Difference between revisions of "CDC prototype runs at CMU"
From GlueXWiki
(→CDC measurements) |
|||
| (23 intermediate revisions by the same user not shown) | |||
| Line 1: | Line 1: | ||
| − | + | The prototype runs at CMU were made with the prototype sitting along the top of one scintillator. The scintillator is only slightly larger than the prototype.<br/> | |
| + | Run 2016 at JLab was a cosmics run with the BCAL trigger. <br/> | ||
| + | The CDC runs at CMU used two scintillators in coincidence, the scintillators were above and below the CDC, separated by approx 2m. We had two sets of scintillators, one set are approx 9" wide and 6ft long, the smaller set are approx 9" x 19". Using the small scintillators, the cosmic rays would have been much closer to vertical than for the recent prototype and JLab measurements. Using the large scintillators, oriented parallel to the straw tubes, the cosmic ray angles would be similar to those with the recent prototype setup and at JLab. | ||
| + | <p> First article/prototype preamp & HVB were used for all but one of the prototype runs. One run was made using JLab preamp & HVB with all other settings unaltered since the previous run; as expected, the resulting data look very similar. </p> | ||
| − | + | ==Recent prototype runs== | |
| − | + | ||
| − | + | ||
| − | + | ||
{| border="0" cellpadding="2" | {| border="0" cellpadding="2" | ||
| Line 14: | Line 14: | ||
{| border="0" cellpadding="2" | {| border="0" cellpadding="2" | ||
|+ Prototype, 2100V, 55/45 Ar/CO2 | |+ Prototype, 2100V, 55/45 Ar/CO2 | ||
| − | |[[Image: | + | |[[Image:cdc_amp32759good.png|thumb|x200px|max amp]] |
| − | |[[Image: | + | |[[Image:cdc_t32759good.png|thumb|x200px|drift time]] |
| + | |} | ||
| + | |||
| + | {| border="0" cellpadding="2" | ||
| + | |+ Prototype, 2100V, 55/45 Ar/CO2 JLab electronics | ||
| + | |[[Image:cdc_amp32775.png|thumb|x200px|max amp]] | ||
| + | |[[Image:cdc_t32775.png|thumb|x200px|drift time]] | ||
|} | |} | ||
| Line 23: | Line 29: | ||
|[[Image:cdc_t32756.png|thumb|x200px|drift time]] | |[[Image:cdc_t32756.png|thumb|x200px|drift time]] | ||
|} | |} | ||
| + | |||
| + | ==CDC measurements at JLab== | ||
{| border="0" cellpadding="2" | {| border="0" cellpadding="2" | ||
| − | |+ CDC straw 496 2100V JLab run 2016 | + | |+ CDC straw 496 2100V JLab run 2016 (cosmics, BCAL trigger) |
|[[Image:cdc_amp2016_496.png|thumb|x200px|max amp]] | |[[Image:cdc_amp2016_496.png|thumb|x200px|max amp]] | ||
|[[Image:cdc_t2016_496.png|thumb|x200px|drift time]] | |[[Image:cdc_t2016_496.png|thumb|x200px|drift time]] | ||
| Line 31: | Line 39: | ||
{| border="0" cellpadding="2" | {| border="0" cellpadding="2" | ||
| − | |+ CDC (sum) 2100V JLab run 2016 | + | |+ CDC (sum) 2100V JLab run 2016 (cosmics, BCAL trigger) |
|[[Image:cdc_amp2016.png|thumb|x200px|max amp]] | |[[Image:cdc_amp2016.png|thumb|x200px|max amp]] | ||
|[[Image:cdc_t2016.png|thumb|x200px|drift time]] | |[[Image:cdc_t2016.png|thumb|x200px|drift time]] | ||
|} | |} | ||
| + | |||
| + | ==CDC measurements at CMU in 2013== | ||
{| border="0" cellpadding="2" | {| border="0" cellpadding="2" | ||
| − | |+ CDC (72ch) at CMU, 2100V, 50/50 Ar/CO2 | + | |+ CDC (72ch) at CMU, 2100V, 50/50 Ar/CO2 with large scint paddles along the length of the CDC |
|[[Image:cdc_amp32290.png|thumb|x200px|max amp]] | |[[Image:cdc_amp32290.png|thumb|x200px|max amp]] | ||
|[[Image:cdc_t32290.png|thumb|x200px|drift time w terrible fit]] | |[[Image:cdc_t32290.png|thumb|x200px|drift time w terrible fit]] | ||
|} | |} | ||
| − | CDC at CMU had MPV at ~190 for 2110V, 50/50 Ar/CO2. CDC wire is 20um, prototype wire is | + | |
| + | CDC at CMU had MPV at ~190 for 2110V, 50/50 Ar/CO2. <br/> | ||
| + | |||
| + | CDC wire is 20um and straw radius is 0.77cm, prototype wire is 17.8um (7 mil), and prototype straw radius is 0.79375cm. | ||
| + | {| border="0" cellpadding="2" | ||
| + | |[[Image:cdc_excerpt.png|thumb|x200px|from Blum & Rolandi]] | ||
| + | |} | ||
| + | |||
| + | <pre> | ||
| + | root [4] Double_t prototype = 1.0/log((Double_t)0.79375/(Double_t)17.8) | ||
| + | root [5] Double_t cdc = 1.0/log((Double_t)0.77/(Double_t)20.0) | ||
| + | root [6] prototype/cdc | ||
| + | (double)1.04723572482852867e+00 | ||
| + | </pre> | ||
| + | |||
| + | <pre> | ||
| + | root [0] Double_t prototype_observed_mpv = 204 | ||
| + | root [1] Double_t cdc_observed_mpv = 172 | ||
| + | root [2] prototype_observed_mpv/cdc_observed_mpv | ||
| + | (double)1.18604651162790709e+00 | ||
| + | </pre> | ||
Latest revision as of 10:41, 6 February 2015
The prototype runs at CMU were made with the prototype sitting along the top of one scintillator. The scintillator is only slightly larger than the prototype.
Run 2016 at JLab was a cosmics run with the BCAL trigger.
The CDC runs at CMU used two scintillators in coincidence, the scintillators were above and below the CDC, separated by approx 2m. We had two sets of scintillators, one set are approx 9" wide and 6ft long, the smaller set are approx 9" x 19". Using the small scintillators, the cosmic rays would have been much closer to vertical than for the recent prototype and JLab measurements. Using the large scintillators, oriented parallel to the straw tubes, the cosmic ray angles would be similar to those with the recent prototype setup and at JLab.
First article/prototype preamp & HVB were used for all but one of the prototype runs. One run was made using JLab preamp & HVB with all other settings unaltered since the previous run; as expected, the resulting data look very similar.
Recent prototype runs
CDC measurements at JLab
CDC measurements at CMU in 2013
CDC at CMU had MPV at ~190 for 2110V, 50/50 Ar/CO2.
CDC wire is 20um and straw radius is 0.77cm, prototype wire is 17.8um (7 mil), and prototype straw radius is 0.79375cm.
root [4] Double_t prototype = 1.0/log((Double_t)0.79375/(Double_t)17.8) root [5] Double_t cdc = 1.0/log((Double_t)0.77/(Double_t)20.0) root [6] prototype/cdc (double)1.04723572482852867e+00
root [0] Double_t prototype_observed_mpv = 204 root [1] Double_t cdc_observed_mpv = 172 root [2] prototype_observed_mpv/cdc_observed_mpv (double)1.18604651162790709e+00
