Difference between revisions of "CDC recent run drift times"
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<h2>Run 2560 - solenoid off</h2> | <h2>Run 2560 - solenoid off</h2> | ||
| − | 8 March 2015. 5 days after changing the CO2 gas factor from 0.773 to 0.74 | + | 8 March 2015. 5 days after changing the CO2 gas factor from 0.773 to 0.74. The gas factor was changed before run 2552. |
{| border="0" cellpadding="2" | {| border="0" cellpadding="2" | ||
|+ Hit thresholds 180-100-25, window 44-150 | |+ Hit thresholds 180-100-25, window 44-150 | ||
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<h2>Run 2577 - solenoid off</h2> | <h2>Run 2577 - solenoid off</h2> | ||
| − | 10 March 2015. 1 day after changing the gas mixer MFCs from master/slave to independent. For this run the readout window is different from that in all the others. | + | 10 March 2015. 1 day after changing the gas mixer MFCs from master/slave to independent (this change was made before run 2563). For this run the readout window is different from that in all the others. |
{| border="0" cellpadding="2" | {| border="0" cellpadding="2" | ||
|+ Hit thresholds 180-100-25, window 64-170 | |+ Hit thresholds 180-100-25, window 64-170 | ||
Revision as of 11:28, 30 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.
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
- 1 Run 2451 - solenoid off
- 2 Run 2551 - solenoid off
- 3 Run 2560 - solenoid off
- 4 Run 2577 - solenoid off
- 5 Run 2616 - solenoid at 1200A (?)
- 6 Run 2617 - solenoid at 1200A
- 7 Run 2619 - solenoid at 1200A
- 8 Run 2642 - solenoid off
- 9 Run 2644 - solenoid off
- 10 Run 2649 - solenoid off
- 11 Run 2676 - solenoid off
Run 2451 - solenoid off
7 Feb 2015. First run of 2015. Increased sparsification thresholds from 7sigma to 15sigma
Garfield 5475-4525 Ar-CO2 has tmax ~560ns
Run 2551 - solenoid off
2-3 March 2015. 3 weeks after disengaging the alcohol bubbler.
Run 2560 - solenoid off
8 March 2015. 5 days after changing the CO2 gas factor from 0.773 to 0.74. The gas factor was changed before run 2552.
Run 2577 - solenoid off
10 March 2015. 1 day after changing the gas mixer MFCs from master/slave to independent (this change was made before run 2563). For this run the readout window is different from that in all the others.
Run 2616 - solenoid at 1200A (?)
11 March 2015. 2 days after changing the gas mixer MFCs from master/slave to independent
Run 2617 - solenoid at 1200A
11 March
Run 2619 - solenoid at 1200A
12 March
Run 2642 - solenoid off
14 March. After moving CO2 controller from ch2 to ch4 (on March 13) and decreasing sparsification thresholds to 8sigma
Run 2644 - solenoid off
16 March.
Run 2649 - solenoid off
17 March. 10 hours after returning CO2 controller from ch4 to ch2
Run 2676 - solenoid off
22 March.
