Mike: Want to have analysis and calibration together. W&M has agreed to work on plex. Pedestals will be necessary for data quality. Can we run light injection and what is status of running this?
Howard: Have tried to replicate minerva as much as possible. Have taken pedestal and look good except for 1 trip chip. Additionally everything is set up for LI and LI was used during recommissioning. There was an issue with some PMTs where half of the PMT was dead. Goes with the PMT and not the board. At this point replacing PMTs is not easy, especially for some of them
Jack: Issue affected ~10% of PMTs Perhaps half of channels are not getting voltage? Maybe one Cockroft-Walton died. All issues that we saw during installation were replaced, apart from one connector that can not be connected due to a mechanical issue.
Howard:. Got about 20 minutes of beam data before accelerator went down.
Mike: For some modules the PMT and FEB are different than for MINERvA. This can affect the plex.
Howard addsed that FEB changes can also affect the tri-linear fit files. But we haven't tried to do this yet.
Chris: Step that matches fit to FEBs will have to be updated.
Mike: There were some PMTs with alternative weave. Were any of them used?
Howard and Jack: Did tried to match Red vs Blue. So replaced Red with Red, etc. But not sure if this covers all weave issues.
Anne and Chris: About 20% of the tubes had an alternate weave. MINERvA does have a record of this somewhere. It isn't just blue vs red. Should add this to the excel file. Chris says there is a MINERvA xml file in CVS, but it gives you electronics space, not tube number. But can use plex lookup maybe to find the electronics address.
[After the meeting Debbie passed along the following info:
The Tufts PMT boxes all had box numbers less than 1000.
There are two categories of boxes with the Rutgers weave: 1001-1054 and anything above box number 1299.
]
Mike: Develop a best guess plex, and then will need to look at data to see if there are issues. Also there had been some issues in MINERvA with connectors plugged in backwards etc. So will need to look carefully for issues like this.
Howard: Current beam status is that there is a work shutdown on the NuMI side (in target and absorber hall), and once that ends it will take about a week to fix it and restore beam. Work might resume in a week. Also an issue with the Linac last week, and the linac and booster beam have been off this week. [But they seem to be back on now.]
Debbie: How do we look at data? No event display yet?
Howard: We need a plex to look at the data. A few days ago ran an old-root based event display which still works. So hopefully can resurrect this event display once we have the plex. Module sets are different than they were for MINERvA. But did try to match HCAL modules with the PMTs that were originally used for HCAL modules, etc..
Mike: for next week, would be good to have a meeting to figure out what we need to know for plex. Carlos is at Fermilab now.
Howard: There is an excel file with all of the PMTs and whether red or blue (Rutgers vs Tufts). This is in the DUNE docbd in DUNE-doc-24439.
Currnelty data only stored on local disk underground. Howard: Since data is coming, had a meeting last week about getting data off of that disk. There are some action items from that meeting that Steve Timm is working on. Likely to be a follow-up meeting next week.
Alysia: Also there are meetings to discuss resurrecting the nearline monitoring.
Howard: The Arachne event display seems out now. Howard tried and could not run it.
Chris: Are the downstream modules the last 8 module sets of MINERvA?
Jack: No. They are not just the last chunk of MINERvA. Some are module sets are missing. He has prepared the following spreadsheet that gives the configuration for the full 2x2 MINERvA detector: DUNE-doc-27555.
[Alysia also started a document that describes the 2x2 MINERvA detector in DUNE-doc-27496.]
So as an action item, we need to have follow up on plex and compare the current modules to MINERvA modules.
Tammy: Want to prioritize some things to have to be done by April. Thinks that this meeting should be focused more on offline and analysis.
Noe: Working on simulation side. Running simulations with output of edepsim. Looking at DST files and trying to check that hits and digits make sense, and then propagate this through the readout simulations.
Mike: Don't need same plex in simulation and data for now, as long as using a consistent plex in simulation for now. Goal is to try to have a first stab at a plex by next week, and hopefully can allow simulation to move forward.
Tammy: In the current simulations, the number of planes does not match the number in the physical detector. Thinks that we should fix this in LArSoft. Sounds like maybe Callum is the only person who might know how to update this geometry (once we have a geometry file). Pedro suggests talking to Matt about trying to rerun with the new geometry and have a follow up meeting next week with Callum, Zack and Matt.
Tammy: Requests as an action item that people on this call should email Tammy and Alysia to tell us what you want to do.
People should use the minerva2x2 slack channel to communicate.
Also Zoya points out that it would be useful to add some items to the wiki at https://wiki.dunescience.org/wiki/ND_LAr_Analysis#MINERvA
Action Items:
Try to have another general meeting like this in 2 weeks?
Try to arrange two follow-up meetings, one on the plex, and one with Callum/Matt about updating the simulated geometry.
Form a new email list and people should email Tammy and Alysia with what they are interested in working on.