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Title	Space-charge effects in Penning ion traps
Author(s)	Porobić, T (KU Leuven, Dept. Phys. Astron.) ; Beck, M (Munster U.) ; Breitenfeldt, M (KU Leuven, Dept. Phys. Astron.) ; Couratin, C (Caen U.) ; Finlay, P (KU Leuven, Dept. Phys. Astron.) ; Knecht, A (KU Leuven, Dept. Phys. Astron. ; CERN) ; Fabian, X (Caen U.) ; Friedag, P (Munster U.) ; Fléchard, X (Caen U.) ; Liénard, E (Caen U.) ; Ban, G (Caen U.) ; Zákoucký, D (Rez, Nucl. Phys. Inst.) ; Soti, G (KU Leuven, Dept. Phys. Astron.) ; Van Gorp, S (KU Leuven, Dept. Phys. Astron.) ; Weinheimer, Ch (Munster U.) ; Wursten, E (KU Leuven, Dept. Phys. Astron.) ; Severijns, N (KU Leuven, Dept. Phys. Astron.)
Publication	2015
Number of pages	10
In:	Nucl. Instrum. Methods Phys. Res., A 785 (2015) 153-162
DOI	10.1016/j.nima.2015.02.057
Subject category	Nuclear Physics - Experiment
Accelerator/Facility, Experiment	CERN ISOLDE ; IS433
Abstract	The influence of space-charge on ion cyclotron resonances and magnetron eigenfrequency in a gas-filled Penning ion trap has been investigated. Off-line measurements with View the MathML source using the cooling trap of the WITCH retardation spectrometer-based setup at ISOLDE/CERN were performed. Experimental ion cyclotron resonances were compared with ab initio Coulomb simulations and found to be in agreement. As an important systematic effect of the WITCH experiment, the magnetron eigenfrequency of the ion cloud was studied under increasing space-charge conditions. Finally, the helium buffer gas pressure in the Penning trap was determined by comparing experimental cooling rates with simulations.
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