Untitled

Katayama, Ichiro; Wada, M.; Kawakami, H.; Tanaka, J.; Noda, K.

doi:10.1023/a:1012609024448

Cited by 27 publications

(8 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The most common ion guidance uses a static electric field to push ions towards the exit-hole side of the stopping volume where the ions encounter an RF electrode structure in the shape of a carpet or a funnel [25,[27][28][29]. Such structures were pioneered by Masuda et al [30][31][32].…”

Section: Stopping Cell: Some Basic Considerationsmentioning

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:

View full text Add to dashboard Cite

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.

show abstract

Section: Stopping Cell: Some Basic Considerationsmentioning

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:

View full text Add to dashboard Cite

show abstract

“…The so-called cyclotron gas stopper takes advantage of the focusing properties of a cyclotron-type magnet that can confine ions in the radial and axial dimensions during the deceleration process. Systems of this kind have been successfully used to stop antiprotons, pions and muons [30] and has been proposed [16] for stopping light ions. Fig.…”

Section: Cyclotron Gas Stoppermentioning

confidence: 99%

“…After leaving the stopping chamber linear RF multipole ion guides are usually employed to guide the ions into high-vacuum where they are accelerated to form a low-emittance low-energy beam. In present gas stopper systems for rare isotopes ion transport is either obtained by static electric fields combined with gas flow or by gas flow combined with static and RF fields, created by electrode geometries named RF funnels, RF carpets, or RF walls [6,16]. The common feature of all devices that involve RF for ion transport E-mail addresses: bollen@frib.msu.edu, bollen@nscl.msu.edu along surfaces is the use of a series of parallel or concentric electrodes to which RF voltages are applied with a 180 • phase difference between adjacent electrodes.…”

Section: Introductionmentioning

confidence: 99%

“Ion surfing” with radiofrequency carpets

Bollen

2011

International Journal of Mass Spectrometry

View full text Add to dashboard Cite

“…The cyclotron stopper technique was proposed by Katayama et al [7] and a detailed study by Bollen et al [8] was recently published. This approach involves the use of a weakly focusing cyclotron magnet which provides ions an essentially unlimited path length due to cyclotron motion, allowing the use of gas pressures significantly lower than current techniques.…”

Section: Proposed Conceptmentioning

confidence: 99%

A study of the cyclotron gas-stopping concept for the production of rare isotope beams

Sternberg¹,

Savard²

2008

Nuclear Instruments and Methods in Physics Research Section A:

View full text Add to dashboard Cite

The proposed cyclotron gas-stopping scheme for the efficient thermalization of intense rare isotope beams is examined. Simulations expand on previous studies and expose many complications of such an apparatus arising from physical effects not accounted for properly in previous work. The previously proposed cyclotron gas-stopper geometry is found to have a near null efficiency, but extended simulations suggest that a device with a much larger pole gap could achieve a stopping efficiency approaching roughly 90% and at least a 10 times larger acceptance. However, some of the advantages that were incorrectly predicted in previous simulations for high intensity operation of this device are compromised.

show abstract

Untitled

Cited by 27 publications

References 1 publication

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

“Ion surfing” with radiofrequency carpets

A study of the cyclotron gas-stopping concept for the production of rare isotope beams

Contact Info

Product

Resources

About