Star-tpc-l mailing list

[videbaek <videbaek AT bnl.gov>]

Ok,

I am talking about what the TPC PS will do. When the gating grid is 
closed there is no current (or very little) , but the voltage is still 
there. This should be reflected in the tables.

F


On 2024-11-21 16:00, Fisyak, Yuri V wrote:
> Hi Flemming, I am talking about TpcAvgPowerSupply table which has
> current, voltage, and accumulated charge.
>
>                                                               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: videbaek <videbaek AT bnl.gov>
> Date: Thursday, November 21, 2024 at 3:53 PM
> To: Fisyak, Yuri V <fisyak AT bnl.gov>
> Cc: Star-tpc L <Star-tpc-l AT lists.bnl.gov>
> Subject: Re: [[Star-tpc-l] ] TPC voltages
>
> 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

--
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