a systematic study of rate capability in mwpcs (final analysis)
DESCRIPTION
A systematic study of rate capability in MWPCs (final analysis). D. Gonzalez-Diaz 16-10-2008. Set-up. Gain measurements (I). Gain measurements (II). The Mathieson model (I). The Mathieson model (II). Blanc's Law:. Rate capability at fractional gain drop F:. Typical rate curves. - PowerPoint PPT PresentationTRANSCRIPT
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A systematic study of rate capability in MWPCs
(final analysis)
D. Gonzalez-Diaz
16-10-2008
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Set-up
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Gain measurements (I)
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Gain measurements (II)
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The Mathieson model (I)
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The Mathieson model (II)
Blanc's Law:
Rate capability at fractional gain drop F:
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Typical rate curves
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Correction for beam-size dependence (I)
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Correction for beam-size dependence (II)
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Correction for beam-size dependence (III)
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Comparison with theoretical curves
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Global fit to all curves: 6 (3mixtures x 2 pitches) parameters
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Comparison with measured mobilities
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Extrapolation to mips
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Comparison with data from mips
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Conclusions
Once one corrects for beam-size effects and if the nature of the drifting ion is known, the Mathieson formula has an enormous predictive power.
There is room for a further increase of pion suppresion without sacrifying the rate capability (increasing the gap h).
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Appendix
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Dead time correction
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Beam-size dependence
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All in a nut-shell
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rate capability extrapolation