From: Jens Ivar Jordre (jensivar.jordre@fi.uib.no)
Date: Thu Jul 31 2003 - 09:22:30 EDT
Hi Flemming.
In connection with simulation with DCs a.o. I recently noticed some bugs
in several DC classes which I have updated in my local BRAT based on
2.9.3. I will check my changes into CVS as soon as I have solved the
conflicts with the files currently in CVS. Most of the bugs relates to
static limits on arrays, resulting in overflow.
If you wish to try with my code to see if it works better, you may find
it in my ~jens/brat on RCF. I have it installed temporarily in
~jens/i386_linux24/{bin,lib,include...}, using also a local install of
ROOT compiled with debug information. Use the installed version or
compile your own BRAT based on what I have. I will start solving the
conflicts today. My updates relates to BrDriverDC, BrDCTrackingModule,
BrDC2DTrackFinder and BrLocalTrackingModule as far as I can recall.
Hope this helps.
Best wishes from
Jens Ivar
Flemming Videbaek wrote:
> Hi
> This mail will not have plots attached. During the investigations
> of the D4 response I have run into a problem which I belive is
> sub-performance of the digitization/local tracking of the DC.
>
> I setup the reco of geant track->detectortrack as Peter is doing for the
> acceptance. Further I set the positon resolution in the DC dig. to 0.
> I therefore expected to get the geanthit/track back with high accuracy,
> but it is not so. A good fraction has 'bad' xpos,ypos and slopes
> with momenta difference after matching through D4 (eff ege) of up to
> 1-2%. I do not know why this happens, but I do not shink it should.
> At least to me it pu into doubt the accuracy of this stuff.The spectrum is
> a nice peak on top a rather flat background.
>
> I am pretty sure it is connecte to the DC digi/local tracking. If I require
> that the geant x,alphax .. is close to those of the geant input the
> reconstructed momenta is precisely what you want that is dp/p.
>
> Can anyone look into this and explain the problem?
>
> regards
> Flemming
>
>
>
--
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