Recovery of CVD Diamond Detectors using Laser Double Pulses

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A 5 x 0.25 mm Chemical Vapor Deposited (CVD) diamond detector, with a voltage bias of + 250V, was excited by a 400 nm laser (3.1 eV photons) in order to study the saturation of the wafer and its associated electronics. In a first experiment, the laser beam energy was increased from a few tens of a pJ to about 100 {micro}J, and the signal from the diamond was recorded until full saturation of the detection system was achieved. Clear saturation of the detection system was observed at about 40 V, which corresponds with the expected saturation at 10% of ... continued below

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Dauffy, L S; Lerche, R A; Schmid, G J; Koch, J A & Silbenagel, C September 27, 2005.

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A 5 x 0.25 mm Chemical Vapor Deposited (CVD) diamond detector, with a voltage bias of + 250V, was excited by a 400 nm laser (3.1 eV photons) in order to study the saturation of the wafer and its associated electronics. In a first experiment, the laser beam energy was increased from a few tens of a pJ to about 100 {micro}J, and the signal from the diamond was recorded until full saturation of the detection system was achieved. Clear saturation of the detection system was observed at about 40 V, which corresponds with the expected saturation at 10% of the applied bias (250V). The results indicate that the interaction mechanism of the 3.1 eV photons in the diamond (E{sub bandgap} = 5.45 eV) is not a multi-photon process but is linked to the impurities and defects of the crystal. In a second experiment, the detector was irradiated by a saturating first laser pulse and then by a delayed laser pulse of equal or smaller amplitude with delays of 5, 10, and 20 ns. The results suggest that the diamond and associated electronics recover within 10 to 20 ns after a strong saturating pulse.

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PDF-file: 5 pages; size: 81.4 Kbytes

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  • Presented at: 4th International Fusion Sciences & Applications, Biarritz, France, Sep 04 - Sep 09, 2005

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  • Report No.: UCRL-PROC-216119
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 883548
  • Archival Resource Key: ark:/67531/metadc891992

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • September 27, 2005

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  • Sept. 23, 2016, 2:42 p.m.

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  • Dec. 8, 2016, 9:10 p.m.

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Dauffy, L S; Lerche, R A; Schmid, G J; Koch, J A & Silbenagel, C. Recovery of CVD Diamond Detectors using Laser Double Pulses, article, September 27, 2005; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc891992/: accessed October 19, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.