Star-tpc-l mailing list

["Fisyak, Yuri V" <fisyak AT bnl.gov>]

Hi Flemming, you are right. Except, you should replace current to voltage.

 

                                                              Yuri Fisyak

STAR                                           Phone: +1 631 344 3913
Brookhaven National Laboratory  Fax:    +1 631 344 4206
510A/1-161
http://www.star.bnl.gov/~fisyak       E-mail: fisyak AT bnl.gov

 

 

 

From: star-tpc-l-request AT lists.bnl.gov <star-tpc-l-request AT lists.bnl.gov> on behalf of videbaek <videbaek AT bnl.gov>
Date: Thursday, November 21, 2024 at 1:35 PM
To: Star-tpc L <Star-tpc-l AT lists.bnl.gov>
Subject: [[Star-tpc-l] ] TPC voltages

Hi Yuri,

What you are monitoring is the TPC currents, not the voltages; This
explains what you see, but in many, most is not all,  case it should not
affect you analyzes. What happens at least in two runs, and this does
indeed happen many times every run period. On system goes dead (could be
TPC could be some other system, so no events are recorded (gating grid
stays closed as no triggers sho up thus the current drops to 0 , NOT the
voltage.
So once the system is dead the operator stops the runs after a short
time (up to many minutes depending on their alertness.

So you are correct if I understand you correctly, you cannot use the
average current throughout the start-stop time. The average would also
be disturb by 100% dead through the runs e.g. during auto recoveries of
TPC or TOF e.g.


Flemming






--
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