Reduced absolute uncertainty in the irradiance of SURF-II and instrumentation for measuring linearity of X-ray, XUV and UV detectors

Hughey, L. R.; Schaefer, A. R.

doi:10.1016/0029-554x(82)90801-1

Cited by 14 publications

(6 citation statements)

References 7 publications

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“…A second method depends onmeasuring the radiation from a very small number of electrons and deducing the radiant intensity per electron. Scaling this up to normal operating currents relies on the linearity of silicon detectors [ 62 ]. With the combinationof these methods SURF III’s radiant intensity can be predicted to within a relative uncertainty of 0.2 % to 0.5 %, depending upon wavelength and operating conditions.…”

Section: Spectral Sources and Pyrometrymentioning

confidence: 99%

The candela and photometric and radiometric measurements

Parr¹

2001

J. Res. Natl. Inst. Stand. Technol.

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The national measurement system for photometric and radiometric quantities is presently based upon techniques that make these quantities traceable to a high-accuracy cryogenic radiometer. The redefinition of the candela in 1979 provided the opportunity for national measurement laboratories to base their photometric measurements on optical detector technology rather than on the emission from high-temperature blackbody optical sources. The ensuing technical developments of the past 20 years, including the significant improvements in cryogenic radiometer performance, have provided the opportunity to place the fundamental maintenance of photometric quantities upon absolute detector based technology as was allowed by the 1979 redefinition. Additionally, the development of improved photodetectors has had a significant impact on the methodology in most of the radiometric measurement areas. This paper will review the status of the NIST implementation of the technical changes mandated by the 1979 redefinition of the candela and its effect upon the maintenance and dissemination of optical radiation measurements.

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Section: Spectral Sources and Pyrometrymentioning

confidence: 99%

The candela and photometric and radiometric measurements

Parr¹

2001

J. Res. Natl. Inst. Stand. Technol.

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“…The electron-beam current is determined through an electron counting procedure [8][9][10] because direct electrical measurements are difficult to perform. When less than a few thousand electrons 1 are left orbiting in SURF, the decrease in synchrotron radiation tied to the loss of individual electrons can be observed.…”

Section: Electron-beam Currentmentioning

confidence: 99%

SURF III - an improved storage ring for radiometry

Arp¹,

Friedman²,

Furst³

et al. 2000

Metrologia

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The National Institute of Standards and Technology (NIST) operates the newly upgraded Synchrotron Ultraviolet Radiation Facility (SURF III) mainly as a light source for radiometry. SURF III provides continuum radiation from the far-infrared to the soft X-ray spectral range and has its peak output in the extreme ultraviolet. SURF III is a circular-orbit, weak-focusing (single dipole magnet) storage ring, a feature which is advantageous if the synchrotron radiation output is calculated. We report the improvements achieved during a recent upgrade from SURF II to SURF III and our strategy to accurately determine the magnetic¯ux density, radio frequency (RF), beam current, and beam size, which are the parameters necessary to characterize the source completely.

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“…(A), and the angular asymmetry parameter 8j(A). The equation has the following form: The quantity K is a proportionally constant related to ths geometry of the interaction region and the gas 19 and larger molecules such as SF 6 20 have been studied.…”

Section: ) On El-3 and A High Thrcughtput Monochromator (2mnim Inmentioning

confidence: 99%

An Overview of Research at NBS Using Synchrotron Radiation at SURF-II

Ederer

Madden

Parr

et al. 1983

IEEE Trans. Nucl. Sci.

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M it. The National Bureau of Standards (NBS) Synchrotron Ultraviolet Radiation Facility (SUP.F-II) is used in conjunction with several high throughput nonochron;ators to study the interaction of vacuum ultraviolet photons with solids and gases. Recent work has been concerned with the photon stimulated desorption of atomic and molecular ions from surfaces, with the effect of electric fields on molecular photoabsorption and with the study of molecular photcionization by angle resolved photoelectron spectroscopy. These research programs yield new information about molecular bonding at surfaces, molecular dynamics near ionization thresholds, and the coupling of the electronic and nuclear motion near resonances in molecules. In addition to these programs in basic research SliRF-II is used for the calibration of transfer standard detectors over a photon energy range 20-250 eV. Calibration of monochromator systems is achieved over the photon energy range 5-250 eV by using the now calculable spectral intensity radiated by the electrons, which are confined in a nearly circular orbit. 14.0 14.5 Binding Energy 15.0

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Reduced absolute uncertainty in the irradiance of SURF-II and instrumentation for measuring linearity of X-ray, XUV and UV detectors

Cited by 14 publications

References 7 publications

The candela and photometric and radiometric measurements

The candela and photometric and radiometric measurements

SURF III - an improved storage ring for radiometry

An Overview of Research at NBS Using Synchrotron Radiation at SURF-II

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