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[Richard Witt <witt AT usna.edu>]

Present: Alexei, Flemming, Jim, Yuri, Gene, and myself == Hardware & Electronics — Alexei working hard to facilitate transfer of lasers and associated equipment — electronics (water manifolds, FEEs, etc. ) all removed on east end — west end

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Present: Alexei, Flemming, Jim, Yuri, Gene, and myself

== Hardware & Electronics

— Alexei working hard to facilitate transfer of lasers and associated equipment

— electronics (water manifolds, FEEs, etc.) all removed on east end

— west end work still needs to begin (eToF modules need to be removed first)

— survey will be possible once all electronics have been removed

— surveyors have engineering drawings from Jim

— work in the WAH can only be done by technicians at present

— slows the process a little, but important for the integrity of the work

== Software

— Gene working on EMC calibration of Run 22 data (pp500) confirms old alignment is not very good

— current processing is proceeding with old alignment since it is faster

— will likely be a post-production correction for TPC momenta 

— can build on work done by Emmy 

— Gene working with Temple student to get it done

— FXT SC calibration work has been finished

— Calibration production on FXT energies has been done for Yuri’s work

— Yuri working on FXT data for 2026

— some  issues, lost MIP, but is needed for calibration work

— using simulation to try to understand the effect

— need to account for AADC threshold

— also found new feature in new cluster finder 

— some occupancy dependence in dE/dx, possibly due to truncation of clusters

— new cluster finder flags these chopped clusters (missing last 5 time bins in long clusters)

— flags on chopped clusters prevent matching which expects zero flag

— some modification of hit errors will be needed as well due to afterburner(?)

— cluster widths had been observed to be changing over Run 25 (aging?)

— need about 5000 events per run (may help with requirements for disk space, etc.)

— 300 TB of data lost when HLT farm was deactivated

— mostly cosmics

— needed for further work on survey and alignment

— Gene says ~100 TB may be available

== AOB

— Flemming mentioned work on adding FST and its support structures for simulations

— current work is on supporting rings and channels for wire trays and mounting 

— 1.8 kg of stainless steel per ring

— still need to install cable trays 

— once FST is removed can count cables and check mass of some cut samples

— TPC aging study 

— which sector is best for study?

— Yuri does not have a recommendation yet, wants to see photo of used wire vs. new

— Flemming mentioned most sectors had similar cluster shapes during period of interest

— 9 o’clock and 3 o’clock and/or a sector that has all RDOs

— NEXT MEETING: 9 APR 2026

Best Regards,

  Richard

Sent from my iPad

-- 
"Education is the most powerful weapon which you can use to change
the world."

--Nelson Mandela

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 Richard Witt, Professor of Physics     Phone (USNA): 410-293-6675
    United States Naval Academy         Email: witt AT usna.edu
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