Difference between revisions of "May 7, 2014 Calibration"
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GlueX Calibration Meeting<br> | GlueX Calibration Meeting<br> | ||
| − | Wednesday, | + | Wednesday, May 7, 2014<br> |
'''<span style="color:#ff0000"> 10:45 am</span>''', EDT<br> | '''<span style="color:#ff0000"> 10:45 am</span>''', EDT<br> | ||
JLab: CEBAF Center, F326<br> | JLab: CEBAF Center, F326<br> | ||
| Line 19: | Line 19: | ||
# [[GlueX-Collaboration-May-2014|Collaboration Meeting]] May 12-14 | # [[GlueX-Collaboration-May-2014|Collaboration Meeting]] May 12-14 | ||
# Status Update | # Status Update | ||
| − | # Tracking | + | # Tracking [[CDC_B_field]] |
# Calorimetry | # Calorimetry | ||
# Other systems | # Other systems | ||
# Simulations and Calibrations | # Simulations and Calibrations | ||
| + | |||
| + | == Minutes == | ||
| + | |||
| + | Attending: Sean, Amiran (NU); Curtis, Naomi (CMU); Simon, Lubomir, Mark (JLab); Justin (MIT) | ||
| + | |||
| + | # [[GlueX-Collaboration-May-2014|Collaboration Meeting]] May 12-14 | ||
| + | #* Sean will collect information about the measurements that each subdetector group is planning to make this year for the calibration discussion next Tuesday, | ||
| + | # Status Update | ||
| + | #* Sean has been working on applying constants to the digitized values. This has involved reviewing the constants needed and working through some lingering bugs with EVIO file reading/writing with David L. | ||
| + | # Tracking | ||
| + | #* Naomi reported on plans to correct the drift distance calculations for the variation of the magnetic field in the CDC. | ||
| + | #** In the CDC volume, the magnetic field varies from 1.3T to 1.9T at nominal current, primarily in z. | ||
| + | #** At large drift radius, she finds that the drift radius changes by a maximum ~30um per 0.1T, compared to a resolution of 80-100um. | ||
| + | #** To correct for this effect, the plan is to get a best guess for the r,z of the hit, guess the B field at that point, correct the drift time to what it would be in a 1.3T B field, then convert the time to distance using lookup tables. These corrections would be applied at the point of converting the digitized hit into a normal CDC hit. | ||
| + | #** With a "simple" parameterization of these effects, Naomi gets to within 2.5ns -> ~15um of the actual drift distance. | ||
| + | #** Sean suggested that we should have a discussion during one of the breaks in the Collaboration Meeting about how to integrate these (and other) effects into mcsmear. | ||
| + | #* Simon has added in some constants to be used for dE/dx determination. | ||
Latest revision as of 18:20, 7 May 2014
GlueX Calibration Meeting
Wednesday, May 7, 2014
10:45 am, EDT
JLab: CEBAF Center, F326
Connection Using Bluejeans
- To join via Polycom room system go to the IP Address: 199.48.152.152 (bjn.vc) and enter the meeting ID: 630804895.
- To join via a Web Browser, go to the page [1] https://bluejeans.com/630804895.
- To join via phone, use one of the following numbers and the Conference ID: 630804895
- US or Canada: +1 408 740 7256 or
- US or Canada: +1 888 240 2560
- More information on connecting to bluejeans is available.
Agenda
- Announcements
- Collaboration Meeting May 12-14
- Status Update
- Tracking CDC_B_field
- Calorimetry
- Other systems
- Simulations and Calibrations
Minutes
Attending: Sean, Amiran (NU); Curtis, Naomi (CMU); Simon, Lubomir, Mark (JLab); Justin (MIT)
- Collaboration Meeting May 12-14
- Sean will collect information about the measurements that each subdetector group is planning to make this year for the calibration discussion next Tuesday,
- Status Update
- Sean has been working on applying constants to the digitized values. This has involved reviewing the constants needed and working through some lingering bugs with EVIO file reading/writing with David L.
- Tracking
- Naomi reported on plans to correct the drift distance calculations for the variation of the magnetic field in the CDC.
- In the CDC volume, the magnetic field varies from 1.3T to 1.9T at nominal current, primarily in z.
- At large drift radius, she finds that the drift radius changes by a maximum ~30um per 0.1T, compared to a resolution of 80-100um.
- To correct for this effect, the plan is to get a best guess for the r,z of the hit, guess the B field at that point, correct the drift time to what it would be in a 1.3T B field, then convert the time to distance using lookup tables. These corrections would be applied at the point of converting the digitized hit into a normal CDC hit.
- With a "simple" parameterization of these effects, Naomi gets to within 2.5ns -> ~15um of the actual drift distance.
- Sean suggested that we should have a discussion during one of the breaks in the Collaboration Meeting about how to integrate these (and other) effects into mcsmear.
- Simon has added in some constants to be used for dE/dx determination.
- Naomi reported on plans to correct the drift distance calculations for the variation of the magnetic field in the CDC.
