Difference between revisions of "CDC recent run drift times"
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|[[Image:cdc_run2551_t30.png|thumb|x200px|Drift time fit straws with param 6 < 30]] | |[[Image:cdc_run2551_t30.png|thumb|x200px|Drift time fit straws with param 6 < 30]] | ||
|[[Image:cdc_run2551_t30z.png|thumb|x200px|zoomed in]] | |[[Image:cdc_run2551_t30z.png|thumb|x200px|zoomed in]] | ||
− | |[[Image: | + | |[[Image:cdc_run2551_ampt.png|thumb|x200px|max amplitude vs time]] |
− | |[[Image: | + | |[[Image:cdc_run2551_ampst.png|thumb|x200px|max amplitude - pedestal, time < 500, straw 1021]] |
− | |} | + | |[[Image:cdc_run2551_amp.png|thumb|x200px|max amplitude - pedestal (all)]]|} |
<h2>Run 2560 - solenoid off</h2> | <h2>Run 2560 - solenoid off</h2> |
Revision as of 14:50, 3 April 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
- 12 Run 2688
- 13 Run 2692 - solenoid off
Run 2451 - solenoid off
7 Feb 2015. First run of 2015. Increased sparsification thresholds from 7sigma to 15sigma. Garfield 0T 5475-4525 Ar-CO2 has tmax ~560ns
Run 2551 - solenoid off
2-3 March 2015. 3 weeks after disengaging the alcohol bubbler. Garfield 0T 5600-4400 Ar-CO2 has tmax ~542ns
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Run 2560 - solenoid off8 March 2015. 5 days after changing the CO2 gas factor from 0.773 to 0.74 (should result in increase in CO2 %). The gas factor was changed before run 2552. Run 2577 - solenoid off10 March 2015. 1 day after changing the gas mixer MFCs from master/slave "blend" to independent "rate" mode (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 "blend" to independent "rate" mode. Garfield 1.75T 5600-4400 Ar-CO2 has tmax ~596ns Run 2617 - solenoid at 1200A11 March Run 2619 - solenoid at 1200A12 March Run 2642 - solenoid off14 March. After moving CO2 controller from ch2 to ch4 (on March 13) and decreasing sparsification thresholds to 8sigma Run 2644 - solenoid off16 March. Run 2649 - solenoid off17 March. 10 hours after returning CO2 controller from ch4 to ch2
Run 2676 - solenoid off22 March.
Run 268826 March. switched gas mixer back from independent "rate" mode into "blend" mode
Run 2692 - solenoid off27 March. 1 day after switching gas mixer back from independent "rate" mode into "blend" mode |