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Re: Question on R3BNeutronTracker2D [message #19369 is a reply to message #19362]

Mon, 11 July 2016 13:26

C. A. Douma
Messages: 88
Registered: September 2015
Location: Groningen

continuous participant

From: *kvi-cart.rug.nl

Dear Mr. Kresan,

I found the source of the problem concerning the beta test. The beta test works fine exactly as you designed it.
However, in my specific case the beam starts 4 meters behind the target. This causes that the collision at the target
does not happen at t=0. When beta is then computed as

beta = cluster->GetZ()/(cluster->GetT()*c);

the time requested by cluster->GetT() is the TOF between the target and NeuLAND plus the time between the beam starting point
and the target. But beta should of course be computed as

beta = cluster->GetZ()/(TOF*c);

where TOF is only the time between the cluster startpoint and the target collision.

I modified this in the neutron tracker. I also changed the beta definitions (and other similar pieces of code) to:

beta = TMath::Sqrt(cluster->GetZ()*cluster->GetZ() + cluster->GetY()*cluster->GetY() + cluster->GetX()*cluster->GetX())/(TOF*c);

so that the neutron tracker is now fully invariant under rotations etc. of the detector (relevant to simulate the EOS experiment of Igor, for example).

NOTE: the io-system of the tracker that I added here is still designed to work only for my own simulations.

Christiaan.

PS: I also noticed that the tracker still does not work with the R3B Neuland-class, only with the land-class. Is there a possibility to fix this?

Attachment: R3BNeutronTracker2D.cxx
(Size: 45.60KB, Downloaded 160 times)
Attachment: R3BNeutronTracker2D.h
(Size: 4.64KB, Downloaded 150 times)

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[Message index]

		Question on R3BNeutronTracker2D By: C. A. Douma on Thu, 07 July 2016 15:17
		Re: Question on R3BNeutronTracker2D By: Dmytro Kresan on Thu, 07 July 2016 17:00
		Re: Question on R3BNeutronTracker2D By: C. A. Douma on Thu, 07 July 2016 17:20
		Re: Question on R3BNeutronTracker2D By: Dmytro Kresan on Thu, 07 July 2016 17:42
		Re: Question on R3BNeutronTracker2D By: C. A. Douma on Thu, 07 July 2016 17:51
		Re: Question on R3BNeutronTracker2D By: C. A. Douma on Mon, 11 July 2016 13:26
		Re: Question on R3BNeutronTracker2D By: Dmytro Kresan on Mon, 11 July 2016 14:07
		Re: Question on R3BNeutronTracker2D By: C. A. Douma on Mon, 11 July 2016 15:57
		Re: Question on R3BNeutronTracker2D By: Dmytro Kresan on Tue, 12 July 2016 10:47
		Re: Question on R3BNeutronTracker2D By: C. A. Douma on Wed, 13 July 2016 14:32

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