Difference between revisions of "Resolutions"
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Revision as of 13:46, 10 July 2009
Prelude
- Two gases are used: 70/30 and 90/10 Ar/CO2
- Two fADC clock settings are used: 125 and 200 MHz
- Drift time spectra (DCOG method is used):
- Red line is fit to get absolute minimal drift time
- Best tracking results if extracted minimal drift time + 1 time sample
- Samples per rising edge - 2 extra samples 125 -> 200 MHz
- Time-2-distance relation:
- GARFIELD is used. To get best resolutions out of it:
- 68/32 Ar/CO2 is put in GARFIELD for 70/30 gas
- 89/11 Ar/CO2 is put in GARFIELD for 90/10 gas
- +-6% CO2 can give 100~ns difference
- GARFIELD is used. To get best resolutions out of it:
Resolutions
- Difference in gases - blue line is a model prediction:
- 90/10 worse because shorter drift times.
- Model contains:
- Timing resolution
- accuracy
- diffusion
| Distance from wire [mm] | Resolution (low) [um] | Resolution (high [um] | ||
|---|---|---|---|---|
| 125 MHz | 200 MHz | 125 MHz | 200 MHz | |
