Achromatically filtered diamond photoconductive detectors for high power soft x-ray flux measurements
- Lawrence Livermore National Laboratory, Livermore, California 94550 (United States)
A 1-mm-square diamond photoconductive detector (PCD) has been installed on the LLNL Nova laser system, for use as a broadband 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 ({open_quotes}dante{close_quotes}). The time response of the PCD and its bias electronics have been characterized using the 5th harmonic (210 nm) of a short pulse ({lt}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. {copyright} {ital 1999 American Institute of Physics.}
- OSTI ID:
- 295641
- Report Number(s):
- CONF-980605-; ISSN 0034-6748; TRN: 99:001827
- Journal Information:
- Review of Scientific Instruments, Vol. 70, Issue 1; Conference: 12. topical conference on high-temperature plasma diagnostics, Princeton, NJ (United States), 7-11 Jun 1998; Other Information: PBD: Jan 1999
- Country of Publication:
- United States
- Language:
- English
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