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A systematic study of rate capability in MWPCs (final analysis)

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.

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A systematic study of rate capability in MWPCs (final analysis)

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  1. A systematic study of rate capability in MWPCs(final analysis) D. Gonzalez-Diaz 16-10-2008

  2. Set-up

  3. Gain measurements (I)

  4. Gain measurements (II)

  5. The Mathieson model (I)

  6. The Mathieson model (II) Blanc's Law: Rate capability at fractional gain drop F:

  7. Typical rate curves

  8. Correction for beam-size dependence (I)

  9. Correction for beam-size dependence (II)

  10. Correction for beam-size dependence (III)

  11. Comparison with theoretical curves

  12. Global fit to all curves: 6 (3mixtures x 2 pitches) parameters

  13. Comparison with measured mobilities

  14. Extrapolation to mips

  15. Comparison with data from mips

  16. 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).

  17. Appendix

  18. Dead time correction

  19. Beam-size dependence

  20. All in a nut-shell

  21. rate capability extrapolation

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