Star-tpc-l mailing list

[videbaek <videbaek AT bnl.gov>]

Hi Yuri,

I see that the tpcAvg..table  have both current and voltages for each PS 
channel.
BUT the Voltage doe not drop
to 0, the current does when the TPC has 100% dead time i.e no open 
gating grid.

F

On 2024-11-21 14:27, Fisyak, Yuri V wrote:
> 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

--
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