. In lateral spectrometers, the spatial deflections and resolving power are measured by po...

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Section: The Mr-tof-msmentioning

confidence: 99%

The Challenge of High-Resolution Spectrometer Experiments with Exotic Nuclei

et al. 2015

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“…Offline experiments have been performed at Oak Ridge [22] and spectra of short-lived nuclides (with already known mass values) were taken at RIKEN [13] and at GSI [14]. Beyond these…”

Section: Mr-tof Studies At Isoltrapmentioning

confidence: 99%

“…In order to speed up and to enhance the purification, isobaric mass separation by use of a multi-reflection time-of-flight (MR-ToF) mass analyzer [10] has recently been added to the experimental event sequence [11]. In addition, this device can be used as a mass spectrometer of its own [12][13][14]. It allows precision measurements as well as ion-intensity monitoring at high, i.e.…”

Section: Introductionmentioning

confidence: 99%

Isobar separation and precision mass spectrometry of short-lived nuclides with a multi- reflection time-of-flight analyzer

Schweikhard

2014

Proceedings of 10th Latin American Symposium on Nuclear Physics and Applications — PoS(X LASNPA)

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Multi-Reflection Time-of-Flight Mass Spectrometry (MR-ToF MS) is a technique that hasrecently been introduced to nuclear physics research. The method is reviewed and several examples from ISOLTRAP at ISOLDE/CERN are given that illustrate its power and usefulness. Initially built for fast separation of the ions of interest from abundant contaminations in order to allow precision mass spectrometry, which was demonstrated in the case of 82 Zn, ISOLTRAP's multi-reflection time-of-flight mass spectrometer also succeeded in measuring the previously unknown mass values of 53 Ca and 54 Ca. In addition, proof-of-principle experiments have been performed which demonstrate further applications where fast and high-resolution separation of ions of interest from mixtures with high abundances of contamination species is required. Furthermore, in an off-line setup MR-ToF MS is explored with respect to space-charge effects in order to find the limits of the ion abundances that can be handled. The phenomena observed include peak coalescence in the time-of-flight spectra and different distributions of the kinetic energies of the stored ion species.

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“…The goal is to stop effectively the isotopically separated exotic nuclei in the He gas volume. In the first experiments with the CSC [20] with uranium projectile fragments produced at 1000 A·MeV, the stopping efficiency after range-bunching with a monoenergetic degrader system placed at the central focal plane of the FRS was about 25 %. This experimental result is deduced from range measurements of 223 Th fragments.…”

Section: -P4mentioning

confidence: 99%

“…In this spirit, as mentioned above, we have tested the combination of the cryogenic gasstopping cell and multiple-reflection time-of-flight mass spectrometer [20].…”

Section: Inpc 2013mentioning

confidence: 99%

Recent Precision Experiments with Exotic Nuclei Produced with Uranium Projectiles and Experimental Prospects at Fair

Geißel

Chen

Dickel

et al. 2014

EPJ Web of Conferences

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Abstract.Precision experiments with relativistic fragments separated in-flight require special experimental methods to overcome the inherent large emittance from the creation in nuclear reactions and atomic interactions in matter. At GSI relativistic exotic nuclei have been produced via uranium projectile fragmentation and fission and investigated with the inflight separator FRS directly, or in combination with either the storage-cooler ring ESR or the FRS Ion Catcher. 1000 A·MeV 238 U ions were used to create 60 new neutron-rich isotopes separated and identified with the FRS to measure their production cross sections. In another experimental campaign the fragments were separated in flight and injected into the storage-cooler ring ESR for accurate mass and lifetime measurements. In these experiments we have obtained accurate new mass values analyzed via a novel method which has reduced the systematic errors for both Schottky Mass Spectrometry (SMS) and for Isochronous Mass Spectrometry (IMS). Pioneering experiments have been carried out with the FRS Ion Catcher consisting of three experimental components, the dispersive magnetic system of the FRS with a monoenergetic and a homogeneous degrader, a cryogenic stopping cell filled with pure helium and a multiple-reflection time-of flight mass separator. The FRS Ion Catcher enables high precision spectroscopy experiments with eV to keV exotic nuclides. Results from these different FRS experiments are presented in this overview together with prospects for the next-generation facility Super-FRS. The novel features of the Super-FRS compared with the present FRS will be discussed in addition.

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The FRS Ion Catcher – A facility for high-precision experiments with stopped projectile and fission fragments

Cited by 116 publications

References 19 publications

The Challenge of High-Resolution Spectrometer Experiments with Exotic Nuclei

The Challenge of High-Resolution Spectrometer Experiments with Exotic Nuclei

Isobar separation and precision mass spectrometry of short-lived nuclides with a multi- reflection time-of-flight analyzer

Recent Precision Experiments with Exotic Nuclei Produced with Uranium Projectiles and Experimental Prospects at Fair

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