Re: BCAL timing (fwd from Blake)

[Elton Smith <elton@jlab.org>]

---------- Forwarded message ----------
Date: Wed, 04 Apr 2007 17:01:01 -0600
From: Blake Leverington <leverinb@uregina.ca>
To: davidl@jlab.org
Cc: Elton Smith <elton@jlab.org>, Zisis Papandreou <zisis@uregina.ca>,
     George J. Lolos <george.lolos@uregina.ca>
Subject: Re: BCAL timing

Hi David,

I had done something like this previously except for the last step
(ts8+tn8)/2 - (ts7+tn7)/2 but I'm wondering how good the walk
corrections are when you plot say n7 vs tn7-tn8. There is a walk in tn8
as well that does not completely correlate with n7 though they appear to
be corrected nicely. This is my only concern, otherwise everything looks
good from what I see. I guess this a naive question but since you are
taking the difference of 2 sums of the PMT's, does this still give you
the intrinsic resolution or is it 2 cells folded together? I suppose I
can check this myself too.

I'll use your code to see what I see in the other cells.
Thanks!

-Blake

David Lawrence wrote:
>
> Hi Blake,
>
>    I have just added a page to the wiki under BCAL analysis and
> today's date. The URL is:
>
> http://www.jlab.org/Hall-D/software/wiki/index.php/BCal_Beam_Test_Plots%2C_April_4%2C_2007
>
>
> It shows some plots and describes *a* method of extracting the timing
> resolution from the BCAL without using the tagger timing (we're still
> working on that). I would urge you to take a look and think about how
> valid the method is. I also uploaded the ROOT macros used to make the
> plots. They are linked at the bottom of the page. You should also take
> a look and make sure I didn't make any mistakes!
>
> Let me know what you think.
> Regards,
> -David