skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Advanced STJ-based X-Ray Spectrometer for Synchrotron Science Applications

  1. STAR Cryoelectronics, Santa Fe, NM (United States)
Publication Date:
Research Org.:
STAR Cryoelectronics, Santa Fe, NM (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
Report Number(s):
DOE Contract Number:
Type / Phase:
Resource Type:
Technical Report
Country of Publication:
United States
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; X-ray detector; superconducting tunnel junction; STJ; X-ray absorption spectroscopy; XAS

Citation Formats

Cantor, Robin. Advanced STJ-based X-Ray Spectrometer for Synchrotron Science Applications. United States: N. p., 2017. Web.
Cantor, Robin. Advanced STJ-based X-Ray Spectrometer for Synchrotron Science Applications. United States.
Cantor, Robin. 2017. "Advanced STJ-based X-Ray Spectrometer for Synchrotron Science Applications". United States. doi:.
title = {Advanced STJ-based X-Ray Spectrometer for Synchrotron Science Applications},
author = {Cantor, Robin},
abstractNote = {},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 2017,
month = 8

Technical Report:
This technical report may be protected. To request the document, click here.
Other availability
Please see Document Availability for additional information on obtaining the full-text document. Library patrons may search WorldCat to identify libraries that may hold this item. Keep in mind that many technical reports are not cataloged in WorldCat.

Save / Share:
  • In this project, developed scheduling frameworks for dynamic bandwidth demands for large-scale science applications. In particular, we developed scheduling algorithms for dynamic bandwidth demands in this project. Apart from theoretical approaches such as Integer Linear Programming, Tabu Search and Genetic Algorithm heuristics, we have utilized practical data from ESnet OSCARS project (from our DOE lab partners) to conduct realistic simulations of our approaches. We have disseminated our work through conference paper presentations and journal papers and a book chapter. In this project we addressed the problem of scheduling of lightpaths over optical wavelength division multiplexed (WDM) networks. We published severalmore » conference papers and journal papers on this topic. We also addressed the problems of joint allocation of computing, storage and networking resources in Grid/Cloud networks and proposed energy-efficient mechanisms for operatin optical WDM networks.« less
  • Despite recent intensive experimental effort, the electronic structure of Pu, particularly {delta}-Pu, remains ill defined. An evaluation of our previous synchrotron-radiation-based investigation of {alpha}-Pu and {delta}-Pu has lead to a new paradigm for the interpretation of photoemission spectra of U, Np, {alpha}-Pu, {delta}-Pu and Am. This approach is founded upon a model in which spin and spin-orbit splittings are included in the picture of the 5f states and upon the observation of chiral/spin-dependent effects in non-magnetic systems. By extending a quantitative model developed for the interpretation of core level spectroscopy in magnetic systems, it is possible to predict the contributionsmore » of the individual component states within the 5-f manifold. This has lead to a remarkable agreement between the results of the model and the previously collected spectra of U, Np, Pu and Am, particularly {delta}-Pu, and to a prediction of what we might expect to see in future spin-resolving experiments.« less
  • A fiber-optic spectrometer for measurement in the short wavelength near-infrared (SW-NIR) region (700-1100 nm) is presented. Slightly larger than a briefcase and weighing 23 lbs., the instrument is controlled by a 12 MHz laptop computer. The optical scheme uses a concave holographic grating for wavelength dispersion, and a thermoelectrically temperature-stabilized 1024-element silicon photodiode array for detection. A computer-controlled 5.5 watt tungsten lamp, with optical feedback, is the light source. The spectral signal is digitized at a data rate of 22 Khz to 16 bits resolution. Sample measurements are made in either transmission or transflectance mode, using fiber-optic bundles as lightmore » pipes. The spectrometer has a resolution of 3 nm, stray light intensity level of 0.05%, baseline noise level of 25.5 micro-absorbance units, and dynamic range of 3 orders of magnitude. The spectrometer performance is evaluated in 2 application studies. First, NIR spectroscopy is developed as a rapid method for simultaneous estimation of the freezing point and volume percentages of aromatics and saturates in JP-4 jet aviation fuel. Both multiple linear regression and partial least squares analysis methods are used to predict these physical parameters, NIR spectral analysis predictions are within published ASTM reproducibility criteria. Second, quantitative analysis of xylene mixtures is presented. Classical least squares, multiple linear regression and partial least squares analysis techniques are used to predict the volume percent of ortho-, meta-, and para-xylene in a series of xylene mixtures.« less