Hi Brad,<br><br> I had thought that there may be a correlation between the T2 and the T1 and/or T6. Last week I made two plots DBB.t2:DBBt1 and DBB.t2:DBB.t6<br><br><a href="http://jlab.org/~posik/d2n/BB/trigger/trig_check/2060_t6_t1_t2_mod.png">http://jlab.org/~posik/d2n/BB/trigger/trig_check/2060_t6_t1_t2_mod.png</a><br>
<br>There seems to be more correlation between the T2 and the T1.<br><br>I also looked at a first hit in the T2 re-timed TDC for run 2060 vs different trigger bits.<br><br> <a href="http://jlab.org/~posik/d2n/BB/trigger/2060_tdc_bit_lin_Ndata.png">http://jlab.org/~posik/d2n/BB/trigger/2060_tdc_bit_lin_Ndata.png</a><br>
<br>In the above plot the upper left box is the T2 re-timed TDC with no trigger bit cut, the upper right is re-timed TDC with T1 trigger bit cut, the bottom left is re-timed TDC with T2 trigger bit cut and the bottom right is the re-timed TDC with a T6 trigger bit cut. For the T1 and T6 bit cut the self timing peak is clear (~560) but it is hard to see any other structure so I made the same plot on log scale<br>
<br><a href="http://jlab.org/~posik/d2n/BB/trigger/2060_tdc06_bits_log.png">http://jlab.org/~posik/d2n/BB/trigger/2060_tdc06_bits_log.png</a><br><br>Looking at the T2 structure there is still a peak near chan 300 and some structure at chan <100. Comparing to the T1 and T6 you can see similar structure at same chans. <br>
<br>I am not too sure where I should be going from here with the study of the T2 trigger? <br><br>I was looking at the trigger diagram here<br><br><a href="https://hallaweb.jlab.org/wiki/index.php/DAQ_Diagrams">https://hallaweb.jlab.org/wiki/index.php/DAQ_Diagrams</a><br>
<br>Am I correct in thinking that the signal at the BB weldment (T1,T2, ect) has a time that is determined from when the detectors got a start signal? For example say a particle comes in and hits the shower causing a TDC signal. This TDC signal then triggers the shower trigger ( T1 ). The newly created T1 signal then arrives at the BB weldment and is then sent off to the trigger supervisor? I also remeber you mentioning that there should be a diagram of the trigger time gates. I was looking on the wiki but did not see them up there.<br>
<br>I am also confused on why the structure of the retimed TDCs are so much different depending on if I plot the first hit DBB.BBcerTxx[Ndata.DBB.BBcerTxx-1] or it I plot the last hit DBB.BBcerTxx[0]. Here is the same re-timed TDC plot I did above but using [0] array rather than [Ndata.DBB.BBcerTxx-1] array. Does this seem correct?<br>
<br><a href="http://jlab.org/~posik/d2n/BB/trigger/2060_tdc_bits_0.png">http://jlab.org/~posik/d2n/BB/trigger/2060_tdc_bits_0.png</a><br><br>I also checked with Kalyan about how many tracks he saw for his d2n 1pass H2 run 1258 and he said he got ~25% one track events, he did mention that this was looked at near the d2n running and may have used old mwdc software. I looked at the same run I replayed and got ~56% one track events.<br>
<br>Thanks <br>Matt<br><br><br><div class="gmail_quote">On Mon, Apr 5, 2010 at 10:44 AM, Brad Sawatzky <<a href="mailto:brads@jlab.org">brads@jlab.org</a>> wrote:<br><blockquote class="gmail_quote">
<div><div></div><div>On Wed, 31 Mar 2010, <a href="mailto:posik@jlab.org">posik@jlab.org</a> wrote:<br>
<br>
> I followed up on your suggestion to use<br>
> DBB.BBxxxTnn[Ndata.DBB.BBxxxTnn-1] instead of DBB.BBcerTnn[0]. I first<br>
> just plotted TDC 04 from run 2060 with an (DBB.evtypebits&1<<2)==(1<<2)<br>
> cut (t4.png). This is fine, but I then tried to plot the re-timed TDC<br>
> by doing<br>
><br>
> "DBB.BBcerT04[Ndata.DBB.BBcerT04-]-DBB.t2[Ndata.DBB.t2-1]+560"<br>
> with (DBB.evtypebits&1<<2)==(1<<2) cut and I get this (retimed_tdc.png).<br>
><br>
> This seems like an odd TDC structure.<br>
<br>
</div></div>Hmm... It almost looks like there are two copies of the same structure<br>
in the second plot with and amplitude ratio of about 5:1. Are the two<br>
structures correlated with different "secondary" triggers? You're<br>
cutting on T2s so they all have that trigger bit set -- I'm wondering if<br>
there's a correlation between the structure and when the event is a T2<br>
and a T1, vs. T2 and T6, etc...<br>
<br>
Just a thought.<br>
<div><div></div><div><br>
-- Brad<br>
<br>
--<br>
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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</div></div></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>