The Cryogenic Storage Ring CSR
| Autor: | A. Shornikov, T. Sieber, Andreas Wolf, Christian Breitenfeldt, J. Göck, M. Froese, Manfred Grieser, C. D. Schröter, Philipp Herwig, Stephen Vogel, Sunil Kumar, E. A. Guerin, P. Wilhelm, P M Mishra, R. von Hahn, Felix Laux, Dmitri A. Orlov, Stefan Schippers, J. Karthein, Klaus Blaum, Roland Repnow, H. Fadil, Sebastian George, Daniel Zajfman, F. Fellenberger, S. Menk, Xavier Urbain, Dirk Schwalm, K. Spruck, O. Novotný, Oded Heber, Claude Krantz, Lutz Schweikhard, S. Saurabh, A. Becker, Florian Grussie, A. P. O'Connor, Christian Meyer, F. Berg, Michael Rappaport, Holger Kreckel, Michael Lange, Joachim Ullrich, Svenja Lohmann |
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| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
Accelerator Physics (physics.acc-ph)
Cryostat Speichertechnik - Abteilung Blaum Photon Materials science Atomic Physics (physics.atom-ph) FOS: Physical sciences 02 engineering and technology Cryogenics Kinetic energy 01 natural sciences 7. Clean energy law.invention Ion Physics - Atomic Physics law Physics - Chemical Physics 0103 physical sciences Physics - Atomic and Molecular Clusters 010306 general physics Instrumentation Chemical Physics (physics.chem-ph) Liquid helium 021001 nanoscience & nanotechnology Physics::Accelerator Physics Physics - Accelerator Physics Atomic physics Atomic and Molecular Clusters (physics.atm-clus) 0210 nano-technology Storage ring Beam (structure) |
| Zdroj: | Review of Scientific Instruments |
| Popis: | An electrostatic cryogenic storage ring, CSR, for beams of anions and cations with up to 300 keV kinetic energy per unit charge has been designed, constructed and put into operation. With a circumference of 35 m, the ion-beam vacuum chambers and all beam optics are in a cryostat and cooled by a closed-cycle liquid helium system. At temperatures as low as (5.5 $\pm$ 1) K inside the ring, storage time constants of several minutes up to almost an hour were observed for atomic and molecular, anion and cation beams at an energy of 60 keV. The ion-beam intensity, energy-dependent closed-orbit shifts (dispersion) and the focusing properties of the machine were studied by a system of capacitive pickups. The Schottky-noise spectrum of the stored ions revealed a broadening of the momentum distribution on a time scale of 1000 s. Photodetachment of stored anions was used in the beam lifetime measurements. The detachment rate by anion collisions with residual-gas molecules was found to be extremely low. A residual-gas density below 140 cm$^{-3}$ is derived, equivalent to a room-temperature pressure below 10$^{-14}$ mbar. Fast atomic, molecular and cluster ion beams stored for long periods of time in a cryogenic environment will allow experiments on collision- and radiation-induced fragmentation processes of ions in known internal quantum states with merged and crossed photon and particle beams. PDFLaTeX with 17 pages, 16 figures, 2 tables. This article has been accepted by Review of Scientific Instruments. After it is published, it will be found at http://scitation.aip.org/content/aip/journal/rsi |
| Databáze: | OpenAIRE |
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