Difference between revisions of "Jun 4, 2015 Calorimetry"
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# Announcements | # Announcements | ||
# Action Items | # Action Items | ||
+ | # Summer plans | ||
+ | #* [https://mailman.jlab.org/pipermail/halld/2015-May/000220.html Power Outage in Hall D] (Tim) | ||
+ | #* [https://mailman.jlab.org/mailman/private/gluex-collaboration/2015-May/004083.html Shutting power down] (Fernando) | ||
# FCAL Update | # FCAL Update | ||
# BCAL Update | # BCAL Update | ||
# F250 firmware discussion | # F250 firmware discussion | ||
− | #* [ | + | #* [https://halldweb.jlab.org/doc-private/DocDB/ShowDocument?docid=2752 GlueX-doc-2752 fADC250 Operational Characterization: Air Flow, Temperature and Pedestals] |
# Reconstruction and Simulation | # Reconstruction and Simulation | ||
#* [https://mailman.jlab.org/pipermail/halld-cal/2015-June/001070.html pi0 peak reconstruction] (Tegan) | #* [https://mailman.jlab.org/pipermail/halld-cal/2015-June/001070.html pi0 peak reconstruction] (Tegan) | ||
Line 43: | Line 46: | ||
#* [[Media:BCAL_Effective_velocity_v2.pdf | BCAL - Effective Velocities and Time Offsets]] (George) | #* [[Media:BCAL_Effective_velocity_v2.pdf | BCAL - Effective Velocities and Time Offsets]] (George) | ||
# Any other business | # Any other business | ||
+ | #* [[Media:BCAL_Radial_Dimensions.pdf | BCAL - Radial Dimensions]] (George) | ||
= Minutes = | = Minutes = | ||
− | ''Attendees: | + | ''Attendees: Elton, Matt, Mark, Adesh, Manuel, Will (JLab); George (Athens); Sean (NW); Noemi, Ahmed, Tegan (UofR). |
+ | |||
+ | # Announcements | ||
+ | # Action Items | ||
+ | # Summer plans | ||
+ | #* [https://mailman.jlab.org/pipermail/halld/2015-May/000220.html Power Outage in Hall D] (Tim) | ||
+ | #* [https://mailman.jlab.org/mailman/private/gluex-collaboration/2015-May/004083.html Shutting power down] (Fernando) | ||
+ | # FCAL Update | ||
+ | ## FCAL studies of Pedestal and Pulse Integral (Manuel) | ||
+ | ##* See Log Entry [https://logbooks.jlab.org/entry/3342815 3342815] | ||
+ | ##* Study of pedestal widths depending on number of samples, either in a single event or over multiple events | ||
+ | ##* Consider using a rolling average (using multiple events) | ||
+ | ##* Data set from last summer taken at about 100 Hz | ||
+ | ##* Finds variation of peak/peak ~ 1.5 %. | ||
+ | ##* Sean: Studies of optimal NSA should look at beam data, since pulse shapes may be different between pulser and physics data. | ||
+ | ##* Elton: Should look at the pulse height variation of the widths. | ||
+ | ## Calibration (Adesh) | ||
+ | ##* Working on plugins, but debugging in progress | ||
+ | ##* Goal is to create pi0 and electron skimmed files with ROOT trees for ease in calibration | ||
+ | ## Other | ||
+ | ##* Jon is working on firmware for bases. | ||
+ | # BCAL Update | ||
+ | ## [https://logbooks.jlab.org/entry/3342732 LED bias scans] (Mark) | ||
+ | ##* Completed analysis of bias scans. | ||
+ | ##* Some interesting results. Results depend (very slightly) on which LED side the pulser is flashing. | ||
+ | ##* At the Vover=0 V we still measure a small signal (~5% of nominal) indicating that the break down voltage is not precisely set (to within about 50 mV). | ||
+ | ##* Estimating the gain changes between the fall and spring run gives (T=18 deg V=1.2 / T=10 deg V=1.4) ~ 0.73. The ratio of gains determined by Will using pi0s gives a ratio of 0.69. Consistency is within 6%. The remaining difference might be able to be explained by temperature changes of the LED and could be investigated by taking data with opposite sides set a different temperatures. However, in practice we will need to calibrate with data at the settings of the experiment, so detailed understanding of these systematics are probably not necessary. | ||
+ | # F250 firmware discussion | ||
+ | ## [https://halldweb.jlab.org/doc-private/DocDB/ShowDocument?docid=2752 GlueX-doc-2752 fADC250 Operational Characterization: Air Flow, Temperature and Pedestals] | ||
+ | # Reconstruction and Simulation | ||
+ | ##* [https://mailman.jlab.org/pipermail/halld-cal/2015-June/001070.html pi0 peak reconstruction] (Tegan) | ||
+ | ##* Comparison of mcsmear output using original and updated code. | ||
+ | ##* Comparison is reasonable, but differences remain. | ||
+ | ##* Pi0 peak for both reconstructions is at about 100 MeV. Suggested that variation=mc for ccdb should be used. [Note added: Tegan already made new plots with this setting and indeed peaks went up to about 120 MeV] | ||
+ | ##* [Note added] Elton: At this point, the comparison between new/old is not as important as understanding how the generated energies in geant are propagated to simulated hits with new code. | ||
+ | ## Efficiencies (Ahmed) | ||
+ | ##* Trying to investigate differences in efficiencies between mode 7 and mode 8 by targeting events which are not reconstructed | ||
+ | ##* Finding some inconsistencies between hdview2 and analysis, which needs further investigation | ||
+ | # Calibration | ||
+ | #* [[Media:BCAL_Effective_velocity_v2.pdf | BCAL - Effective Velocities and Time Offsets]] (George) | ||
+ | #* Good progress. Systematic differences between layers is notable, but is smaller for cosmic-rays compared to beam data. | ||
+ | #* Sean: Mike Staib is working on CDC alignment, and may have useful tracking updates | ||
+ | #* Will: Could consider using beam data with B=0 for comparison to cosmic runs | ||
+ | #* Elton: Concern that there is bias when choosing the radius of intersection for track based on the measured value of z in shower. | ||
+ | #* First report on time offsets between upstream and downstream, which are close to zero. | ||
+ | # Any other business | ||
+ | #* [[Media:BCAL_Radial_Dimensions.pdf | BCAL - Radial Dimensions]] (George) | ||
+ | #* Differences found in the geometry between different ways to access them. Elton will check with David L. |
Latest revision as of 17:11, 24 February 2017
Contents
Video Conferencing Information
Meeting Time: 11 a.m.
- To join via a Web Browser, go to the page [1] https://bluejeans.com/907185247.
- To join via Polycom room system go to the IP Address: 199.48.152.152 (bjn.vc) and enter the meeting ID: 907185247.
- To join via phone, use one of the following numbers and the Conference ID: 907185247.
- US or Canada: +1 408 740 7256 or
- US or Canada: +1 888 240 2560
- Upon connection all microphones are automatically muted. To unmute your mike on a Polycom or equivalent unit, enter *4. Unmuting on a computer is trivial as there is a microphone button than can be clicked.
- More information on connecting to bluejeans is available.
Participant Direct Lines
- JLab Phone: in CC F326 is 757-269-6460 (usual room)
- JLab Phone in CC L207 is 757-269-7084
- Phone in the Regina Video-conference Suite is 306-585-4204
- Athens Phone: in Christina's office is 011-30-210-727-6947
Action Items
- Keep events reporting z outside the BCAL physical boundaries in the "curvature" reconstruction (Tegan)
- Change BCAL and FCAL coordinates use the global coordinate system (not the target center) (who?)
- Understand BCAL efficiency estimates (cluster vs enhanced) for m7 and m8 data taking modes (Ahmed)
References
Tentative Agenda
- Announcements
- Action Items
- Summer plans
- Power Outage in Hall D (Tim)
- Shutting power down (Fernando)
- FCAL Update
- BCAL Update
- F250 firmware discussion
- Reconstruction and Simulation
- pi0 peak reconstruction (Tegan)
- Calibration
- Any other business
- BCAL - Radial Dimensions (George)
Minutes
Attendees: Elton, Matt, Mark, Adesh, Manuel, Will (JLab); George (Athens); Sean (NW); Noemi, Ahmed, Tegan (UofR).
- Announcements
- Action Items
- Summer plans
- Power Outage in Hall D (Tim)
- Shutting power down (Fernando)
- FCAL Update
- FCAL studies of Pedestal and Pulse Integral (Manuel)
- See Log Entry 3342815
- Study of pedestal widths depending on number of samples, either in a single event or over multiple events
- Consider using a rolling average (using multiple events)
- Data set from last summer taken at about 100 Hz
- Finds variation of peak/peak ~ 1.5 %.
- Sean: Studies of optimal NSA should look at beam data, since pulse shapes may be different between pulser and physics data.
- Elton: Should look at the pulse height variation of the widths.
- Calibration (Adesh)
- Working on plugins, but debugging in progress
- Goal is to create pi0 and electron skimmed files with ROOT trees for ease in calibration
- Other
- Jon is working on firmware for bases.
- FCAL studies of Pedestal and Pulse Integral (Manuel)
- BCAL Update
- LED bias scans (Mark)
- Completed analysis of bias scans.
- Some interesting results. Results depend (very slightly) on which LED side the pulser is flashing.
- At the Vover=0 V we still measure a small signal (~5% of nominal) indicating that the break down voltage is not precisely set (to within about 50 mV).
- Estimating the gain changes between the fall and spring run gives (T=18 deg V=1.2 / T=10 deg V=1.4) ~ 0.73. The ratio of gains determined by Will using pi0s gives a ratio of 0.69. Consistency is within 6%. The remaining difference might be able to be explained by temperature changes of the LED and could be investigated by taking data with opposite sides set a different temperatures. However, in practice we will need to calibrate with data at the settings of the experiment, so detailed understanding of these systematics are probably not necessary.
- LED bias scans (Mark)
- F250 firmware discussion
- Reconstruction and Simulation
- pi0 peak reconstruction (Tegan)
- Comparison of mcsmear output using original and updated code.
- Comparison is reasonable, but differences remain.
- Pi0 peak for both reconstructions is at about 100 MeV. Suggested that variation=mc for ccdb should be used. [Note added: Tegan already made new plots with this setting and indeed peaks went up to about 120 MeV]
- [Note added] Elton: At this point, the comparison between new/old is not as important as understanding how the generated energies in geant are propagated to simulated hits with new code.
- Efficiencies (Ahmed)
- Trying to investigate differences in efficiencies between mode 7 and mode 8 by targeting events which are not reconstructed
- Finding some inconsistencies between hdview2 and analysis, which needs further investigation
- Calibration
- BCAL - Effective Velocities and Time Offsets (George)
- Good progress. Systematic differences between layers is notable, but is smaller for cosmic-rays compared to beam data.
- Sean: Mike Staib is working on CDC alignment, and may have useful tracking updates
- Will: Could consider using beam data with B=0 for comparison to cosmic runs
- Elton: Concern that there is bias when choosing the radius of intersection for track based on the measured value of z in shower.
- First report on time offsets between upstream and downstream, which are close to zero.
- Any other business
- BCAL - Radial Dimensions (George)
- Differences found in the geometry between different ways to access them. Elton will check with David L.