Star-tpc-l mailing list

[Richard Witt <witt AT usna.edu>]

Present: Alexei, Frank, Flemming, Tommy, Gene, Jim, Yuri, Mathias, Daniel, and myself

== Hardware

— tried to use outer readings of magnetometer but did not get reliable result

— looking for way to use manual mode of magnetometer

— discussion of whether whole TPC cylinder may have a sag (endcaps have some incline relative to each other)

— gas system is running well

— once per weak there is a half-second gas system alarm (not understood)

== Electronics

— system is stable and running well

— were up to almost 13% of iTPC channels out, but as of yesterday we’re back down to only 2 RDOs out (1 is permanent)

— occasionally see a whole iTPC RDO light-up, needs to be power cycled

— shift crew has been alerted to look for this effect and cycle the affected RDO

== Software

— Run 22 SC

— calibration production finished ~3328 runs (about 12% did not produce calibratable output)

— doing fill-by-fill, can do about 210-220 of the runs

— expect to start pass2 at the start of next week

— Discussion of track breaking in FXT runs

— effect may be more radial than azimuthal which would preferentially affect high eta more than low eta

— recently Mathias looked at -70 < vz < -50 in a collider run at 19.6 GeV 

— chosen eta range of 0.4 to 0.6 may still be to low to clearly see the effect

— found an apparent 6 degree shift between positives and negatives in 19.6 GeV collider data

— also an interesting gap in middle of sector for negatives but not positives in same data

— need Run numbers to look more closely at what is happening with the detector in that time

— lastly, track breaking does not seem to appear in embedding

— Mathias will post slides on the list

== AOB

— Nothing new reported this week.

Best Regards,

  Richard

Sent from my iPad

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

--Nelson Mandela

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