New stopping cell capabilities: RF carpet performance at high gas density and cryogenic operation

Ranjan, M.; Purushothaman, S.; Dickel, T.; Geißel, H.; Plaß, W. R.; Schäfer, D.; Scheidenberger, C.; Walle, J. Van de; Weick, H.; Dendooven, P.

doi:10.1209/0295-5075/96/52001

Cited by 67 publications

(42 citation statements)

References 19 publications

(25 reference statements)

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“…A short technical description and the results of off-line commissioning of the cryogenic stopping cell have been published by Ranjan et al [16]. The first results of the on-line performance of the stopping cell at the FRS Ion Catcher Facility (which is discussed by Plaß et al [17]) are reported by Purushothaman et al [18].…”

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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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 prototype of the gas stopper with a stopping volume of 1m length has been successfully tested off-line [9] using 219 Rn ions from alpha decay of 223 Ra. This new prototype operates at cryogenic temperatures in order to ensure the purity of the helium which is used as stopping gas.…”

Section: Low-energy Branchmentioning

confidence: 99%

The NUSTAR program at FAIR

Herlert

2014

EPJ Web of Conferences

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Abstract. The NUSTAR Collaboration brings together several hundred scientists to form one of the four scientific pillars of the future FAIR facility. NUSTAR aims at the exploitation of intense radioactive beams with energies up to 1.5 GeV/u in order to explore nuclei with large neutron or proton excess. The project has evolved over the last years and now reached a state where a large fraction of the core program is financed, partly built, and even ready for operation. With the signing of the FAIR convention in 2010 and the start of construction, the sub-projects in NUSTAR gain momentum and look forward to commissioning and first beams in this decade. The present status of the project will be presented, focusing on the instrumentation to be applied in the various experimental areas behind the Super-FRS fragment separator, which is the central instrument of NUSTAR.

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“…A special implantation device is a gas-filled Cryogenic Stopping Cell (CSC) [18] characterized by an areal density of a few mg/cm 2 pure He gas. This extremely-small thickness represents a challenge for the energy compression of relativistic fragments with a monoenergetic degrader [19].…”

Section: -P4mentioning

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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New stopping cell capabilities: RF carpet performance at high gas density and cryogenic operation

Cited by 67 publications

References 19 publications

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

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

The NUSTAR program at FAIR

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

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