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Theory and simulati...
Theory and simulations of covariance mapping in multiple dimensions for data analysis in high-event-rate experiments
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- Zhaunerchyk, Vitali (författare)
- Uppsala universitet,Gothenburg University,Göteborgs universitet,Institutionen för fysik (GU),Department of Physics (GU),Molekyl- och kondenserade materiens fysik
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Frasinski, L. J. (författare)
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- Eland, John H. D., 1941 (författare)
- Uppsala universitet,Molekyl- och kondenserade materiens fysik
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- Feifel, Raimund (författare)
- Uppsala universitet,Gothenburg University,Göteborgs universitet,Institutionen för fysik (GU),Department of Physics (GU),Molekyl- och kondenserade materiens fysik
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(creator_code:org_t)
- 2014
- 2014
- Engelska.
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Ingår i: Physical Review A. - 1050-2947 .- 1094-1622. ; 89:5
- Relaterad länk:
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Abstract
Ämnesord
Stäng
- Multidimensional covariance analysis and its validity for correlation of processes leading to multiple products are investigated from a theoretical point of view. The need to correct for false correlations induced by experimental parameters which fluctuate from shot to shot, such as the intensity of self-amplified spontaneous emission x-ray free-electron laser pulses, is emphasized. Threefold covariance analysis based on simple extension of the two-variable formulation is shown to be valid for variables exhibiting Poisson statistics. In this case, false correlations arising from fluctuations in an unstable experimental parameter that scale linearly with signals can be eliminated by threefold partial covariance analysis, as defined here. Fourfold covariance based on the same simple extension is found to be invalid in general. Where fluctuations in an unstable parameter induce nonlinear signal variations, a technique of contingent covariance analysis is proposed here to suppress false correlations. In this paper we also show a method to eliminate false correlations associated with fluctuations of several unstable experimental parameters.
Ämnesord
- NATURVETENSKAP -- Fysik -- Atom- och molekylfysik och optik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Atom and Molecular Physics and Optics (hsv//eng)
Nyckelord
- DOUBLE-IONIZATION
- COINCIDENCE
- PHOTOELECTRON
- SPECTOSCOPY
- REMOVAL
- ATOMS
- LASER
- ION
- Optics
- Physics
- Atomic
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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