Difference between revisions of "Resolutions"
From GlueXWiki
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| Distance from wire [mm] | | Distance from wire [mm] | ||
− | colspan="2"| Resolution (low) [um] | + | !colspan="2"| Resolution (low) [um] |
− | colspan="2"| Resolution (high [um] | + | !colspan="2"| Resolution (high [um] |
|- | |- | ||
| | | | ||
Line 56: | Line 56: | ||
| 200 MHz | | 200 MHz | ||
|- | |- | ||
+ | | 0-1 | ||
+ | | 388 | ||
+ | | 394 | ||
+ | | 404 | ||
+ | | 396 | ||
+ | |- | ||
+ | | 1-2 | ||
+ | | 346 | ||
+ | | 292 | ||
+ | | 346 | ||
+ | | 205 | ||
+ | |- | ||
+ | | 2-3 | ||
+ | | 209 | ||
+ | | 191 | ||
+ | | 222 | ||
+ | | 210 | ||
+ | |- | ||
+ | | 3-4 | ||
+ | | 142 | ||
+ | | 135 | ||
+ | | 166 | ||
+ | | 165 | ||
+ | |- | ||
+ | | 4-5 | ||
+ | | 118 | ||
+ | | 96 | ||
+ | | 164 | ||
+ | | 151 | ||
+ | |- | ||
+ | | 5-6 | ||
+ | | 85 | ||
+ | | 88 | ||
+ | | 148 | ||
+ | | 164 | ||
+ | |- | ||
+ | | 6-7 | ||
+ | | 67 | ||
+ | | 70 | ||
+ | | 165 | ||
+ | | 174 | ||
+ | |- | ||
+ | | 7-8 | ||
+ | | 65 | ||
+ | | 63 | ||
+ | | 158 | ||
+ | | 169 | ||
|} | |} |
Revision as of 13:50, 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 | |
0-1 | 388 | 394 | 404 | 396 |
1-2 | 346 | 292 | 346 | 205 |
2-3 | 209 | 191 | 222 | 210 |
3-4 | 142 | 135 | 166 | 165 |
4-5 | 118 | 96 | 164 | 151 |
5-6 | 85 | 88 | 148 | 164 |
6-7 | 67 | 70 | 165 | 174 |
7-8 | 65 | 63 | 158 | 169 |