Hi Brad,<br><br><i>>I commented on this and a couple other things in an earlier note: 'Re:<br>
>BB/LHRS tracks' on 08:55 2010-04-20</i><br><br> I do not seem to have this replay in my inbox, if you still have it would you mind resending it?<br><br><br><div class="gmail_quote">On Thu, Apr 22, 2010 at 11:50 AM, Brad Sawatzky <<a href="mailto:brads@jlab.org">brads@jlab.org</a>> wrote:<br>
<blockquote class="gmail_quote"><div class="im">On Wed, 21 Apr 2010, <a href="mailto:posik@jlab.org">posik@jlab.org</a> wrote:<br>
<br>
> So I am looking into the BBNormAna stuff now. In the mean time last<br>
> night I went to look at how to get the other parameters that I will<br>
> need to compute the H2 cross section.<br>
><br>
> The first thing that I want to comment on is the shape of L.tr.tg_th,<br>
> there looks to be a dip in the center of the distribution (the middle<br>
> plot in the fig attached). Is this normal?, Or could something maybe<br>
> be blocking the angle?<br>
<br>
</div>I commented on this and a couple other things in an earlier note: 'Re:<br>
BB/LHRS tracks' on 08:55 2010-04-20. It looked strange to me too --<br>
check with Zein-Eddine and see if it makes sense to him.<br>
<div class="im"><br>
> With that said, then next thing I want to do is calculate the density<br>
> of our target. To do this I use the Ideal gas law and have<br>
</div>[ . . . ]<br>
<br>
Check with Lamiaa for the target density stuff. She should be able to<br>
point you to the correct calibrations and formulae, or put you in touch<br>
with one of the target experts. (She may have even done some of the<br>
work already.)<br>
<br>
We had a couple of independent pressure readings. I think they were all<br>
gauge pressure, but I'm not certain. There was also an issue with the<br>
gauges' "zero" set point drifting over time...<br>
<br>
I did a quick search and found this talk by Yi from last month:<br>
<a href="https://hallaweb.jlab.org/dvcslog//transversity/317">https://hallaweb.jlab.org/dvcslog//transversity/317</a><br>
And another document that might be useful:<br>
<a href="https://hallaweb.jlab.org/dvcslog//transversity/351">https://hallaweb.jlab.org/dvcslog//transversity/351</a><br>
They are worth looking at for procedure and insight into the issues<br>
found during the Transversity analysis.<br>
<div class="im"><br>
> The next thing that shows up in the cross-section is the acceptance of<br>
> the LHRS which consists of 3 parameters (d_ang,d_z and d_E). In all<br>
> papers that I have read they calculate these quantities using Monte<br>
> Carlo simulation.<br>
> I do not have a Monte Carlo set up to simulate the angular acceptance.<br>
> I spoke to Huan and he had told me that there is an acceptance problem<br>
> with his Monte-Carlo acceptance. But he had told me to I could make<br>
> acceptance cuts and just assume the angular acceptance is 1.<br>
<br>
</div>The phrase "assume the angular acceptance is 1" doesn't help much...<br>
"1" what? (Do you mean a some sort of correction factor?)<br>
<br>
We're looking for a rough check here. The nominal acceptance defined by<br>
the floor angle, P0 setting, and existing HRS calibrations should be<br>
fine. Run the details by Zein-Eddine if you run into a snag.<br>
<br>
-- Brad<br>
<br>
--<br>
<font color="#888888">Brad Sawatzky, PhD <<a href="mailto:brads@jlab.org">brads@jlab.org</a>> -<>- Jefferson Lab / Hall C / C111<br>
Ph: 757-269-5947 -<>- Fax: 757-269-5235 -<>- Pager: <a href="mailto:brads-page@jlab.org">brads-page@jlab.org</a><br>
The most exciting phrase to hear in science, the one that heralds new<br>
discoveries, is not "Eureka!" but "That's funny..." -- Isaac Asimov<br>
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</font></blockquote></div><br><br clear="all"><br>-- <br>Matthew Posik<br>Email: <a href="mailto:posik@temple.edu">posik@temple.edu</a><br>Temple University Physics Dept.<br>Office: BA-319<br>Office #: 215-204-1331 <br>
WebSites:<br>Temple:<br><a href="http://quarks.temple.edu/">http://quarks.temple.edu/</a><br>d2n:<br><a href="http://hallaweb.jlab.org/experiment/E06-014/">http://hallaweb.jlab.org/experiment/E06-014/</a><br><br>