CRYRING — a synchrotron, cooler and storage ring

Abrahamsson, K.; Andler, G.; Bagge, L.; Beebe, E.; Carlé, P.; Danared, H.; Egnell, S.; Ehrnsten, K.; Engström, M.; Herrlander, C.J.; Hilke, J.; Jeansson, J.; Källberg, A.; Leontein, S.; Liljeby, L.; Nilsson, Ann-Chatrin; Paál, A.; Rensfelt, K.‐G.; Rosengård, U.; Simonsson, Ansgar; Sołtan, A.; Starker, J.; Ugglas, M. af; Filevich, A.

doi:10.1016/0168-583x(93)95341-2

Cited by 133 publications

(28 citation statements)

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“…Recombination spectra of both Na-like ions were measured in separate experiments at the CRYRING storage ring (Abrahamsson et al 1993), located at the Manne Siegbahn Laboratory in Stockholm, Sweden. The ions were produced in an electron cyclotron resonance ion source and were transported to the storage ring.…”

Section: Methodsmentioning

confidence: 99%

Experimental dielectronic recombination rate coefficients for Na-like S VI and Na-like Ar VIII

Orbán¹,

Altun

Källberg

et al. 2009

A&A

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Aims. Absolute recombination rate coefficients for two astrophysically relevant Na-like ions are presented.Methods. Recombination rate coefficients of S vi and Ar viii are determined from merged-beam type experiments at the CRYRING electron cooler. Calculated rate coefficients are used to account for recombination into states that are field-ionized and therefore not detected in the experiment. Results. Dielectronic recombination rate coefficients were obtained over an energy range covering Δ n = 0 core excitations. For Na-like Ar a measurement was also performed over the Δ n = 1 type of resonances. In the low-energy part of the Ar viii spectrum, enhancements of more than one order of magnitude are observed as compared to the calculated radiative recombination. The plasma recombination rate coefficients of the two Na-like ions are compared with calculated results from the literature. In the 10 3 −10 4 K range, large discrepancies are observed between calculated plasma rate coefficients and our data. At higher temperatures, above 10 5 K, in the case of both ions our data is 30% higher than two calculated plasma rate coefficients, other data from the literature having even lower values. Conclusions. Discrepancies below 10 4 K show that at such temperatures even state-of-the-art calculations yield plasma rate coefficients that have large uncertainties. The main reason for these uncertainties are the contributions from low-energy resonances, which are difficult to calculate accurately.

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Section: Methodsmentioning

confidence: 99%

Experimental dielectronic recombination rate coefficients for Na-like S VI and Na-like Ar VIII

Orbán¹,

Altun

Källberg

et al. 2009

A&A

Self Cite

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“…The recombination experiments described here were performed at the heavy-ion storage ring CRYRING, located in the Manne Siegbahn Laboratory at Stockholm University, Sweden (Abrahamsson et al 1993). The singly charged carbon ions were created in a plasmatron ion source, MINIS, and injected into the storage ring.…”

Section: Experiments and Data Analysismentioning

confidence: 99%

Electron–ion Recombination Rate Coefficients for C Ii Forming C I

Ali

Orbán

Mahmood

et al. 2012

ApJ

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We have determined absolute dielectronic recombination rate coefficients for C ii, using the CRYRING heavy-ions storage ring. The resonances due to 2s-2p ( n = 0) core excitations are detected in the center-of-mass energy range of 0-15 eV. The experimental results are compared with intermediate coupling AUTOSTRUCTURE calculations. Plasma rate coefficients are obtained from the DR spectrum by convoluting it with a Maxwell-Boltzmann energy distribution for temperatures in the range of 10 3 -10 6 K. The derived temperature-dependent plasma recombination rate coefficients are presented graphically and parameterized by using a fit formula for convenient use in plasma modeling codes. The experimental rate coefficients are also compared with the theoretical data available in literature. In the temperature range of 10 3 -2 × 10 4 K, our experimental results show that previous calculations severely underestimate the plasma rate coefficients and also our AUTOSTRUCTURE calculation does not reproduce the experimental plasma rate coefficients well. Above 2×10 4 K, the agreement between the experimental and theoretical rate coefficients is much better, and the deviations are smaller than the estimated uncertainties.

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“…The measurement was performed at the CRYRING heavy-ion storage ring (Abrahamsson et al 1993) at the Manne Siegbahn Laboratory in Stockholm. The Ne 5+ ions were produced in an electron cyclotron resonance ion source and injected into the storage ring.…”

Section: Experiments and Data Analysismentioning

confidence: 99%

RECOMBINATION RATE COEFFICIENTS OF BORON-LIKE Ne

Mahmood

Orbán

Ali

et al. 2013

ApJ

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Recombination of Ne 5+ was measured in a merged-beam type experiment at the heavy-ion storage ring CRYRING. In the collision energy range 0-110 eV resonances due to 2s 2 2p → 2s2p 2 (Δn = 0) and 2s 2 2p → 2s 2 3l (Δn = 1), core excitations were observed. The experimentally derived rate coefficients agree well with the calculations obtained using AUTOSTRUCTURE. At low energies, recombination is dominated by resonances belonging to the spinforbidden 2s2p 2 ( 4 P J )nl series. The energy-dependent rate coefficients were convoluted with a Maxwell-Boltzmann electron energy distribution to obtain plasma recombination rate coefficients. The data from the literature deviate from the measured results at low temperature.

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CRYRING — a synchrotron, cooler and storage ring

Cited by 133 publications

References 1 publication

Experimental dielectronic recombination rate coefficients for Na-like S VI and Na-like Ar VIII

Experimental dielectronic recombination rate coefficients for Na-like S VI and Na-like Ar VIII

Electron–ion Recombination Rate Coefficients for C Ii Forming C I

RECOMBINATION RATE COEFFICIENTS OF BORON-LIKE Ne

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