Sphenix-calibration-l mailing list

[Hugo Pereira Da Costa <hugo.pereira-da-costa AT cea.fr>]

On 9/1/2020 12:08 PM, Hugo Pereira Da Costa via sPHENIX-calibration-l 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 ?
Maybe I spoke too quickly ... Does changing the gas affects the G4Hits, 
or just the Hits ?

It certainly affects how we convert G4Hits into hits (number of 
electrons per MeV deposited by a particle), and especially if we change 
the gain. But that part does not require re-running HIJING + GEANT.

Now the gas also enters the TPC volumes definition to geant4, which 
would in turn affect GEANT4. Is that effect negligible ?

Hugo


> 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
> > > >
> > > >
> > > > ----------------------------------
> > > >
> > > > Meeting URL
> > > > https://bluejeans.com/676999731?src=join_info
> > > >
> > > > Meeting ID
> > > > 676 999 731
> > > >
> > > > Want to dial in from a phone?
> > > >
> > > > Dial one of the following numbers:
> > > > +1.408.419.1715 (United States(San Jose))
> > > > +1.408.915.6290 (United States(San Jose))
> > > > (see all numbers - https://www.bluejeans.com/premium-numbers)
> > > >
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