Run 19 SC & GL calibrations so far
Updated on Wed, 2019-09-25 14:00. Originally created by genevb on 2019-09-25 13:59.
Fixed target: negligible (findings by Ben Kimelman)
Collision findings below by Matt Posik & Babu Pokhrel
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AuAu 7.7 GeV collisions:
Completed (going into database). Very weak dependences; all values negative.
![](/STAR/system/files/userfiles/17/image/Calibrations/SpaceCharge_GridLeak/Run19_AuAu7p7/Run19_AuAu7p7_SC.png)
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AuAu 19.6 GeV collisions:
Completed (going into database). Noticeable luminosity dependence; some negative values.
![](/STAR/system/files/userfiles/17/image/Calibrations/SpaceCharge_GridLeak/Run19_AuAu19_6/Run19_AuAu19p6_SC.png)
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AuAu 14.5 GeV collisions: [in progress!]
First pass results. Noticeable luminosity dependence; some negative values.
![](/STAR/system/files/userfiles/17/image/Calibrations/SpaceCharge_GridLeak/Run19_AuAu14p5/Run19_AuAu14p5_SC.png)
__________________
=> Worrisome feature in all three datasets is that SpaceCharge goes negative, which is not physical!
-Gene
Collision findings below by Matt Posik & Babu Pokhrel
__________________
AuAu 7.7 GeV collisions:
Completed (going into database). Very weak dependences; all values negative.
sc = (1.0 +/- 0.06206)*(-1.402e-07*(bbcx-(-1.569e+04 +/- -868))+(3.782e-07*(vpdw))) with GL = 0.36 +/- 1.65
![](/STAR/system/files/userfiles/17/image/Calibrations/SpaceCharge_GridLeak/Run19_AuAu7p7/Run19_AuAu7p7_SC.png)
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AuAu 19.6 GeV collisions:
Completed (going into database). Noticeable luminosity dependence; some negative values.
sc = (1.0 +/- 0.1388)*(-1.14e-09*(bbcw-(-1.124e+06 +/- -2.816e+05))+(1.091e-07*(vpdw))) with GL = 0.30 +/- 2.10
![](/STAR/system/files/userfiles/17/image/Calibrations/SpaceCharge_GridLeak/Run19_AuAu19_6/Run19_AuAu19p6_SC.png)
__________________
AuAu 14.5 GeV collisions: [in progress!]
First pass results. Noticeable luminosity dependence; some negative values.
sc = (1.0 +/- 0.2078)*(-3.158e-07*(bbcbb-( -6389 +/- -1019))+(8.542e-07*(zdcwnk))) with GL = 0.37 +/- 1.14
![](/STAR/system/files/userfiles/17/image/Calibrations/SpaceCharge_GridLeak/Run19_AuAu14p5/Run19_AuAu14p5_SC.png)
__________________
=> Worrisome feature in all three datasets is that SpaceCharge goes negative, which is not physical!
-Gene
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