Design of the Advanced Rare Isotope Separator ARIS at FRIB

Hausmann, M.; Aaron, Adam; Amthor, A. M.; Avilov, M.; Bandura, L.; Bennett, R.; Bollen, G.; Borden, T.; Burgess, T.; Chouhan, S.; Graves, Van; Mittig, W.; Morrissey, D. J.; Pellemoine, Frédérique; Portillo, M.; Ronningen, R. M.; Schein, M.; Sherrill, B. M.; Zeller, A. F.

doi:10.1016/j.nimb.2013.06.042

Cited by 73 publications

(26 citation statements)

References 22 publications

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“…Only the mass values of the lower elements will be decisive for the observation of possible shell quenching as it is proposed in several theoretical models. However, experimentally this interesting region can only be accessed by the next generation exotic nuclear beam facilities [62,63,64,65].…”

Section: Discussionmentioning

confidence: 99%

Direct mass measurements of Cd isotopes show strong shell gap at N=82

Knöbel,

Diwisch,

Bosch

et al. 2015

Preprint

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A 238 U projectile beam was used to create cadmium isotopes via abrasion-fission at 410 MeV/u in a beryllium target at the entrance of the in-flight separator FRS at GSI. The fission fragments were separated with the FRS and injected into the isochronous storage ring ESR for mass measurements. The Isochronous Mass Spectrometry (IMS) was performed under two different experimental conditions, with and without Bρ-tagging at the dispersive central focal plane of the FRS. In the experiment with Bρ-tagging the magnetic rigidity of the injected fragments was determined by an accuracy of 2 • 10 −4 . A new method of data analysis, using a correlation matrix for the combined data set from both experiments, has provided mass values for 25 different isotopes for the first time. The high selectivity and sensitivity of the experiment and analysis has given access even to rare isotopes detected with a few atoms per week. In this letter we present for the 129,130,131 Cd isotopes mass values directly measured for the first time. The Cd results clearly show a very pronounced shell effect at N=82 which is in agreement with the conclusion from γ-ray spectroscopy of 130 Cd and confirms the assumptions of modern shell-model calculations.

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Section: Discussionmentioning

confidence: 99%

Direct mass measurements of Cd isotopes show strong shell gap at N=82

Knöbel,

Diwisch,

Bosch

et al. 2015

Preprint

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“…The other major new RIB facilities based on projectile fragmentation have substantially lower primary beam energies: the RI Beam Factory (RIBF) at RIKEN delivers beams with energies up to 440 MeV/nucleon for light ions and 350 MeV/nucleon for very heavy ions [14] while the Facility for Rare Isotope Beams (FRIB) at Michigan State University delivers beam energies of 200 MeV/u for uranium ions and higher energies for lighter ions [15].…”

Section: Nuclear Instruments and Methods Inmentioning

confidence: 99%

Design, construction and cooling system performance of a prototype cryogenic stopping cell for the Super-FRS at FAIR

Ranjan

Dendooven

Purushothaman

et al. 2015

Nuclear Instruments and Methods in Physics Research Section A:

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a b s t r a c tA cryogenic stopping cell for stopping energetic radioactive ions and extracting them as a low energy beam was developed. This first ever cryogenically operated stopping cell serves as prototype device for the Low-Energy Branch of the Super-FRS at FAIR. The cell has a stopping volume that is 1 m long and 25 cm in diameter. Ions are guided by a DC field along the length of the stopping cell and by a combined RF and DC fields provided by an RF carpet at the exit-hole side. The ultra-high purity of the stopping gas required for optimum ion survival is reached by cryogenic operation. The design considerations and construction of the cryogenic stopping cell, as well as some performance characteristics, are described in detail. Special attention is given to the cryogenic aspects in the design and construction of the stopping cell and the cryocooler-based cooling system. The cooling system allows the operation of the stopping cell at any desired temperature between about 70 K and room temperature. The cooling system performance in realistic on-line conditions at the FRS Ion Catcher Facility at GSI is discussed. A temperature of 110 K at which efficient ion survival was observed is obtained after 10 h of cooling. A minimum temperature of the stopping gas of 72 K was reached. The expertise gained from the design, construction and performance of the prototype cryogenic stopping cell has allowed the development of a final version for the Low-Energy Branch of the Super-FRS to proceed.

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“…The heavy-ion beams will be accelerated in a superconducting -RF folded driver linear accelerator, consisting of 46 cryo-modules and 4 superconducting di-pole magnets [3]. The experimental system consists of 14 new superconducting magnets (di-poles and quadrupole triplets) in the target and fragment pre-separator section [4,5]. The experimental system including these new superconducting magnets will interface with the legacy A1900 fragment separator superconducting magnets from the NSCL era [6].…”

Section: Introductionmentioning

confidence: 99%

Design of Cryogenic Heat Exchangers and associated Sub-Systems for Controlled Cool-down and Testing of Superconducting Magnets at FRIB

Hasan

Ganni

Fila

et al. 2022

IOP Conf. Ser.: Mater. Sci. Eng.

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The Facility for Rare Isotope Beams (FRIB) is a continuous wave heavy ion beam linear accelerator designed for a maximum beam energy of 400 kW and using in-flight (fragment) production and separation to generate rare isotope beams. Spatial separation of the isotopes is achieved by using superconducting magnets with a high magnetic field, large aperture, and iron-dominated core. There are a total of 14 superconducting magnets used in the fragment separator section of the facility. Designs for these magnets are relatively new, and it poses challenges in several aspects of the cryogenic design and operation such as, compact coil and cryostat design, thermal shield design, and a controlled cool-down to the operating temperature while avoiding high thermal stresses. Helically coiled finned-tube cryogenic heat exchanger designs are considered for the controlled cool-down of superconducting magnets with up to 22.4 tonnes of cold mass. These heat exchangers use liquid nitrogen cooled helium gas to cool the superconducting magnets. They demonstrate high thermal effectiveness and mechanical flexibility that are essential for the variable operating temperatures (300 – 80 K) experienced during a cool-down process. This paper presents an overview of the process design, analysis, fabrication and operation of cool-down heat exchangers and their associated sub-systems developed at FRIB.

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Design of the Advanced Rare Isotope Separator ARIS at FRIB

Cited by 73 publications

References 22 publications

Direct mass measurements of Cd isotopes show strong shell gap at N=82

Direct mass measurements of Cd isotopes show strong shell gap at N=82

Design, construction and cooling system performance of a prototype cryogenic stopping cell for the Super-FRS at FAIR

Design of Cryogenic Heat Exchangers and associated Sub-Systems for Controlled Cool-down and Testing of Superconducting Magnets at FRIB

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