Sphenix-calibration-l mailing list

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

Hi Ross,

Thanks for the updated numbers.

The other two numbers we need for updating the code with the new gaz 
mixture is the longitudinal and transverse diffusion for electrons (in 
cm/sqrt(cm)). Do you have them on top of your mind ? Otherwise I can 
look them up.


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/cm
> 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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