<div dir="ltr">I am already working on the resolution in Task 3. I'll check with varying it by a few mm.</div><div class="gmail_extra"><br><div class="gmail_quote">On Fri, Sep 4, 2015 at 8:24 AM, Stepan Stepanyan <span dir="ltr"><<a href="mailto:stepanya@jlab.org" target="_blank">stepanya@jlab.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Dear all,<br>
<br>
There was a discussion at yesterday's software meeting about the ECal positioning.<br>
I want to ask if some of you can do quick studies of some issues to clarify few things.<br>
It might be that these questions have been already answered and someone knows the<br>
answers, or someone is in process of getting this resolved, so please share whatever<br>
you have with the group. Here are the questions:<br>
1) what is the track extrapolated position resolution at the ECal?<br>
Basically I want to have have few thousands E=0.5 GeV e+ and e- be simulated in groups<br>
of fixed angles, phi and theta, and for each group distribution of X and Y positions<br>
at the calorimeter been studied. The field map can be anything, as long as it has stray<br>
field distribution<br>
<br>
2) what is the effect of the ECal Y-position on the trigger performance?<br>
This simply can be the same studies Kyle does with the trigger, but with different<br>
Y-positions of the ECal. Kyle already has one fixed position studied, if he can do<br>
the same by moving top ECal by 1 mm, 2mm, 3mm ... and see how trigger efficiency<br>
to A's changes, then move both the same way. I want to understand how much ECal<br>
should be misaligned to effect our trigger.<br>
<br>
3) what is the effect of the Y-alignment on the ECal energy resolution?<br>
Here the worry is that when we do sampling fraction corrections, that corrections<br>
depend on the position of the hit. Closer to the edges, e.g. in row 1, larger the<br>
corrections. Of course closer to the edges worse resolution we will have. Now one<br>
can derive sampling fraction correction as a function of hit position in row 1 using<br>
some geometry (nominal will work), then correct cluster energy by applying sampling<br>
fraction correction not for the position that cluster reconstruction algorithm is giving<br>
but shift it by 1 mm, 2mm , 3 mm ..., and look to see what is the energy resolution and<br>
compare to the nominal one.<br>
<br>
Please let me know if anyone can take any of these tasks and if there are questions<br>
on what is above.<br>
<br>
Thanks, Stepan<br>
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