Journalartikel
Autorenliste: von Hahn, R.; Becker, A.; Berg, F.; Blaum, K.; Breitenfeldt, C.; Fadil, H.; Fellenberger, F.; Froese, M.; George, S.; Goeck, J.; Grieser, M.; Grussie, F.; Guerin, E. A.; Heber, O.; Herwig, P.; Karthein, J.; Krantz, C.; Kreckel, H.; Lange, M.; Laux, F.; Lohmann, S.; Menk, S.; Meyer, C.; Mishra, P. M.; Novotny, O.; O'Connor, A. P.; Orlov, D. A.; Rappaport, M. L.; Repnow, R.; Saurabh, S.; Schippers, S.; Schroeter, C. D.; Schwalm, D.; Schweikhard, L.; Sieber, T.; Shornikov, A.; Spruck, K.; Kumar, S. Sunil; Ullrich, J.; Urbain, X.; Vogel, S.; Wilhelm, P.; Wolf, A.; Zajfman, D.
Jahr der Veröffentlichung: 2016
Zeitschrift: Review of Scientific Instruments
Bandnummer: 87
Heftnummer: 6
ISSN: 0034-6748
eISSN: 1089-7623
Open Access Status: Green
DOI Link: https://doi.org/10.1063/1.4953888
Verlag: American Institute of Physics
Abstract:
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 +/- 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. Published by AIP Publishing.
Zitierstile
Harvard-Zitierstil: von Hahn, R., Becker, A., Berg, F., Blaum, K., Breitenfeldt, C., Fadil, H., et al. (2016) The cryogenic storage ring CSR, Review of Scientific Instruments, 87(6), Article 063115. https://doi.org/10.1063/1.4953888
APA-Zitierstil: von Hahn, R., Becker, A., Berg, F., Blaum, K., Breitenfeldt, C., Fadil, H., Fellenberger, F., Froese, M., George, S., Goeck, J., Grieser, M., Grussie, F., Guerin, E., Heber, O., Herwig, P., Karthein, J., Krantz, C., Kreckel, H., Lange, M., ...Zajfman, D. (2016). The cryogenic storage ring CSR. Review of Scientific Instruments. 87(6), Article 063115. https://doi.org/10.1063/1.4953888
Schlagwörter
DISSOCIATIVE RECOMBINATION; PHYSICS
