The Experts below are selected from a list of 49395 Experts worldwide ranked by ideXlab platform
W Biel - One of the best experts on this subject based on the ideXlab platform.
-
high efficiency extreme ultraviolet overview spectrometer construction and laboratory testing
Review of Scientific Instruments, 2006Co-Authors: W Biel, R Burhenn, E Jourdain, A Greiche, D LepereAbstract:The new high efficiency extreme ultraviolet overview spectrometer system (HEXOS) has been developed to study impurity concentrations and impurity transport properties in the plasma of the stellarator W7-X. The HEXOS system consists of four different grating based Spectrometers, which provide large etendue and good spectral resolution over a broad wavelength range (2.5–160nm, divided into four subsections with some overlapping). The mechanical arrangement as two double Spectrometers allows for a compact installation geometry on W7-X. Laboratory testing and wavelength and intensity calibrations have been performed using a dc hollow cathode discharge (24–150nm) and a pinch discharge (2.5–30nm).
-
design of a high efficiency extreme ultraviolet overview spectrometer system for plasma impurity studies on the stellarator experiment wendelstein 7 x
Review of Scientific Instruments, 2004Co-Authors: W Biel, G Bertschinger, R Burhenn, R Konig, E JourdainAbstract:The design for a set of four high-efficiency vacuum ultraviolet/extreme ultraviolet (VUV/XUV) Spectrometers has been developed, which shall be used for plasma impurity monitoring and impurity transport studies on the stellarator experiment Wendelstein 7-X (W7-X). The new high-efficiency XUV overview spectrometer (HEXOS) system covers the wavelength range from 2.5 to 160 nm, divided into four subsections with some overlapping, thus achieving a complete coverage of prominent spectral lines from the relevant impurity elements. Taking into account spectrometer geometries and detector geometries, toroidal holographic diffraction gratings are numerically optimized to maximize the total throughput while maintaining good spectral resolution. The performance of the Spectrometers is tested and optimized by means of ray tracing calculations. In order to prove the potential for line identification as well as the expected levels of signal intensity and noise figures of the new systems, spectra are simulated using the ...
E Jourdain - One of the best experts on this subject based on the ideXlab platform.
-
high efficiency extreme ultraviolet overview spectrometer construction and laboratory testing
Review of Scientific Instruments, 2006Co-Authors: W Biel, R Burhenn, E Jourdain, A Greiche, D LepereAbstract:The new high efficiency extreme ultraviolet overview spectrometer system (HEXOS) has been developed to study impurity concentrations and impurity transport properties in the plasma of the stellarator W7-X. The HEXOS system consists of four different grating based Spectrometers, which provide large etendue and good spectral resolution over a broad wavelength range (2.5–160nm, divided into four subsections with some overlapping). The mechanical arrangement as two double Spectrometers allows for a compact installation geometry on W7-X. Laboratory testing and wavelength and intensity calibrations have been performed using a dc hollow cathode discharge (24–150nm) and a pinch discharge (2.5–30nm).
-
design of a high efficiency extreme ultraviolet overview spectrometer system for plasma impurity studies on the stellarator experiment wendelstein 7 x
Review of Scientific Instruments, 2004Co-Authors: W Biel, G Bertschinger, R Burhenn, R Konig, E JourdainAbstract:The design for a set of four high-efficiency vacuum ultraviolet/extreme ultraviolet (VUV/XUV) Spectrometers has been developed, which shall be used for plasma impurity monitoring and impurity transport studies on the stellarator experiment Wendelstein 7-X (W7-X). The new high-efficiency XUV overview spectrometer (HEXOS) system covers the wavelength range from 2.5 to 160 nm, divided into four subsections with some overlapping, thus achieving a complete coverage of prominent spectral lines from the relevant impurity elements. Taking into account spectrometer geometries and detector geometries, toroidal holographic diffraction gratings are numerically optimized to maximize the total throughput while maintaining good spectral resolution. The performance of the Spectrometers is tested and optimized by means of ray tracing calculations. In order to prove the potential for line identification as well as the expected levels of signal intensity and noise figures of the new systems, spectra are simulated using the ...
Patrick Miller - One of the best experts on this subject based on the ideXlab platform.
-
development of a new compact high resolution sector inductively coupled plasma mass spectrometer
Journal of Analytical Atomic Spectrometry, 1998Co-Authors: Philip J Marriott, Roger Fletcher, Alistair Cole, Ian Beaumont, James Lofthouse, Steven Bloomfield, Patrick MillerAbstract:There is an infinite set of geometries which will form a double focusing mass spectrometer. The design process which is used to determine a suitable geometry for the application has often been strongly influenced by the mass range required of the instrument. The types of geometry an organic spectrometer has are largely a result of this, and a brief overview of the design process for this type of application is described in this paper. A spectrometer for elemental use has less of a constraint from the mass range and can follow a different design path. A set of design criteria for an elemental spectrometer is discussed, and an overview is given of how these different objectives are achieved in the latest generation of sector mass Spectrometers for elemental ICP-MS.
Denis J Phares - One of the best experts on this subject based on the ideXlab platform.
-
a comparison of particle mass Spectrometers during the 1999 atlanta supersite project
Journal of Geophysical Research, 2003Co-Authors: Ann M. Middlebrook, Ryan J Wenzel, Denis J Phares, Kimberly A Prather, D M Murphy, D.s. ThomsonAbstract:During the Atlanta Supersite Project, four particle mass Spectrometers were operated together for the first time: NOAA's Particle Analysis by Laser Mass Spectrometer (PALMS), University of California at Riverside's Aerosol Time-of-Flight Mass Spectrometer (ATOFMS), University of Delaware's Rapid Single-Particle Mass Spectrometer II (RSMS-II), and Aerodyne's Aerosol Mass Spectrometer (AMS). Although these mass Spectrometers are generally classified as similar instruments, they clearly have different characteristics due to their unique designs. One primary difference is related to the volatilization/ionization method: PALMS, ATOFMS, and RSMS-II utilize laser desorption/ionization, whereas particles in the AMS instrument are volatilized by impaction onto a heated surface with the resulting components ionized by electron impact. Thus mass spectral data from the AMS are representative of the ensemble of particles sampled, and those from the laser-based instruments are representative of individual particles. In addition, the AMS instrument cannot analyze refractory material such as soot, sodium chloride, and crustal elements, and some sulfate or water-rich particles may not always be analyzed with every laser-based instrument. A main difference among the laser-based mass Spectrometers is that the RSMS-II instrument can obtain size-resolved single particle composition information for particles with aerodynamic diameters as small as 15 nm. The minimum sizes analyzed by ATOFMS and PALMS are 0.2 and about 0.35 μm, respectively, in aerodynamic diameter. Furthermore, PALMS, ATOFMS, and RSMS-II use different laser ionization conditions. Despite these differences the laser-based instruments found similar individual particle classifications, and their relative fractions among comparable sized particles from Atlanta were broadly consistent. Finally, the AMS measurements of the nitrate/sulfate mole ratio were highly correlated with composite measurements (r^2 = 0.93). In contrast, the PALMS nitrate/sulfate ion ratios were only moderately correlated (r^2 ∼ 0.7).
D Lepere - One of the best experts on this subject based on the ideXlab platform.
-
high efficiency extreme ultraviolet overview spectrometer construction and laboratory testing
Review of Scientific Instruments, 2006Co-Authors: W Biel, R Burhenn, E Jourdain, A Greiche, D LepereAbstract:The new high efficiency extreme ultraviolet overview spectrometer system (HEXOS) has been developed to study impurity concentrations and impurity transport properties in the plasma of the stellarator W7-X. The HEXOS system consists of four different grating based Spectrometers, which provide large etendue and good spectral resolution over a broad wavelength range (2.5–160nm, divided into four subsections with some overlapping). The mechanical arrangement as two double Spectrometers allows for a compact installation geometry on W7-X. Laboratory testing and wavelength and intensity calibrations have been performed using a dc hollow cathode discharge (24–150nm) and a pinch discharge (2.5–30nm).
