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| Hauptseite > Publikationsdatenbank > What is the scope of fast SANS detectors at ESS ? |
| Hauptseite > Publikationsdatenbank > What is the scope of fast SANS detectors at ESS ? |
| Conference Presentation (Invited) | FZJ-2017-00266 |
2016
Abstract: The requirements of SANS instruments at the new high-flux source ESS are discussed in context with detectors. Since instrument fluxes are one order of magnitude (or more) higher than at conventional reactors, new detector concepts are essential. There, the new SoNDe concept ideally fills in the gap.We will see that for most of the SANS measurements SoNDe will ideally deal with the high intensities of SKADI. The envisaged 20MHz count rate on 1m2 detector will serve most of the experiments well. For instance single-shot kinetic experiment need to deal with high intensities, since the statistics must be collected in a single run.Apart from the classical SANS requirements, we will discuss options for high resolution. Liquid crystalline order demands for high resolution in the classical SANS range, where neighbored Bragg peaks need to be distingushed, where the peak width will characterize the correlation length, and where the peak width as a function of peak order will tell about the kind of order (whether a paracrystal is obtained). At smaller angles in the VSANS range, best resolution is required to obtain smallest possible scattering angles with adequate resolution. Both techniques would benefit from an interpolation algorithm that could drive the resolution higher by factors of 3 to 5 or even 10. Here, the Anger camera principle would fill in the gap.While the classical SANS experiments require highest count rates with well separated dead times for each pixel that is usually obtained by optically separating the light conduction for each pixel, the high resolution Anger camera would need to spread light cones over several pixels. While in the first case grooves in the scintillation material would separate the light conduction, they are not allowed in the second case. This dilemma needs to be discussed and solved, where the emphasis lies on the classical SANS applications, and eventually high resolution options need to be seen as wishes for the future.
Keyword(s): Polymers, Soft Nano Particles and Proteins (1st) ; Engineering, Industrial Materials and Processing (1st) ; Soft Condensed Matter (2nd) ; Materials Science (2nd)
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