11/30 :

I made a test sample of Au+Au Hijing events with upgr 15 with :

• 100 events
• |zvertex| < 5 cm
• sigma(zvertex) = 5 cm
• fast simulator for ssd 
• hit smearing for PIXEL and IST as well (the values are in the following pdf)

The files are located at :

/star/institutions/emn/bouchet/code/hijing_10Ev

The log of the ouput is in the same directory (0F15DBF20A9DB9D9AEFEBCFEF673B95F_0.out : ~ 15 MB)

Some plots for this sample are here.

12/01 :

another sample with the same vertex properties but with 100 events has been done.

The root files are at :

/star/institutions/emn/bouchet/code/hijing_100Ev

The log of the job is also in the same directory (B414010D4F7C0E6C15AD63F0003F4A20_0.out)

--> to do : plots

 12/02 :

 some plots for the check of the smearing are here

12/06 : last change

Few changes were applied to he code to :

• run without  a local /StarDb/VmcGeometry/ : upgr15.h was updated in CVS
• code changes in StPixelFastSimMaker.cxx and StiPixelDetectorBuilder.cxx to reflect the change of upgr15.h
• code changes in StIstDetectorBuilder.cxx to account dead materials
• a bug found that did not allowed previously the tracker to accept hits below a given radius :

in /Sti/StiKalmanTrackFinder.cxx :

--- StRoot/Sti/StiKalmanTrackFinder.cxx    2008/06/10 00:58:40    2.101
+++ StRoot/Sti/StiKalmanTrackFinder.cxx    2008/12/05 23:22:59    2.102
@@ -791,7 +791,7 @@ void StiKalmanTrackFinder::nodeQA(StiKal
 
   double xg = node->x_g();
   double yg = node->y_g();
-  if ((xg*xg + yg*yg) < 4.2*4.2) qa.qa= -2;
+//VP??  if ((xg*xg + yg*yg) < 4.2*4.2) qa.qa= -2;
 
 }
 //______________________________________________________________________________

An important change is that we have now to run in DEV (stardev).

So, to test the code I ran :

• the new code over 1 Hijing event : code in DEV + no local /StarDb/VmcGeometry (1)
• the old code over the same Hijijng event : code in SL08e + dependancy to /StarDb/VmcGeometry (2)
• the new code over the same Hijing event with pileup (3)

for (1)

the output (log +root files are at :

/star/institutions/emn/bouchet/latest_code/1Ev/

Form the log :

QA :INFO  - # TPC hits:          111072: deconvoluted:     0: Used in Fit:      74234

QA :INFO  - # SSD hits:          2016: Bad ones(flag>3): 0: Used in Fit:      1361

QA :INFO  - # Hft hits:         4685: Bad ones: 0: Used in Fit:      2578

QA :INFO  - # Ist hits:         2245: Bad ones: 0: Used in Fit:      1503

 

for (2) :

log+root files are at :

/star/institutions/emn/bouchet/code_final_mirror

from the ouput :

QA :INFO  - # TPC hits:          110969: deconvoluted:     0: Used in Fit:      73720

QA :INFO  - # SSD hits:          2016: Bad ones(flag>3): 0: Used in Fit:      1231

QA :INFO  - # Hft hits:         4685: Bad ones: 0: Used in Fit:      2440

QA :INFO  - # Ist hits:         2245: Bad ones: 0: Used in Fit:      1462

QA :INFO  - # UnKnown hits:         7286: Bad ones: 0: Used in Fit:      0

 

So we see that we have the same number of hits (first colum).

The number in the second are the hits used in tracking. As I ran here in SL08e, whereas the previous log was done in DEV, it may explain the difference.

There are also the dead material in IST that could have an effect.

 

for (3):

the output (log +root files are at :

/star/institutions/emn/bouchet/latest_code/1Ev/

Form the log :

QA :INFO  - # TPC hits:          111072: deconvoluted:     0: Used in Fit:      74292

QA :INFO  - # SSD hits:          2010: Bad ones(flag>3): 0: Used in Fit:      1382

QA :INFO  - # Hft hits:         13919: Bad ones: 0: Used in Fit:      2740

QA :INFO  - # Ist hits:         2245: Bad ones: 0: Used in Fit:      1523

So here we see the number of HFT hits increased by a factor of 2.97, due to pileup

 

Finally I ran over 40 events with the new code :

root files+ log are at :

/star/institutions/emn/bouchet/latest_code/1-40/

The following plot show :

• first row (pixel) : lYHit-lYFit (left) ;   lZHit-lZFit (right)
• second row (ist) : lYHit-lYFit (left) ;   lZHit-lZFit (right)

 

 

 

The distribution looks ok, what is a bit odd is the values of the rms : it is lower than the older code.

For pixel, rms ~ 2-3 mu whereas it was rms ~ 6-7 previously

for ist, it was rms ~ 0.023 (0.17 in Z) , now it's 0.015 (0.18)

Maybe changes in Sti from SL08e to DEV can explain those differences.

I also ran 40 events (the older file was done with 100 events)

Except of this, the code is running and ready for small production.

The how-to is here