Achromatically filtered diamond photoconductive detectors for high power soft x-ray flux measurements | Zendy

R. E. Turner | Zendy; O. L. Landen | Zendy; P. Bell | Zendy; R. Costa | Zendy; D. Hargrove | Zendy

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Achromatically filtered diamond photoconductive detectors for high power soft x-ray flux measurements

Author(s) -

R. E. Turner,

O. L. Landen,

P. Bell,

R. Costa,

D. Hargrove

Publication year - 1999

Publication title -

review of scientific instruments

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.605

H-Index - 165

eISSN - 1089-7623

pISSN - 0034-6748

DOI - 10.1063/1.1149385

Subject(s) - optics , laser , materials science , diamond , optoelectronics , diode , detector , photodiode , bandwidth (computing) , sapphire , broadband , physics , telecommunications , engineering , composite material

A 1 mm square diamond photoconductive detector (PCD) has been installed on the LLNL Nova laser system, for use as a broad band soft x-ray power diagnostic. The PCD is installed behind an array of pinholes, which cast multiple, overlapping images of the source onto the diamond. This allows reduction of the x-ray intensity, to avoid saturation problems, while avoiding the spectral dependency of thin film filters. The diode current is read out on a 5 GHz bandwidth scope. The system is calibrated by comparison to an absolutely calibrated array of filtered vacuum x-ray photodiodes (XRD` s) (``dante``). The time response of the PCD and its bias electronics have been characterized using the 5th harmonic (210 nm) of a short pulse (< 1 ps) Ti:sapphire laser. The data show a fast rise, limited by the 5 GHz scope bandwidth, and a slower fall off, characterized by an RC time of order 200 ps.

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