Space-charge effects in Penning ion traps
- Porobic, T.
- Beck, M.
- Breitenfeldt, M.
- Couratin, C.
- Finlay, P.
- Knecht, A.
- Fabian, X.
- Friedag, P.
- Fléchard, X.
- Liénard, E.
- Ban, G.
- Zákoucky, D.
- Soti, G.
- van Gorp, S.
- Weinheimer, Ch.
- Wursten, E.
- Severijns, N.
DOIAbstract
International audienceThe 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 39 K + 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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