Re: [Brahms-dev-l] TFW2

Hi Flemming & Dana,

Thanks for the update. As I understand from Hiro the BB calib is now done,
and the next step is the mrst0 calib. I think Hiro will take care of this,
but in the mean time we (Zhongbao and I) could prepare the rest of the
software/updates needed for TFW2.

Before we can change what you suggest in 3, we need the parameters of the
detector. I guess these are the same that should go into brag, maybe Dana
can help us with this? Preliminary parameters are also ok - we just need
something to get started, then we can always fine tune later.

Cheers,

Claus

> This is certainly by no means in the software. I know of various checking of
> performance indicating it is quite good -
> but not of any overall software.
>
> Let me remind you all how the calibrations and PID is setup to work with pp
> and dAu data in general without too
> much detail. This also relates very much to the recent calibrations that
> Hiro has been doing, and where the BB counters are the 'basis' for timing
> even though not nesc used for PI etc.
>
> 1. offsets/slewing etc for the start counters (td1, mrst0) is done relative
> to BB (t0) using the vertex info to correct for
> the pathlength.
> 2. This way the offsets that are deduced for tofw, h1,h2 etc can be used for
> both mrst0, or BB (td1,bb) without any change at least to a very good
> approximation.
> 3. Tfw2 should be implemented likewise.
>     - a few changes, at least, relative to how tofw is done.
>     - the gain is rather large, therefor ac-gap corrections are needed.
>     - one should describe the ADC/DE using a landau like, noit gaussian
> distr for the mean values.
>       background may be a larger issue, due to the solid angle of each slat;
> thus better cuts on dy/x probably nees to be made
>
> I will certainly help in putting the slats into brag, but it has to wait
> until after Nov 24 when I return from travel.
> It looks fairly simple once I get some missing  constants,sizes from Dana.
>
>
> Flemming
>
>
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