Modified Thomson spectrometer design for high energy, multi-species ion sources

Gwynne, D and Kar, S. and Doria, D. and Ahmed, H. and Cerchez, M. and Fernandez, J. and Gray, Ross and Green, J. and Hanton, F and MacLellan, David and McKenna, Paul and Najmudin, Z. and Neely, David and Ruiz, J.A. and Schiavi, A. and Streeter, M. J. V. and Willi, O. and Zepf, M. and Borghesi, M. (2014) Modified Thomson spectrometer design for high energy, multi-species ion sources. Review of Scientific Instruments, 85 (3). 033304. ISSN 0034-6748 (

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A modification to the standard Thomson parabola spectrometer is discussed, which is designed to measure high energy (tens of MeV/nucleon), broad bandwidth spectra of multi-species ions accelerated by intense laser plasma interactions. It is proposed to implement a pair of extended, trapezoidal shaped electric plates, which will not only resolve ion traces at high energies, but will also retain the lower energy part of the spectrum. While a longer (along the axis of the undeflected ion beam direction) electric plate design provides effective charge state separation at the high energy end of the spectrum, the proposed new trapezoidal shape will enable the low energy ions to reach the detector, which would have been clipped or blocked by simply extending the rectangular plates to enhance the electrostatic deflection.