Hi,
ok, so it's more complicated that I believed. I mean, I am thinking in
old gxint (geant3) fashion, there it was just a matter of saving somewhere
the points of the trajectory once the particle is being swimmed in the
field and through detectors, which (I assume) it's done in some step
of our chain (slic, I would imagine); otherwise we wouldn't know where are
the correct hits on the detectors.
Like this, more than a constant field, it looks there is no field at all...
which is somehow misleading, as for instance positron annihilations do not
really occur where we are seeing them to happen (especially on the front
face of the calorimeter), etc.
I agree that's it's not really a big issue and priorities now are
different, provided the simulated event we feed the reconstruction with is
correct. It could just be another useful tool to check how things are
working.
cheers
Alessandra
On Tue, 28 Apr 2015, McCormick, Jeremy I. wrote:
> Oh, I see.
>
> The swimmer which is used to make the trajectories assumes a constant B-field from what I remember of that code, so that's most likely the issue. I'm not sure how hard that would be to fix or if it would have undesirable repercussions to change it (decrease in runtime performance for instance). It would require hacking the converter so that it uses a much smaller step size and periodically updates the B-field value from the current trajectory position.
>
> -----Original Message-----
> From: Graham, Mathew Thomas
> Sent: Monday, April 27, 2015 6:07 PM
> To: McCormick, Jeremy I.
> Cc: Uemura, Sho; Alessandra Filippi; hps-software
> Subject: Re: svt detector with new geometry not visible in WIRED
>
>>
>> As far as truth particles, I believe the converter that handles this right now is hard-coded to read a single MCParticle collection with a fixed name. It could probably be easily modified to instead display all MCParticle collections regardless of their name. At least, I think that's probably why this collection wouldn't be showing in the event display.
>
>
> I think the problem is that they are showing up but not being bent correctly by the field...
>
>>
>> -----Original Message-----
>> From: [log in to unmask]
>> [mailto:[log in to unmask]] On Behalf Of Sho Uemura
>> Sent: Monday, April 27, 2015 3:49 PM
>> To: Alessandra Filippi
>> Cc: hps-software
>> Subject: Re: svt detector with new geometry not visible in WIRED
>>
>> I confirm that the v0 tracker shows up in WIRED but the v1 tracker does not - I'm doing recon on data using HPS-EngRun2015-2mm-v0 and HPS-EngRun2015-2mm-v1.
>>
>> Truth tracks from MCParticles would be nice. I wish we had those, too.
>>
>> On Mon, 27 Apr 2015, Alessandra Filippi wrote:
>>
>>> Hi,
>>> subject says it all: I'm looking to some events after slic and
>>> readout, with the new geometry EngRun2015-Nominal-v1 - I can see mc
>>> generated tracks and hits (on svt snesors as well), but no svt
>>> detector component... how can they be restored? (it would be useful
>>> to see their shape/position now after the
>>> correction)
>>> thanks, cheers
>>> Alessandra
>>>
>>> ps. btw, something that would also be useful, but I don't know how
>>> feasible, is to visualize mc truth tracks - I mean, tracks curved by
>>> the magnetic field and (possibly) multiple scattering etc., and not
>>> only the straight generated ones, which are the only ones I'm able to
>>> see (I don't now if it's just my problem).
>>>
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