ARCS resolution

DGS Resolution tool

The recommended way to examine different resolution conditions for a direct geometry instrument is to use the tool at

This is a small web application, which provides the experimental and modeling result for resolution (FWHM) values, and should be useful for experiment-planning and quick data analysis.

The website should be pretty straightforward to navigate, but here are some quick explanations:

  • First choose the ARCS instrument
  • Click “Help” under the page banner will show some information about the data and modeling

    Help section Figure 1. Expand the help section

  • For each instrument there are two tabs. One for inelastic energy resolution plots, one for elastic resolution plots.

    Inelastic/elastic tabs Figure 2. Inelastic and elastic tabs.

  • In the inelastic tab, there is a form to choose incident energy and some (chopper) settings. Click the “Calculate” button will calculate the FWHM vs E curve using those settings

    Instrument configuration Figure 3. Instrument configuration.

  • Below the configuration, there are several tabs. In the “Summary” tab some basic info of the configuration and resolution is given

    Summary Figure 4. Summary.

  • In the “Plot” tab a curve of FWHM vs E is plotted.

    Plot Figure 5. FWHM(E).

  • Still in the “Plot” tab, above the resolution-vs-energy plot, click “Polynomial fit …” will show results for fitting the FWHM(E) to a polynomial.

    Plot Figure 6. Polynimal fit for FWHM vs E.

  • Click the download button below the resolution-vs-energy plot will download a csv file

  • The elastic tab shows some plots about the elastic resolution/flux information.

Old ARCS resolution page

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