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Photo-recombination studies at R-EBIT with a Labview control and data = quisition system
Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
Visa övriga samt affilieringar
2011 (Engelska)Ingår i: Journal of Instrumentation, ISSN 1748-0221, E-ISSN 1748-0221, Vol. 6, s. C01016-Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Equipment at the Stockholm Refrigerated Electron Beam Ion Trap (R-EBIT) was developed for photo-recombination studies. A LabView-based event mode data acquisition and R-EBIT control system was implemented. The energies of KLL dielectronic recombination resonances in Li- to C-like argon ions were determined and compared with theoretical calculations performed using a distorted wave approximation. The theoretical and experimental peak positions for Li-, Be-, and C-like argon ions agree within the error bars. For B-like argon we observe an energy shift of 9 eV between the experimentally obtained peak position and the calculated result.

Ort, förlag, år, upplaga, sidor
2011. Vol. 6, s. C01016-
Nyckelord [en]
Ion sources (positive ions, negative ions, electron cyclotron = sonance (ECR), electron beam (EBIS)), X-ray detectors
Nationell ämneskategori
Atom- och molekylfysik och optik
Forskningsämne
fysik
Identifikatorer
URN: urn:nbn:se:su:diva-66650DOI: 10.1088/1748-0221/6/01/C01016ISI: 000291345600021OAI: oai:DiVA.org:su-66650DiVA, id: diva2:468189
Anmärkning
7Tillgänglig från: 2011-12-20 Skapad: 2011-12-20 Senast uppdaterad: 2017-12-08Bibliografiskt granskad
Ingår i avhandling
1. Electron - Ion Recombination Data for Plasma Applications: Results from Electron Beam Ion Trap and Ion Storage Ring
Öppna denna publikation i ny flik eller fönster >>Electron - Ion Recombination Data for Plasma Applications: Results from Electron Beam Ion Trap and Ion Storage Ring
2012 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

This thesis contains results of electron-ion recombination processes in atomic ions relevant for plasma applications. The measurements were performed at the Stockholm Refrigerated Electron Beam Ion Trap (R-EBIT) and at the CRYRING heavy-ion storage ring. Dielectronic recombination (DR) cross sections, resonant strengths, rate coefficients and energy peak positions in H-like and He-like S are obtained for the first time from the EBIT measurements. Furthermore, the experimentally obtained DR resonant strengths are used to check the behaviour of a scaling formula for low Z, H-and He-like iso-electronic sequences and to update the fitting parameters. KLL DR peak positions for initially He- to B-like Ar ions are obtained experimentally from the EBIT measurements. Both the results from highly charged sulfur and argon are compared with the calculations performed with a distorted wave approximation.

Absolute recombination rate coefficients of B-like C, B-like Ne and Be-like F ions are obtained for the first time with high energy resolution from storage ring measurements. The experimental results are compared with the intermediate coupling AUTOSTRUCTURE calculations. Plasma rate coefficients of each of these ions are obtained by convoluting the energy dependent recombination spectra with a Maxwell-Boltzmann energy distribution in the temperature range of 103-106 K. The resulting plasma rate coefficients are presented and compared with the calculated data available in literature.

Ort, förlag, år, upplaga, sidor
Stockholm: Department of Physics, Stockholm University, 2012. s. 64
Nyckelord
Highly charged ions, Atomic processes, Atomic data, Electron-ion recombination, Plasmas
Nationell ämneskategori
Fysik Atom- och molekylfysik och optik
Forskningsämne
fysik
Identifikatorer
urn:nbn:se:su:diva-75311 (URN)978-91-7447-497-8 (ISBN)
Disputation
2012-05-14, sal FA31, AlbaNova universitetscentrum, Roslagstullsbacken 21, Stockholm, 10:00 (Engelska)
Opponent
Handledare
Anmärkning

At the time of the doctoral defense, the following papers were unpublished and had a status as follows: Paper 4: Accepted. Paper 5: Accepted. Paper 6: Manuscript. Paper 7: Manuscript.

Tillgänglig från: 2012-04-22 Skapad: 2012-04-14 Senast uppdaterad: 2013-08-20Bibliografiskt granskad
2. Interaction of atomic ions with electrons: Recombination rate coefficients for C1+, F5+, Ne5+, S14+,S15+
Öppna denna publikation i ny flik eller fönster >>Interaction of atomic ions with electrons: Recombination rate coefficients for C1+, F5+, Ne5+, S14+,S15+
2012 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

This thesis concentrates on electron-ion interaction studies, in particular focusing on dielectronic recombination (DR) of highly charged ions relevant to astrophysics and plasma physics. The measurements were performed at the Stockholm Refrigerated Electron Beam Ion Trap (R-EBIT) and at the CRYRING heavy-ion storage ring. For the R-EBIT measurements a newly developed time-of-flight (TOF) technique for separation of ions and detecting the charge state distribution was utilized. By using ion intensities derived from the TOF spectra as input parameters in the rate equations, energy dependent DR rate coefficients for S15+ and S14+ ions were obtained for the first time. Resonance energies and cross sections calculated within the relativistic many-body perturbation theory for S15+ agree well with the experimental data. In addition to the TOF spectra, the x-ray spectra have been also collected. The combination of these two measurements allows us to separate the photo-recombination and the excitation spectra, from which the excitation rate coefficients for S15+ and S14+ ions were extracted.

From the storage ring measurements absolute recombination rate coefficients for C1+, F5+, and Ne5+ions as a function of electron-ion collision energy were obtained. These were reported for the first time with high energy resolution. The experimental results were compared with results obtained from AUTOSTRUCTURE calculations. Temperature dependent rate coefficients have been also derived for the studied ions and compared with calculations available in the literature.

Ort, förlag, år, upplaga, sidor
Stockholm: Department of Physics, Stockholm University, 2012. s. 71
Nationell ämneskategori
Atom- och molekylfysik och optik
Forskningsämne
fysik
Identifikatorer
urn:nbn:se:su:diva-75912 (URN)978-91-7447-529-6 (ISBN)
Disputation
2012-06-11, FB41, AlbaNova universitetscentrum, Roslagstullsbacken 21, Stockholm, 14:00 (Engelska)
Opponent
Handledare
Anmärkning

At the time of the doctoral defense, the following papers were unpublished and had a status as follows: Paper 1: Accepted. Paper 5: Manuscript. Paper 6: Accepted. Paper 7: Manuscript.

Tillgänglig från: 2012-05-10 Skapad: 2012-05-03 Senast uppdaterad: 2013-08-20Bibliografiskt granskad

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