Design of Faraday cup ion detectors built by thin film deposition

Szalkowski, G. A.; Darrow, D. S. ; Cecil, F. E.
Issue date: 2017
Creative Commons Attribution 4.0 International (CC BY)
Cite as:
Szalkowski, G. A., Darrow, D. S., & Cecil, F. E. (2017). Design of Faraday cup ion detectors built by thin film deposition [Data set]. Princeton Plasma Physics Laboratory, Princeton University.
  author      = {Szalkowski, G. A. and
                Darrow, D. S. and
                Cecil, F. E.},
  title       = {{Design of Faraday cup ion detectors buil
                t by thin film deposition}},
  publisher   = {{Princeton Plasma Physics Laboratory, Pri
                nceton University}},
  year        = 2017,
  url         = {}

Thin film Faraday cup detectors can provide measurements of fast ion loss from magnetically confined fusion plasmas. These multilayer detectors can resolve the energy distribution of the lost ions in addition to giving the total loss rate. Prior detectors were assembled from discrete foils and insulating sheets. Outlined here is a design methodology for creating detectors using thin film deposition that are suited to particular scientific goals. The intention is to use detectors created by this method on JET and NSTX-U. The detectors will consist of alternating layers of aluminum and silicon dioxide, with layer thicknesses chosen to isolate energies of interest. Thin film deposition offers the advantage of relatively simple and more mechanically robust construction compared to other methods, as well as allowing precise control of film thickness. Furthermore, this depositional fabrication technique places the layers in intimate thermal contact, providing for three-dimensional conduction and dissipation of the ion-produced heating in the layers, rather than the essentially two-dimensional heat conduction in the discrete foil stack implementation.

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