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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: James C. Wyant
  • Vol. 46, Iss. 24 — Aug. 20, 2007
  • pp: 6069–6075

High-efficiency fast scintillators for “optical” soft x-ray arrays for laboratory plasma diagnostics

L. F. Delgado-Aparicio, D. Stutman, K. Tritz, R. Vero, M. Finkenthal, G. Suliman, R. Kaita, R. Majeski, B. Stratton, L. Roquemore, and C. Tarrio  »View Author Affiliations


Applied Optics, Vol. 46, Issue 24, pp. 6069-6075 (2007)
http://dx.doi.org/10.1364/AO.46.006069


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Abstract

Scintillator-based “optical” soft x-ray (OSXR) arrays have been investigated as a replacement for the conventional silicon (Si)-based diode arrays used for imaging, tomographic reconstruction, magnetohydrodynamics, transport, and turbulence studies in magnetically confined fusion plasma research. An experimental survey among several scintillator candidates was performed, measuring the relative and absolute conversion efficiencies of soft x rays to visible light. Further investigations took into account glass and fiber-optic faceplates (FOPs) as substrates, and a thin aluminum foil ( 150   nm ) to reflect the visible light emitted by the scintillator back to the optical detector. Columnar (crystal growth) thallium-doped cesium iodide (CsI:Tl) deposited on an FOP, was found to be the best candidate for the previously mentioned plasma diagnostics. Its luminescence decay time of the order of 1 10   μs is thus suitable for the 10 μs time resolution required for the development of scintillator-based SXR plasma diagnostics. A prototype eight channel OSXR array using CsI:Tl was designed, built, and compared to an absolute extreme ultraviolet diode counterpart: its operation on the National Spherical Torus Experiment showed a lower level of induced noise relative to the Si-based diode arrays, especially during neutral beam injection heated plasma discharges. The OSXR concept can also be implemented in less harsh environments for basic spectroscopic laboratory plasma diagnostics.

© 2007 Optical Society of America

OCIS Codes
(040.7480) Detectors : X-rays, soft x-rays, extreme ultraviolet (EUV)
(300.6560) Spectroscopy : Spectroscopy, x-ray
(340.7440) X-ray optics : X-ray imaging
(350.5400) Other areas of optics : Plasmas

ToC Category:
X-ray Optics

History
Original Manuscript: April 4, 2007
Revised Manuscript: June 4, 2007
Manuscript Accepted: June 5, 2007
Published: August 10, 2007

Citation
L. F. Delgado-Aparicio, D. Stutman, K. Tritz, R. Vero, M. Finkenthal, G. Suliman, R. Kaita, R. Majeski, B. Stratton, L. Roquemore, and C. Tarrio, "High-efficiency fast scintillators for "optical" soft x-ray arrays for laboratory plasma diagnostics," Appl. Opt. 46, 6069-6075 (2007)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-46-24-6069

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