First storage of ion beams in the Double Electrostatic Ion-Ring Experiment: DESIREE

Schmidt, H. T.; Thomas, Richard; Gatchell, Michael; Rosén, S.; Reinhed, Peter; Löfgren, Patrik; Brännholm, Lars; Blom, Mikael; Björkhage, Mikael; Bäckström, Erik; Alexander, John D.; Leontein, S.; Hanstorp, Dag; Zettergren, Henning; Liljeby, L.; Källberg, A.; Simonsson, Ansgar; Hellberg, F.; Mannervik, S.; Larsson, Mats; Geppert, Wolf D.; Rensfelt, K.‐G.; Danared, H.; Paál, A.; Masuda, Masaharu; Halldén, Per; Andler, G.; Stockett, Mark H.; Chen, Tao; Källersjö, Gunnar; Weimer, Jan; Hansen, Klavs; Hartman, Henrik; Cederquist, H.

doi:10.1063/1.4807702

Cited by 129 publications

(88 citation statements)

References 23 publications

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“…Our experimental results differ by 1.3σ from the only available theoretical prediction [P. We have constructed an electrostatic ion storage ring for operation at cryogenic temperatures [1]. This allows storage of keV ions for extended periods of time [2], and, as will be demonstrated here, measurements of lifetimes of metastable states in negative ions in a completely new time domain ranging up to several minutes and beyond.…”

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confidence: 91%

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Negative Ions in Cold Storage

Wolf

2015

Physics

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We use a novel electrostatic ion storage ring to measure the radiative lifetime of the upper level in the 3p 5 2 P o 1=2 → 3p 5 2 P o 3=2 spontaneous radiative decay in 32 S − to be 503 AE 54 sec. This is by orders of magnitude the longest lifetime ever measured in a negatively charged ion. Cryogenic cooling of the storage ring gives a residual-gas pressure of a few times 10 −14 mbar at 13 K and storage of 10 keV sulfur anions for more than an hour. Negative atomic ions are unique quantum systems. Because of the absence of a long-range 1=r potential, there are only one or a few bound quantum states with typical binding energies below a few eV. Direct interactions between the electrons-so-called electron correlation effects-thus, play much more important roles than in positively charged or neutral systems. This sensitivity makes measurements of long lifetimes in negative ions important benchmarkers for many-body treatments of electronic interactions in atomic systems [3][4][5].The 2 P o 3=2 ground-state level in 32 S − is bound by 2.077 104 1(7) eV with respect to the neutral atom [6]; see Fig. 1

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confidence: 91%

“…Our newly developed ion storage ring is cooled to 13 K, which gives an extremely low pressure of a few times 10 −14 mbar and an estimated residual-gas density of about 2 × 10 4 cm −3 [2] . This allows storage of negative ions for an hour and longer.…”

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confidence: 99%

Negative Ions in Cold Storage

Wolf

2015

Physics

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“…In the detector, the product particles hit a secondary-electron emitting cathode (10). These electrons (11) are accelerated towards a micro-channel plate stack (12) where they are multiplied to form the detector current pulse. For off-beam testing, the detector can be irradiated by an ultra-violet (UV) light emitting diode (LED, 13) installed in the opposite sector of CSR.…”

Section: Overview Of the Experimental Set-upmentioning

confidence: 99%

“…They use purely electrostatic ion optics, matching the output energy of relatively simple electrostatic injectors that can be flexibly equipped with state-of-the art molecular ion sources [8][9][10]. The most advanced set-ups use cryogenic cooling machines to reduce the temperature of their beam guiding vacuum vessels down to values near that of liquid helium [11][12][13][14][15]. On the one hand, this results in a vastly improved residual gas pressure compared to conventional ultra-high vacuum (UHV) set-ups, with correspondingly longer ion storage times [16,17].…”

Section: Introductionmentioning

confidence: 99%

Single-particle detection of products from atomic and molecular reactions in a cryogenic ion storage ring

Krantz

Novotný

Becker

et al. 2017

Nuclear Instruments and Methods in Physics Research Section A:

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We have used a single-particle detector system, based on secondary electron emission, for counting low-energetic (∼ keV/u) massive products originating from atomic and molecular ion reactions in the electrostatic Cryogenic Storage Ring (CSR). The detector is movable within the cryogenic vacuum chamber of CSR, and was used to measure production rates of a variety of charged and neutral daughter particles. In operation at a temperature of ∼ 6 K, the detector is characterised by a high dynamic range, combining a low dark event rate with good high-rate particle counting capability. On-line measurement of the pulse height distributions proved to be an important monitor of the detector response at low temperature. Statistical pulse-height analysis allows to infer the particle detection efficiency of the detector, which has been found to be close to unity also in cryogenic operation at 6 K.

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“…A special interest exists in collisions between positive and negative ions, in particular, with hydrogen anions, collisions leading to neutralization processes. Recently, this kind of interest has been growing up due to the experiments carrying out within the Double ElectroStatic Ion Ring ExpEriment (DESIREE) project [4,5], see also [6] for the CSR Supplementary material in the form of one zip file available from the Journal web page at https://doi.org/10.1140/epjd/e2017-80390- 4.…”

Section: Introductionmentioning

confidence: 99%