Sphenix-calibration-l mailing list

[pinkenburg <pinkenburg AT bnl.gov>]

Hi Hugo,

I'll take care of PHG4Reco so I know when to rerun the sims. I'll add it 
to another bugfix I'll commit just now.

Chris


On 9/1/2020 4:50 PM, Hugo Pereira Da Costa via sPHENIX-calibration-l wrote:
> ok so I guess the "only" thing to do to get this going is to update 
> the code at the different places where the gaz mixture is used. If 
> noone else is working on this already, I can work on that and submit a 
> pull request today or tomorrow.
>
> The places that I know of that need change are
>
> PHG4Reco (where sPHENIX_TPC_Gas material is defined)
>
> PHG4TpcElectronDrift
>
> Are there others that you know of ?
>
>
> Hugo
>
>
>
>
> On 9/1/20 1:19 PM, Ross Corliss via sPHENIX-calibration-l wrote:
> > Hi Chris,
> >
> > The timescale of a few days matches up with the amount of production 
> > time it would take to produce the down-stream root files anyway.  If 
> > the revised run doesn't have to clobber the old dataset right away, I 
> > can't offhand think of a reason not to go ahead.
> >
> > -Ross
> > > On Sep 1, 2020, at 2:38 PM, pinkenburg via sPHENIX-calibration-l 
> > > <sphenix-calibration-l AT lists.bnl.gov> wrote:
> > >
> > > Hi Ross,
> > >
> > > the only thing that matters for the hijing running is the gas 
> > > composition. The translation into electrons is done during analysis. 
> > > Currently we use 90%Ne:10%CF4.
> > >
> > > I wouldn't be too concerned about rerunning - this takes about a day 
> > > or two. I would prefer this over adding a correction for this 
> > > somewhere downstream
> > >
> > > Chris
> > >
> > >
> > > On 9/1/2020 2:18 PM, Ross Corliss via sPHENIX-calibration-l wrote:
> > > > Hi Hugo,
> > > >
> > > > Though eventually that would be strictly correct, I think we are 
> > > > not very sensitive to that detail.  The energy loss across the 
> > > > length of the tpc (assume path of 100cm) goes from 210keV for a MIP 
> > > > to 428keV, small compared to the scales we're concerned with.
> > > >
> > > > We could for the moment get the approximately correct primary 
> > > > ionization regardless of the HIJING by scaling the TPC hit->eion by:
> > > > double gasCorrection=( 0.50 * Ne_dEdx + 0.50 * CF4_dEdx)/( 0.90 * 
> > > > Ne_dEdx + 0.10 * CF4_dEdx)
> > > >
> > > > This would give us the amount of energy that would have been 
> > > > deposited in the proper gas, and all will proceed correctly, save 
> > > > that at the end of its path the MIP will have 200keV more energy 
> > > > than it should, and slightly less deflection of its path.
> > > >
> > > > Chris, can you confirm the energy loss (or the gas mixture) assumed 
> > > > in the current hijing events?
> > > >
> > > > Are there other impacts we need to consider?
> > > >
> > > > -Ross
> > > > > On Sep 1, 2020, at 2:08 PM, Hugo Pereira Da Costa via 
> > > > > sPHENIX-calibration-l <sphenix-calibration-l AT lists.bnl.gov> wrote:
> > > > >
> > > > > Hi Ross, others
> > > > >
> > > > > Thinking more about this Gas change: I guess that means that all 
> > > > > Hijing simulations from Chris need to be redone (due to the 
> > > > > ionization/cm change) correct ?
> > > > >
> > > > > Is this really what we want to do, now, with the pressing deadlines ?
> > > > >
> > > > >
> > > > > On 9/1/2020 12:02 PM, Ross Corliss via sPHENIX-calibration-l wrote:
> > > > > > Thanks, Hugo and all who attended.
> > > > > >
> > > > > > Per discussion in the meeting today, future spacecharge 
> > > > > > simulations will use Ne:CF4 50:50 gas, with the following 
> > > > > > parameters:
> > > > > >
> > > > > > double Ne_dEdx = 1.56;   // keV/cmI
> > > > > > double CF4_dEdx = 7.00;  // keV/cm
> > > > > > double Ne_NTotal = 43;    // Number/cm
> > > > > > double CF4_NTotal = 100;  // Number/cm
> > > > > >
> > > > > > double dEdx=Ne_dEdx*0.5+CF4_dEdx*0.5;
> > > > > > double NTot=Ne_NTotal *0.5+CF4_NTotal *0.5;
> > > > > >
> > > > > > these produce an expected 71.50 e-/cm for MIP tracks.
> > > > > >
> > > > > > double ionMobility=1.65; //cm^2/(V*sec)
> > > > > > double elecDriftVelocity=8;//cm/us)
> > > > > >
> > > > > > the elecDriftVelocity is essentially the same for 50:50 and 90:10 
> > > > > > (if you have a more precise number, please feel free to propose 
> > > > > > it).  The ionMobility, however, has changed by a factor of two, 
> > > > > > and the ionization is 50% higher.
> > > > > >
> > > > > > To keep the overall gain the same, the amplification gain should 
> > > > > > be scaled by the ratio 48.7/71.5 -- the 90:10 ionization per cm 
> > > > > > over the 50:50 ionization per cm.
> > > > > >
> > > > > >
> > > > > > -Ross
> > > > > >
> > > > > >
> > > > > >
> > > > > > > On Sep 1, 2020, at 10:47 AM, Hugo Pereira Da Costa via 
> > > > > > > sPHENIX-calibration-l <sphenix-calibration-l AT lists.bnl.gov> wrote:
> > > > > > >
> > > > > > > Friendly reminder: we meet in 15 minutes. Talk to you soon !
> > > > > > >
> > > > > > > Hugo
> > > > > > >
> > > > > > >
> > > > > > > On 8/31/20 8:45 AM, Hugo Pereira Da Costa via 
> > > > > > > sPHENIX-calibration-l wrote:
> > > > > > > >   Dear all,
> > > > > > > >
> > > > > > > > Last week it was decided that the next meeting dedicated to 
> > > > > > > > space charge distortions in the TPC wil occur tomorrow, Sept. 
> > > > > > > > 1st, at 11AM EST
> > > > > > > >
> > > > > > > > It will cover activities related to both the TPC monitoring 
> > > > > > > > detector (Outer Tracker) and space charge calibration software.
> > > > > > > >
> > > > > > > > Outer Tracker specific matters, if any, will be discussed first.
> > > > > > > >
> > > > > > > > The indico page is at https://indico.bnl.gov/event/9302/
> > > > > > > >
> > > > > > > > contributions are welcome.
> > > > > > > >
> > > > > > > > Connection details are below.
> > > > > > > >
> > > > > > > > Best,
> > > > > > > >
> > > > > > > >
> > > > > > > > Hugo
> > > > > > > >
> > > > > > > >
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> > > > > > > > Want to dial in from a phone?
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> > > > > > > > Dial one of the following numbers:
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> > > --
> > > *************************************************************
> > >
> > > Christopher H. Pinkenburg    ;    pinkenburg AT bnl.gov
> > >                 ;    http://www.phenix.bnl.gov/~pinkenbu
> > >
> > > Brookhaven National Laboratory    ;    phone: (631) 344-5692
> > > Physics Department Bldg 510 C    ;    fax:   (631) 344-3253
> > > Upton, NY 11973-5000
> > >
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--
*************************************************************

Christopher H. Pinkenburg       ;    pinkenburg AT bnl.gov
                                ;    http://www.phenix.bnl.gov/~pinkenbu

Brookhaven National Laboratory  ;    phone: (631) 344-5692
Physics Department Bldg 510 C   ;    fax:   (631) 344-3253
Upton, NY 11973-5000

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