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Space-charge effects in Penning ion traps

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 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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Submitted on : Thursday, March 19, 2015 - 3:51:37 PM
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T. Porobic, M. Beck, M. Breitenfeldt, C. Couratin, P. Finlay, et al.. Space-charge effects in Penning ion traps. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Elsevier, 2015, 785, pp.153-162. ⟨10.1016/j.nima.2015.02.057⟩. ⟨in2p3-01133535⟩

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