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Commissioning of the DESIREE storage rings - a new facility for cold ion-ion collisions

Journal article
Authors M. Gatchell
HT Schmidt
RD Thomas
S Rosén
P Reinhed
P Löfgren
L Brännholm
L Blom
M Björkhage
E Bäckström
JD Alexander
S Leontein
Dag Hanstorp
H Zettergren
L Liljeby
A Källberg
A Simonsson
F Hellberg
S Mannervik
M Larsson
WD Geppert
KG Rensfelt
H Danared
A Paál
M Masuda
P Halldén
G Andler
MH Stockett
T Chen
G Källersjö
J Weimer
Klavs Hansen
H Hartman
H Cederquist
Published in Journal of Physics, Conference Series
Volume 488
Issue section 1
Pages 012040
ISSN 1742-6588
Publication year 2014
Published at Department of Physics (GU)
Pages 012040
Language en
Links http://dx.doi.org/10.1088/1742-659...
Keywords electrostatic storage ring
Subject categories Atomic physics, Molecular physics, Accelerator Physics and Instrumentation

Abstract

We report on the ongoing commissioning of the Double ElectroStatic Ion Ring ExpEriment, DESIREE, at Stockholm University. Beams of atomic carbon anions (C􀀀) and smaller carbon anion molecules (C􀀀2 , C􀀀3 , C􀀀4 etc.) have been produced in a sputter ion source, accelerated to 10 keV or 20 keV, and stored successfully in the two electrostatic rings. The rings are enclosed in a common vacuum chamber cooled to below 13 Kelvin. The DESIREE facility allows for studies of internally relaxed single isolated atomic, molecular and cluster ions and for collision experiments between cat- and anions down to very low center-of-mass collision energies (meV scale). The total thermal load of the vacuum chamber at this temperature is measured to be 32 W. The decay rates of stored ion beams have two components: a on-exponential component caused by the space charge of the beam itself which dominates at early times and an exponential term from the neutralization of the beam in collisions with residual gas at later times. The residual gas limited storage lifetime of carbon anions in the symmetric ring is over seven minutes while the 1=e lifetime in the asymmetric ring is measured to be about 30 seconds. Although we aim to improve the storage in the second ring, the number of stored ions are now sufficient for many merged beams experiments with positive and negative ions requiring milliseconds to seconds ion storage.

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