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Production of high-energy photons from flash x-ray sources powered by stacked Blumlein generators (1990)

Coogan, J. J. ; Davanloo, F. ; Collins, C. B.

[S.l.] : American Institute of Physics (AIP)

Review of Scientific Instruments 61 (1990), S. 1448-1456

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ISSN: 1089-7623

Quelle: AIP Digital Archive

Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik

Notizen: Described here is the design and construction of a pulse-power generator capable of discharging at high repetition rates. It consists of eight triaxial Blumleins stacked in series at one end. These lines are charged in parallel and synchronously commuted with a single thyratron at the other end to produce an open circuit voltage across a stack of six times the charging voltage. An x-ray diode has been constructed and matched to this pulse-power source making possible the emission of an average bremsstrahlung exposure rate of 17 R/S from a sequence of 40-ns pulses. When operated at 60-kV charging voltage, direct spectral measurements show the output to be a true continuum, peaking at intensities in excess of 5×108 photons/keV/shot and containing useful intensities of photons having energies of 300 keV.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.1141150

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Digitale Medien

Amorphic diamond films produced by a laser plasma source (1990)

Davanloo, F. ; Juengerman, E. M. ; Jander, D. R. ; [weitere]

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 67 (1990), S. 2081-2087

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ISSN: 1089-7550

Quelle: AIP Digital Archive

Thema: Physik

Notizen: Recently, attention has been focused upon laser plasma sources of thin-film diamond. These depend upon laser-ignited discharges in which intense pulsed currents flow through the small volume of carbon plasma ablated from graphite feedstock by a focused laser beam. The materials produced in this way generally resemble the hard amorphic films deposited by ion beams. This paper reports a detailed characterization of these films which we call amorphic diamond. The combination of an optical band gap of 1.0 eV with a grain size of 100–200 A(ring) places this material far outside the range of possibilities available to the model of graphitic islands. A structure of very fine grained diamond would more readily explain the hardness of 13 GPa determined in the absence of any measurable fraction of hydrogen. Such amorphic diamond films have been grown uniformly on 100-cm2 areas at ambient room temperatures with no seeding or abrasion of the substrate.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.345566

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