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First storage of ion beams in the Double Electrostatic Ion-Ring Experiment - DESIREE

Journal article
Authors H.T. Schmidt
R. D. Thomas
M. Gatchell
S. Rosen
Dag Hanstorp
Klavs Hansen
et al.
Published in Review of Scientific Instruments
Volume 84
Issue 5
Pages artikel nr 055115
ISSN 0034-6748
Publication year 2013
Published at Department of Physics (GU)
Pages artikel nr 055115
Language en
Links dx.doi.org/10.1063/1.4807702
Keywords ion storage ring, DESIREE
Subject categories Physical Sciences, Atom and Molecular Physics and Optics, Accelerator Physics and Instrumentation

Abstract

We report on the first storage of ion beams in the Double ElectroStatic Ion Ring ExpEriment, DESIREE, at Stockholm University. We have produced beams of atomic carbon anions and small carbon anion molecules (Cn- , n = 1, 2, 3, 4) in a sputter ion source. The ion beams were accelerated to 10 keV kinetic energy and stored in an electrostatic ion storage ring enclosed in a vacuum chamber at 13 K. For 10 keV C2- molecular anions we measure the residual-gas limited beam storage lifetime to be 448 s ± 18 s with two independent detector systems. Using the measured storage lifetimes we estimate that the residual gas pressure is in the 10−14 mbar range. When high current ion beams are injected, the number of stored particles does not follow a single exponential decay law as would be expected for stored particles lost solely due to electron detachment in collision with the residual-gas. Instead, we observe a faster initial decay rate, which we ascribe to the effect of the space charge of the ion beam on the storage capacity.

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