A systematic study of rate capability in MWPCs (final analysis)
description
Transcript of 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
Correction for beam-size dependence (I)
Correction for beam-size dependence (II)
Correction for beam-size dependence (III)
Comparison with theoretical curves
Global fit to all curves: 6 (3mixtures x 2 pitches) parameters
Comparison with measured mobilities
Extrapolation to mips
Comparison with data from mips
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).
Appendix
Dead time correction
Beam-size dependence
All in a nut-shell
rate capability extrapolation