View source for July 30, 2013 Calorimetry

'<font color=red>Teleconference Time: 11:00 a.m. EST</font>''

* <font color=green>ESNET (Number is 8542553) and EVO session (GlueX Calorimetry meeting room)</font>
**  [[Video Conferencing Alternatives|Software for connecting to ESNet]]
* Phone connection only upon request.
** +1-866-740-1260 : US+Canada
** +1-303-248-0285 : International
** then enter participant code: 3421244# (remember the "#"). 
** or www.readytalk.com (and code without the #)

=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 Videoconference Suite is 306-585-4204
* Athens Phone: in Christina's office is 011-30-210-727-6947

=Items for followup from previous meeting(s)=

# <strike> Transmission: Report back on more transmission measurements (Shaun and Elton) </strike>
# <strike> FCAL cover during solenoid tests (Elton and John) </strike>

= Tentative Agenda =
 
# Announcements
# Action Items
# Monitoring
#* [https://halldweb.jlab.org/doc-private/DocDB/ShowDocument?docid=2280# FCAL Concept for FCAL Monitoring Plane]
# BCAL
## SiPMs Update
##* Three units (SN: 80 JLab, 219 JLab, 1933 USM) were found to be "hazy" during installation onto the readout assemblies at JLab.
##* We have original photos from  unit at USM after some cleaning. No degradation in performance was observed
##* [[Media:SiPMHaze1.JPG]] SiPM 1933 with "haze" at USM after cleaning
##* [[Media:SiPMHaze3 atJLab.jpg]] SiPM 1933 with "haze" at JLab during assembly
##* [[Media:SiPMHaze2.jpg]] SiPM 1933 with "haze" at JLab during assembly (zoom)
##* Likely the epoxy covering the sensor has been affected during handling. Carl is retesting them. Will keep these as spares.
# Reconstruction and Simulation 
## [https://halldweb.jlab.org/wiki/images/3/34/Calo_Meeting_0630.pdf Electrons from J/psi]
# TDR update
# Calibration of Calorimeters
# Any other business
#* Elton will be away next Tuesday. Zisis will run the meeting.

=Minutes=

''Attendees:John, Elton, Zach,  George, David, Serguei (JLab); Christina (Athens); Shaun, Andrei (UofR); Will, Alam, Elias (USM); Matt (IU); Sean Dobbs (NW).

# Announcements
#* Solenoid is cold, testing expected in the next few days
# Action Items
# Monitoring
#* [https://halldweb.jlab.org/doc-private/DocDB/ShowDocument?docid=2280# FCAL Concept for FCAL Monitoring Plane]
#* Discussion on the latest modifications to the monitoring plane. Eljen can provide UVT material for panes and also do the machining. 
#* Modifications were discussed and approved by the group. JLab will proceed with ordering the panes.
# FCAL
#* Cabling is half complete. Last pieces of the labyrinth are being machined at IU. Expect delivery in a couple of weeks. Cabling of upper section must wait on these pieces
#* The environmental monitoring system is making progress. All pieces are made and tested
#* Boxes are being fabricated and buttons being prepared. Expect a fully assembled system in a week. 
#* PLC connections will be made once Dave Butler is freed up from his solenoid duties.
#* Elton: IU contract will be completed in August. It seems everything is on track for it to be completed.
# BCAL
## Contract
##* Danny is returning to decommission the module factory in August and the contract will be completed.
## SiPMs Update
##* Three units (SN: 80 JLab, 219 JLab, 1933 USM) were found to be "hazy" during installation onto the readout assemblies at JLab.
##* We have original photos from  unit at USM after some cleaning. No degradation in performance was observed
##* [[Media:SiPMHaze1.JPG]] SiPM 1933 with "haze" at USM after cleaning
##* [[Media:SiPMHaze3 atJLab.jpg]] SiPM 1933 with "haze" at JLab during assembly
##* [[Media:SiPMHaze2.jpg]] SiPM 1933 with "haze" at JLab during assembly (zoom)
##* SN 1933 was tested several times, including once again before shipping to JLab (about six months after cleaning). No significant degradation in performance was observed relative to other sensors.
##* Likely the epoxy covering the sensor has been affected during handling. Carl is retesting them. Will keep these as spares.
##* Alam: The unit was cleaned with alcohol (isopropyl?) creating this haze. Since then any cleaning has been performed using distilled water.
##* Elton: After Carls tests, if they continue to show no change in performance, we replace them with newer units and will keep them as spares.
## Testing at Regina
##* Temperature dependence of SiPM performance continues.
##* Shaun has been away since he was at JLab and will return to working on the cosmic ray data.
# Reconstruction and Simulation (Sean Dobbs)
#* [https://halldweb.jlab.org/wiki/images/3/34/Calo_Meeting_0630.pdf Electrons from J/psi]
#* Sean showed slides with expected energy distributions of electrons from J/Psi decay. Energies range from 0 to 6-7 GeV.
#* There have been some discussions of consequences of overflow. 
#* The ADC overflows at 4096 (12 bits). The pulse sum has more bits, but it is unclear from the present MC when individual samples overflow.
#* Serguei: There is also intrinsic non-linearity in the MPPC sensors, which must be corrected even before saturation occurs.
#* Matt: One may be able to use the capabilities of the Flash to compensate for saturated pulses by fitting to the pulse shape.
#* David: Discussions on the data format for the Flash-125 are converging on a scheme that combines the sum and timing information with the slot/channel information into two words. This allows for additional bits to be used for quality factors including information about saturation. After the discussion of the Flash-125 is settled, we may wish to revisit the format for the Flash-250 and incorporate some of their ideas.
# TDR update
# Calibration of Calorimeters
# Any other business