From single photons to milliwatt radiant power—electron storage rings as radiation sources with a high dynamic range

Klein, R.; Thornagel, R.; Ulm, G.

doi:10.1088/0026-1394/47/5/r02

Cited by 27 publications

(25 citation statements)

References 24 publications

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“…10 The angular acceptance ∆Ω SR is given from the experiment geometry, i.e., a flux defining aperture (AP) placed at a distance d from the source point of the radiation. The spectral radiant intensity of the SR can be adjusted by means of the selected electron beam current over many decades, 21 in order to be in the same range as that of the source under test.…”

Section: Setup Calibration Principlementioning

confidence: 99%

A new facility for the synchrotron radiation-based calibration of transfer radiation sources in the ultraviolet and vacuum ultraviolet spectral range

Thornagel

Fliegauf

Klein

et al. 2015

Review of Scientific Instruments

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The Physikalisch-Technische Bundesanstalt (PTB) has a long tradition in the calibration of radiation sources in the ultraviolet and vacuum ultraviolet spectral range, with traceability to calculable synchrotron radiation. Within this context, new instrumentation in the PTB laboratory at the Metrology Light Source (MLS) has been put into operation that opens up extended and improved calibration possibilities. A new facility for radiation source calibrations has been set up in the spectral range from 7 nm to 400 nm based on a combined normal incidence-grazing incidence monochromator. The facility can be used for the calibration of transfer sources in terms of spectral radiant intensity or mean spectral radiance, with traceability to the MLS primary source standard. We describe the design and performance of the experimental station and give examples of some commissioning results.

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Section: Setup Calibration Principlementioning

confidence: 99%

A new facility for the synchrotron radiation-based calibration of transfer radiation sources in the ultraviolet and vacuum ultraviolet spectral range

Thornagel

Fliegauf

Klein

et al. 2015

Review of Scientific Instruments

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“…For instance, for the metrology light source (MLS), the electron storage ring of the Physikalisch-Technische Bundesanstalt (PTB, Germany), the critical wavelength λ c at 630 MeV energy is equal to 3.4 nm [30]. At this electron energy, the spectral irradiance level in the visible and near infrared spectral ranges can be made comparable with that of a blackbody at 3000 K by adjustment of the electron beam current.…”

Section: Blackbody Versus Synchrotronmentioning

confidence: 99%

Alternative Methods of Blackbody Thermodynamic Temperature Measurement Above Silver Point

Prokhorov¹,

Sapritsky

Khlevnoy

et al. 2015

Int J Thermophys

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Presently, absolute radiometry is the main method of thermodynamic temperature determination above the silver point. The importance of such measurements has increased, as a large international project is underway aimed at assigning thermodynamic temperatures to high-temperature fixed points (HTFPs). All participants are using filter radiometers calibrated against an absolute cryogenic radiometer which, therefore, will be the basis of the provided thermodynamic temperatures of the fixed points. However, such a unified approach may lead to systematic errors (if any) common to all participants. There are methods, providing an alternative to absolute radiometry, which allow the determination of blackbody thermodynamic temperatures using relative measurements. Alternative methods, even if they have lower accuracy than absolute radiometry, could disclose some possible unrecognized systematic errors, or, on the contrary, could confirm the results obtained using absolute radiometry and increase confidence of the thermodynamic temperature determination. One such method, known as the method of ratios (i.e., double wavelength technique), is based on measuring the ratios of fluxes emitted by a blackbody in separate spectral ranges at two temperatures. This approach has been developed at VNIIOFI, but its realization met serious technical difficulties. Modern sensors with improved sensitivity and stability, extremely reproducible HTFP blackbodies, and significant progress in computational methods and computer performance provide a new chance to realize this approach with sufficient accuracy. Another method is based on comparing the ratio of fluxes 123 Int J Thermophys (2015) 36:252-266 253 measured at two wavelengths for a high-temperature blackbody with that measured for synchrotron radiation. This article overviews possibilities of the alternative methods for determination of blackbody thermodynamic temperatures by means of relative radiometry to attract attention of the thermometry and radiometry communities to the importance of international cooperation for realization of these methods.

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“…from one stored electron, which is equivalent to a current of 1 pA, up to the design value of 200 mA. By this, the radiant intensity of the synchrotron radiation can be adjusted accordingly without changing the shape of the spectrum [5]. These possible variations in the spectral shape and intensity of the synchrotron radiation spectrum enable PTB to select tailor-made conditions for various applications.…”

Section: The Mls Storage Ring and Instrumentationmentioning

confidence: 99%

UV and VUV calibration capabilities at the Metrology Light Source for solar and atmospheric research

Klein

Gottwald

Kolbe

et al. 2013

AIP Conference Proceedings

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A synchrotron-radiation-based variable angle ellipsometer for the visible to vacuum ultraviolet spectral range Review of Scientific Instruments 85, 055117 (2014) Abstract. The Physikalisch-Technische Bundesanstalt (PTB), Germany's national metrology institute, is responsible for the realization and dissemination of the legal units in Germany. Within this mission, PTB has been using synchrotron radiation for the realization of the radiometric units in the spectral range from the UV to the X-ray region for more than 25 years. Prominent examples for calibration work using synchrotron radiation performed by PTB within the framework of solar or atmospheric research refer, e.g., to the SUMER and CDS spectrometers of the SOHO mission, the LYRA mission, or the SOL-ACES and the SOLSPEC instruments on ISS.

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From single photons to milliwatt radiant power—electron storage rings as radiation sources with a high dynamic range

Cited by 27 publications

References 24 publications

A new facility for the synchrotron radiation-based calibration of transfer radiation sources in the ultraviolet and vacuum ultraviolet spectral range

A new facility for the synchrotron radiation-based calibration of transfer radiation sources in the ultraviolet and vacuum ultraviolet spectral range

Alternative Methods of Blackbody Thermodynamic Temperature Measurement Above Silver Point

UV and VUV calibration capabilities at the Metrology Light Source for solar and atmospheric research

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