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[Richard Witt <witt AT usna.edu>]

Present: Alexei, Flemming, Jim, Yuri, Daniel, Gene, and myself == Hardware — On Tuesday there was a global power dip around 4-5am — restarted systems — when got to water, a large water leak began on west side — pole tip was removed, found 0. 5”

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

== Hardware

— On Tuesday there was a global power dip around 4-5am 

— restarted systems

— when got to water, a large water leak began on west side

— pole tip was removed, found 0.5” pipe to inner sector #1 became disconnected (pressure spike?)

— some RDOs and FEEs were removed

— tried yesterday, ran with no problem 

— when tried interlock mode system dropped for ~10 second period

— seems to be a signal coming from STAR that shuts down water after 10 seconds

— During removal of west pole tip worked on lasers

— east laser is at least factor ~6 brighter now

— ordered spare window (changed every few years or so)

— RHIC will have no power Tuesday due to power line repairs to be undertaken

— need to have TPC in purge mode

== Electronics

— Tonko working on electronics during all of this

— will start on east side

— some work will require water flow, so that has to be coordinated

== Software

— pp200 low-lumi 2024 dE/dx calibration

— need to check with DEV

— Gene suggests maybe check with P24iy rather than DEV

== AOB

— QA discussions for current run

— many electronics channels coming on or off for short periods

— easiest thing to do is remove whole RDO for some period (10 minutes? Whole run?)

— need to ensure whatever method is used actually kills hits in RDO regions marked dead

— otherwise TPC hit code may use hits in that region even if the RDO is marked dead

— these often occur in runs that may have several million good events, so don’t want to kill whole run unless absolutely necessary

— Yuri mentioned some anode sections with lowered voltages need to be considered as well

— Daniel working on ToF calibration in O+O running

— noticed splitting in proton mass, larger in RFF than in FF field

— occurs in positive eta for RFF and negative eta for FF

Best Regards,

  Richard

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