Home » PANDA » PandaRoot » General » Strange shape for the cental part of beam pipe.
Strange shape for the cental part of beam pipe. [message #9176] |
Tue, 11 August 2009 11:08 |
donghee
Messages: 385 Registered: January 2009 Location: Germnay
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first-grade participant |
From: *kph.uni-mainz.de
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Dear beampipe designer,
I have found the building block of beam pipe in pandaroot/passive/PndPipe.cxx
I'm specially interesting in the central part.
I have seen following argument and definition of beam pipe parameter at central region.
Quote: |
// The central part is totally filled because of the crossing operations
Double_t parPipeCentral[12] = { 0., 360., 3,
-32., 0., 8.,
-2., 0., .9,
20., 0., .9};
Double_t parPipeVacuumCentral[12] = { 0., 360., 3,
-32., 0., 7.9,
-2., 0., .873,
20., 0., .873};
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I'm wondering why the region -32 to 20cm in z direction was fully filled.
Even if you define the VacuumCentral afterward, I think that the defined vacuum doesn't use due to previous material definition.
This is something like overlap, which cannot report by compliler.
I assume that is a potential problem for the backward tracking in LHE tracking software.
Probably, that is the reason why we could not see enough tracks when we moving the interaction points to downstream or upstream during LHE tracking.
Do you have some other idea, or could you correct me!
Thank you.
Donghee Kang
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Re: Strange shape for the cental part of beam pipe. [message #9188 is a reply to message #9181] |
Tue, 11 August 2009 21:22 |
donghee
Messages: 385 Registered: January 2009 Location: Germnay
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first-grade participant |
From: *dip.t-dialin.net
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Dear Stepano,
Thank you for your kind correction.
I'm so sorry for careless reading.
Here comes one more question about the way of implementation of bending pipe.
When I check some geometry structure in ROOT TGeo class,
there are TPolgon as a polycone shape, which is used in the construction of beampipe at pandaroot.
It has 9 parameters.
But I think I couldn't change x and y position with this class.
I have to find another appropriate class to make a bending structure.
Do you have any idea which class could be suitable for this purpose.
For the box shape, maybe one can use TGeoXtru class, but for polygon shape, I don't know exactly what I need.
Thank you,
Donghee
[Updated on: Tue, 11 August 2009 21:23] Report message to a moderator
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