Sphenix-calibration-l mailing list

[Ross Corliss <rcorliss AT mit.edu>]

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?
>> 
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>> 
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