Star-tpc-l mailing list

[videbaek <videbaek AT bnl.gov>]

TPC meeting Apr 4, 2024
Present: alexe, jim, flemming, gene, Frank, Yuri, yannik




Hardware:

Argon started Monday. Blue sheet has been delayed.
Argon will be delivered next Monday.

Will start flammable gasses today.
No short currently –
Discussed what to do if a short is found – gene’s pref. to try to fix 
it.
Might help to have laser to diagnose. Should pole tip

Sensors for motion is live.

Electronics:

Ready for run – except Tonko will perform pulser runs, and determine 
gain tables and dead/hot channels once magnet is stabilized. Maybe 
tomorrow early.

Software:

Run 22 space charge Rich S.  Did another pass on days (4 days) ongoing, 
using production system with long queue.
Should be able to get fill-by-fill outcome of this pass.
If has to be for full production about 20,000 runs. Preparing for this.

Yuri Working with alignment. Problem to get stable results of data from 
runs. Possible weeks. No firm estimate for when results can be available 
Time scale weeks.
Preparing for data taking. Cron job for filling of tables.

Frank brought up the points, as for S&C meeting, that production for pp 
500 (run22) really have to start  soon.

Longer discussion on findings from eTOF group that it seems that 
projection from itpc only seem only to match with large deviation.

Rather than iterate discussion point out for next week’s  eTOF meeting 
Apr 11 10.00am EDT we will have a joint discussion on this issues.
Some points brought up -
-	Track extension done with helix. What is effect of tracking in 
non-homogeneous magnetic field – particular radial changes.
-	Some effect are order of up to 8cm deviations, unlikely this can be 
result of misalignment as current alignment deviations are order mm.
-	Are there effect from the very long clusters in FXT data for iTPC 
response.
-       Is this also seen in collider data?
-       Is there a difference in OO with FF vs RFF data?

--
Flemming Videbaek
senior scientist, emeritus
videbaek @ bnl.gov
Brookhaven National Lab
Physics Department
Bldg 510D
Upton, NY 11973

phone: 631-344-4106
cell     :  631-681-1596