Difference between revisions of "CDC recent run drift times"
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Fitted drift time function to straws in run 2451, picked straws with tmax slope < 30, used same straws for subsequent runs. | Fitted drift time function to straws in run 2451, picked straws with tmax slope < 30, used same straws for subsequent runs. | ||
| − | Used same hit thresholds & window for all runs. | + | Used same hit thresholds & window for all runs. </br> |
| + | The drift times are for a small group of straws, the amplitude & pedestal histograms are for ALL straws. In the earlier runs the amplitude histograms are cut off at the lower end by the sparsification threshold so I would not pay too much attention to these. I will look to see if there are any straws with a low enough threshold that the amplitude MPV is visible. | ||
Revision as of 10:51, 27 March 2015
Fitted drift time function to straws in run 2451, picked straws with tmax slope < 30, used same straws for subsequent runs. Used same hit thresholds & window for all runs. </br> The drift times are for a small group of straws, the amplitude & pedestal histograms are for ALL straws. In the earlier runs the amplitude histograms are cut off at the lower end by the sparsification threshold so I would not pay too much attention to these. I will look to see if there are any straws with a low enough threshold that the amplitude MPV is visible.
Contents
Run 2451
7 Feb 2015. First run of 2015. Increased sparsification thresholds from 7sigma to 18sigma
Garfield 5475-4525 Ar-CO2 has tmax ~560ns
Run 2551
2-3 March 2015. 3 weeks after disengaging the alcohol bubbler.
Run 2560
8 March 2015. 5 days after changing the CO2 gas factor from 0.773 to 0.74
Run 2577
10 March 2015. 1 day after changing the gas mixer MFCs from master/slave to independent
Run 2616
11 March 2015. 2 days after changing the gas mixer MFCs from master/slave to independent
Run 2617
11 March
Garfield 5200-4800 Ar-CO2 has tmax ~ 595ns
Run 2619
12 March
Run 2642
14 March. After moving CO2 controller from ch2 to ch4 (on March 13) and decreasing sparsification thresholds
Run 2644
16 March.
Run 2649
17 March. 10 hours after returning CO2 controller from ch4 to ch2
Run 2676
22 March.
