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Title: The cryogenic storage ring CSR

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{sup −3} is derived, equivalent to a room-temperature pressure below 10{sup −14} mbar. Fast atomic, molecular, and cluster ion beams stored for long periods of time in a cryogenic environment willmore » allow experiments on collision- and radiation-induced fragmentation processes of ions in known internal quantum states with merged and crossed photon and particle beams.« less

Authors:
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ;  [1] more »; « less
  1. Max-Planck-Institut für Kernphysik, 69117 Heidelberg (Germany)
Publication Date:
OSTI Identifier:
22597965
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 87; Journal Issue: 6; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ANIONS; BEAM OPTICS; CATIONS; CRYOSTATS; DENSITY; ENERGY DEPENDENCE; FRAGMENTATION; HELIUM; ION BEAMS; ION PAIRS; KEV RANGE 100-1000; KEV RANGE 10-100; KINETIC ENERGY; LIQUIDS; PARTICLE BEAMS; PHOTONS; QUANTUM STATES; SPECTRA; STORAGE RINGS; TEMPERATURE RANGE 0273-0400 K

Citation Formats

Hahn, R. von, Becker, A., Berg, F., Blaum, K., Fadil, H., Fellenberger, F., Froese, M., George, S., Göck, J., Grieser, M., Grussie, F., Guerin, E. A., Herwig, P., Karthein, J., Krantz, C., Kreckel, H., Lange, M., Laux, F., Lohmann, S., Menk, S., and and others. The cryogenic storage ring CSR. United States: N. p., 2016. Web. doi:10.1063/1.4953888.
Hahn, R. von, Becker, A., Berg, F., Blaum, K., Fadil, H., Fellenberger, F., Froese, M., George, S., Göck, J., Grieser, M., Grussie, F., Guerin, E. A., Herwig, P., Karthein, J., Krantz, C., Kreckel, H., Lange, M., Laux, F., Lohmann, S., Menk, S., & and others. The cryogenic storage ring CSR. United States. doi:10.1063/1.4953888.
Hahn, R. von, Becker, A., Berg, F., Blaum, K., Fadil, H., Fellenberger, F., Froese, M., George, S., Göck, J., Grieser, M., Grussie, F., Guerin, E. A., Herwig, P., Karthein, J., Krantz, C., Kreckel, H., Lange, M., Laux, F., Lohmann, S., Menk, S., and and others. Wed . "The cryogenic storage ring CSR". United States. doi:10.1063/1.4953888.
@article{osti_22597965,
title = {The cryogenic storage ring CSR},
author = {Hahn, R. von and Becker, A. and Berg, F. and Blaum, K. and Fadil, H. and Fellenberger, F. and Froese, M. and George, S. and Göck, J. and Grieser, M. and Grussie, F. and Guerin, E. A. and Herwig, P. and Karthein, J. and Krantz, C. and Kreckel, H. and Lange, M. and Laux, F. and Lohmann, S. and Menk, S. and and others},
abstractNote = {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{sup −3} is derived, equivalent to a room-temperature pressure below 10{sup −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.},
doi = {10.1063/1.4953888},
journal = {Review of Scientific Instruments},
number = 6,
volume = 87,
place = {United States},
year = {Wed Jun 15 00:00:00 EDT 2016},
month = {Wed Jun 15 00:00:00 EDT 2016}
}