Note: Effect of photodiode aluminum cathode frame on spectral sensitivity in the soft x-ray energy band

M.B. McGarry, P. Franz, D.J. Den Hartog, J.A. Goetz, J. Johnson

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Silicon photodiodes used for soft x-ray detection typically have a thin metal electrode partially covering the active area of the photodiode, which subtly alters the spectral sensitivity of the photodiode. As a specific example, AXUV4BST photodiodes from International Radiation Detectors have a 1.0 μm thick aluminum frame covering 19% of the active area of the photodiode, which attenuates the measured x-ray signal below ∼6 keV. This effect has a small systematic impact on the electron temperature calculated from measurements of soft x-ray bremsstrahlung emission from a high-temperature plasma. Although the systematic error introduced by the aluminum frame is only a few percent in typical experimental conditions on the Madison Symmetric Torus, it may be more significant for other instruments that use similar detectors.
Original languageEnglish
Article number096105
Pages (from-to)-
JournalReview of Scientific Instruments
Volume85
Issue number9
DOIs
Publication statusPublished - 1 Sep 2014
Externally publishedYes

    Fingerprint

All Science Journal Classification (ASJC) codes

  • Instrumentation

Cite this