Difference between revisions of "Resolutions"
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* 90/10 worse because shorter drift times. | * 90/10 worse because shorter drift times. | ||
* Model contains: | * Model contains: | ||
− | ** Timing resolution | + | ** Timing resolution (0.75 length of time sample) |
− | ** accuracy | + | ** accuracy |
− | ** diffusion | + | ** diffusion (Garfield) |
+ | |||
+ | * Table with resolutions for straw 7 and different clock settings: | ||
+ | ** high: with hit removed from tracking | ||
+ | ** low: with hit included | ||
{| border="1" | {| border="1" | ||
− | |||
|- | |- | ||
| Distance from wire [mm] | | Distance from wire [mm] | ||
− | + | !colspan="2"| Resolution (low) [um] | |
− | + | !colspan="2"| Resolution (high [um] | |
|- | |- | ||
| | | | ||
Line 56: | Line 59: | ||
| 125 MHz | | 125 MHz | ||
| 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 | ||
|} | |} | ||
− | {| border="1" cellpadding=" | + | * The difference between high and low is largest for 1-3 mm driftdistances but overall the difference is not that big. |
+ | * Gas mixture has a big impact | ||
+ | * We might not have a big enough lever arm: | ||
+ | {| border="1" cellpadding="2" | ||
|- | |- | ||
− | | | + | |width="415pt"|[[Image:endplate.jpg|thumb|none|400px|Drawing of the end plate of the small prototype.]] |
|- | |- | ||
− | | | + | |} |
− | | | + | |
+ | |||
+ | = GARFIELD - DATA = | ||
+ | |||
+ | Below 70/30 gas mixture ch 7: left MC, right data | ||
+ | |||
+ | {| border="1" cellpadding="2" | ||
|- | |- | ||
− | | | + | |width="415pt"|[[Image:res7mc.jpg|thumb|none|400px|Resolutions as a function of drift distance (MC).]] |
− | | | + | |width="415pt"|[[Image:res7data.jpg|thumb|none|400px|Resolutions as a function of drift distance (data).]] |
|- | |- | ||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
|} | |} | ||
+ | |||
+ | = To do = | ||
+ | |||
+ | * There is a full simulation of the chamber and results are on there way | ||
+ | * We are testing 80/20 gas right now | ||
+ | * We want to test the same gas mixture as FDC uses | ||
+ | * We also want to try and add ethane | ||
+ | * Try different timing algorithms | ||
+ | * Find a way to extract the timing resolution directly |
Latest revision as of 15:55, 23 July 2009
Contents
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 (0.75 length of time sample)
- accuracy
- diffusion (Garfield)
- Table with resolutions for straw 7 and different clock settings:
- high: with hit removed from tracking
- low: with hit included
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 |
- The difference between high and low is largest for 1-3 mm driftdistances but overall the difference is not that big.
- Gas mixture has a big impact
- We might not have a big enough lever arm:
GARFIELD - DATA
Below 70/30 gas mixture ch 7: left MC, right data
To do
- There is a full simulation of the chamber and results are on there way
- We are testing 80/20 gas right now
- We want to test the same gas mixture as FDC uses
- We also want to try and add ethane
- Try different timing algorithms
- Find a way to extract the timing resolution directly