sPHENIX tracking discussion

[sookhyun lee <dr.sookhyun.lee AT gmail.com>]

Hi Tony,

These were not hits from reconstructed tracks, purely clusters in SvtxClusterMap before any tracking starts. Testing my seeding module, I print out all clusters that are on the seeding layers.

If we have 5 clusters per layer coming from 1 particle, we probably suffer from a large number of ghost tracks when we have 100 pions.

Best regards,

Sookhyun

On Jul 1, 2017 6:09 PM, "Anthony Frawley" <afrawley AT fsu.edu> wrote:

Hello Sookhyun,

I am running central Hijing events + 100 pions + 1 upsilon. I am scanning only embedded particles. When I plot the number of clusters per layer from the evaluator, I see about 0.9.

Can you be specific about where these printouts are located in the code?

Thanks

Tony

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From: sPHENIX-tracking-l <sphenix-tracking-l-bounces AT lists.bnl.gov> on behalf of sookhyun lee <dr.sookhyun.lee AT gmail.com>
Sent: Saturday, July 1, 2017 6:46 PM
To: pinkenburg
Cc: sphenix-tracking-l AT lists.bnl.gov
Subject: Re: [Sphenix-tracking-l] please update your tpc macro

 

Hi Chris and Carlos,

I ran a single pion (single track in an event) and noticed that the number of TPC clusters for a track per a TPC layer is ~5 as compare to ~1 before the change. I worry that this will generate a large number of ghost tracks.

Carlos, could you please take a look into it? 

Thanks,

Sookhyun

Please find more information on the TPC clusters generated from a single pion. Layer 7 is the first layer of the TPC. 

 adding cluster, id =  0, layer = 3

 adding cluster, id =  1, layer = 4

 adding cluster, id =  2, layer = 5

 adding cluster, id =  3, layer = 6

 adding cluster, id =  4, layer = 0

 adding cluster, id =  5, layer = 1

 adding cluster, id =  6, layer = 2

 adding cluster, id =  7, layer = 7

 adding cluster, id =  8, layer = 7

 adding cluster, id =  9, layer = 7

 adding cluster, id =  10, layer = 7

 adding cluster, id =  11, layer = 7

SimpleHit3D: id: 7 layer: 7 (x,y,z) = (-17.7106,-24.702,10.8538)

       ( 1.1744e-07 , -8.42012e-08 , 0 )

err  = ( -8.42012e-08 , 6.03698e-08 , 0 )

       ( 0 , 0 , 1.69597e-07 )

       ( 4.06825e-07 , -2.91682e-07 , 0 )

size = ( -2.91682e-07 , 2.09127e-07 , 0 )

       ( 0 , 0 , 5.87502e-07 )

SimpleHit3D: id: 8 layer: 7 (x,y,z) = (-17.4856,-24.8618,11.0598)

       ( 8.52803e-06 , -5.99789e-06 , 0 )

err  = ( -5.99789e-06 , 4.2184e-06 , 0 )

       ( 0 , 0 , 2.04e-05 )

       ( 2.9542e-05 , -2.07773e-05 , 0 )

size = ( -2.07773e-05 , 1.4613e-05 , 0 )

       ( 0 , 0 , 7.06678e-05 )

SimpleHit3D: id: 9 layer: 7 (x,y,z) = (-17.3943,-24.9258,11.1125)

       ( 0.000214193 , -0.000149473 , 0 )

err  = ( -0.000149473 , 0.000104309 , 0 )

       ( 0 , 0 , 0.00104963 )

       ( 0.000741986 , -0.000517789 , 0 )

size = ( -0.000517789 , 0.000361335 , 0 )

       ( 0 , 0 , 0.00363603 )

SimpleHit3D: id: 10 layer: 7 (x,y,z) = (-17.7837,-24.6494,10.5171)

       ( 3.009e-05 , -2.17089e-05 , 0 )

err  = ( -2.17089e-05 , 1.56622e-05 , 0 )

       ( 0 , 0 , 1.95593e-05 )

       ( 0.000104235 , -7.52018e-05 , 0 )

size = ( -7.52018e-05 , 5.42555e-05 , 0 )

       ( 0 , 0 , 6.77554e-05 )

SimpleHit3D: id: 11 layer: 7 (x,y,z) = (-17.9813,-24.5057,11.1276)

       ( 1.15831e-06 , -8.49925e-07 , 0 )

err  = ( -8.49925e-07 , 6.23642e-07 , 0 )

       ( 0 , 0 , 0.00240514 )

       ( 4.01251e-06 , -2.94423e-06 , 0 )

size = ( -2.94423e-06 , 2.16036e-06 , 0 )

       ( 0 , 0 , 0.00833165 )

On Sat, Jul 1, 2017 at 10:34 AM, pinkenburg <pinkenburg AT bnl.gov> wrote:

Hi folks,

the tpc macro has been updated for the changes in the tpc clusterizer and the running time is back to normal. The code is back in and a build is ongoing (give it 30 minutes). Please pull the updated macro from github - or wait a really long time :)

Chris

--
*************************************************************

Christopher H. Pinkenburg       ;    pinkenburg AT bnl.gov
                                ;    http://www.phenix.bnl.gov/~pinkenbu

Brookhaven National Laboratory  ;    phone: (631) 344-5692
Physics Department Bldg 510 C   ;    fax:   (631) 344-3253
Upton, NY 11973-5000

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