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Getting Hits by detectors registered in the output root file [message #13418] Thu, 26 April 2012 22:47 Go to previous message
Raghav Kunnawalkam is currently offline  Raghav Kunnawalkam
Messages: 63
Registered: February 2012
Location: Stony Brook, New York
continuous participant
From: *physics.sunysb.edu
Hi All

As a lot of you know by now, i am working towards getting a working model of the EIC detector. I have the geometry all constructed properly and i am also seeing (in the event display) showers and collisions and every thing else.
But the one thing i am not seeing is anything inside my root files, specifically my branch FairFgtDetPoint has no data inside the leaves. Let me explain clearly.

For simplicity i will just take one detector from my EIC and work on it, FGT (Forward Gem Tracker).
If i build it fully here is the number of nodes and the volume.

Info in <TGeoManager::Voxelize>: Voxelizing...
Info in <TGeoManager::CloseGeometry>: Building cache...
Info in <TGeoManager::CloseGeometry>: 28 nodes/ 9 volume UID's in FAIR geometry
Info in <TGeoManager::CloseGeometry>: ----------------modeler ready----------------

and this is what it looks like
index.php?t=getfile&id=6959&private=0

Now i will show you how the root file looks like
index.php?t=getfile&id=6960&private=0

You can see that there is nothing inside my leaves in the root file.

For this particular FGT here is part of the geometry file:
//*************************************************
fgt01FGGD#1
cave
TUBE
air
0.000000 0.000000 -7.500000
301.000000 810.000000
0.000000 0.000000 7.500000
0.000000 0.000000 1415.000000
1.000000 0.000000 0.000000 0.000000 1.000000 0.000000 0.000000 0.000000 1.000000
//*************************************************
fgt01FGGD#2
cave
0.000000 0.000000 1515.000000
1.000000 0.000000 0.000000 0.000000 1.000000 0.000000 0.000000 0.000000 1.000000
//*************************************************
fgt01FGGD#3
cave
0.000000 0.000000 1615.000000
1.000000 0.000000 0.000000 0.000000 1.000000 0.000000 0.000000 0.000000 1.000000
//changed FGT_FR4 to FGT_kapton
fgt01FGGF#1
fgt01FGGD#1
TUBE
FGT_kapton
0.000000 0.000000 -0.125000
301.000000 810.000000
0.000000 0.000000 0.125000
0.000000 0.000000 -7.375000
1.000000 0.000000 0.000000 0.000000 1.000000 0.000000 0.000000 0.000000 1.000000
....

In order to get something in my root file, i tried to make it even simpler and built just one disc.
I find that if first volume (fgt01FGGD#1) is made of air, then no matter how many nodes of other volumes i add to my fgt detector, i am not getting anything in my root file.
But if i make it with silicon for example, then i am seeing data in the output file.

index.php?t=getfile&id=6961&private=0

This is very puzziling to me.

Another place in my EMLF detector, i have more than 9900 nodes and they all look the same except different positions in space. So i have them defined as

emlf01box#1
cave
BOX
PWO
15.000000 -15.000000 -400.000000
15.000000 15.000000 -400.000000
-15.000000 15.000000 -400.000000
-15.000000 -15.000000 -400.000000
15.000000 -15.000000 400.000000
15.000000 15.000000 400.000000
-15.000000 15.000000 400.000000
-15.000000 -15.000000 400.000000

-1485.000000 -1485.000000 3601.000000
1.000000 0.000000 0.000000 0.000000 1.000000 0.000000 0.000000 0.000000 1.000000
//*************************************************
emlf01box#2
cave
-1485.000000 -1455.000000 3601.000000
1.000000 0.000000 0.000000 0.000000 1.000000 0.000000 0.000000 0.000000 1.000000
//*************************************************
emlf01box#3
cave
-1485.000000 -1425.000000 3601.000000
1.000000 0.000000 0.000000 0.000000 1.000000 0.000000 0.000000 0.000000 1.000000
....

Here also i am facing the same problem. I am not able to register any hits in the root file, but i can see the shower that particles create on striking the detector.

Any help will be much appreciated

Cheers
Raghav

[Updated on: Thu, 26 April 2012 22:49]

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