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<div>Begin forwarded message:</div>
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<span style="font-family:'Helvetica'; font-size:medium; color:rgba(0, 0, 0, 1);"><b>Date:
</b></span><span style="font-family:'Helvetica'; font-size:medium;">August 13, 2012 1:02:37 PM GMT+02:00<br>
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<span style="font-family:'Helvetica'; font-size:medium; color:rgba(0, 0, 0, 1);"><b>To:
</b></span><span style="font-family:'Helvetica'; font-size:medium;">Michael Kohl <<a href="mailto:kohlm@jlab.org">kohlm@jlab.org</a>><br>
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<span style="font-family:'Helvetica'; font-size:medium; color:rgba(0, 0, 0, 1);"><b>Subject:
</b></span><span style="font-family:'Helvetica'; font-size:medium;"><b>Re: [Olympus] List of triggers</b><br>
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Dear Michael,
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<div>you are right. No 10 and 11 are 3 out of 4 coincidences, which were meant to monitor TOF efficiencies. Due to hardware limitations the main trigger requires four-fold coincidences.</div>
<div>Every trigger condition of the first level (L1) has it's own second level (L2) condition as I presented various times. You can have a bypass, left hit, right hit, or left and right hit for L2.</div>
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<div>Cheers,</div>
<div><br>
</div>
<div>Alexander</div>
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<div>
<div>On Aug 13, 2012, at 11:34 AM, Michael Kohl wrote:</div>
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<div>Dear Alexander,<br>
isn't 10)+11) part of the "3 out of 4" proposed by A. Kisselev, which allows to monitor the tof efficiencies (and coincidence efficiency)? Or is this feature already part of 1) main trigger?<br>
<br>
Are all trigger types subject to the second level trigger, or only the main trigger?<br>
<br>
Best regards<br>
Michael<br>
<br>
<br>
<br>
On Mon, 6 Aug 2012, Alexander Winnebeck wrote:<br>
<br>
<blockquote type="cite">Dear colleagues,<br>
</blockquote>
<blockquote type="cite"><br>
</blockquote>
<blockquote type="cite">as requested in the meeting I'm sending a list of all the parallel trigger conditions we take at the moment:<br>
</blockquote>
<blockquote type="cite">1) kinematic trigger (main trigger)<br>
</blockquote>
<blockquote type="cite">2) Left SiPM & right TOF coinc<br>
</blockquote>
<blockquote type="cite">3) Right SiPM & left TOF coinc<br>
</blockquote>
<blockquote type="cite">4) Left leadglass & right TOF coinc (pre-scale 2)<br>
</blockquote>
<blockquote type="cite">5) Right leadglass & left TOF coinc (pre-scale 2)<br>
</blockquote>
<blockquote type="cite">6) Left SiPM (pre-scale 8)<br>
</blockquote>
<blockquote type="cite">7) Right SiPM(pre-scale 8)<br>
</blockquote>
<blockquote type="cite">8) Left TOF coinc (pre-scale 3000)<br>
</blockquote>
<blockquote type="cite">9) Right TOF coinc (pre-scale 3000)<br>
</blockquote>
<blockquote type="cite">10) Left TOF coinc & right TOF or (pre-scale 150)<br>
</blockquote>
<blockquote type="cite">11) Right TOF coinc & left TOF or (pre-scale 150)<br>
</blockquote>
<blockquote type="cite"><br>
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<blockquote type="cite">The triggers 8-11 should be re-visited. At the moment nobody is using them as far as I know. The triple coincidences (10+11) can only be used with WC reconstruction and these triggers are actually only a subset of the single arm trigger
(8+9).<br>
</blockquote>
<blockquote type="cite"><br>
</blockquote>
<blockquote type="cite">There is always this classical decision about parallel calibration triggers or dedicated calibration runs. To come to a conclusion about this it is required to know something about the speed of efficiency variations. Therefore it would
be very useful if the subgroups look into their calibration data from the February run and try to answer this question.<br>
</blockquote>
<blockquote type="cite"><br>
</blockquote>
<blockquote type="cite">When I don't get any complains within a week, I will remove conditions 10+11 and tune the pre-scaling factors such a way that the calibration triggers (4-9) do have the same countrate as the main trigger.<br>
</blockquote>
<blockquote type="cite"><br>
</blockquote>
<blockquote type="cite">Cheers,<br>
</blockquote>
<blockquote type="cite"><br>
</blockquote>
<blockquote type="cite">Alexander<br>
</blockquote>
<blockquote type="cite"><br>
</blockquote>
<blockquote type="cite">--<br>
</blockquote>
<blockquote type="cite">Dr. Alexander Winnebeck<br>
</blockquote>
<blockquote type="cite">winnebeck@mit.edu<<a href="mailto:winnebeck@mit.edu">mailto:winnebeck@mit.edu</a>><br>
</blockquote>
<blockquote type="cite"><br>
</blockquote>
<blockquote type="cite">Massachusetts Institute of Technology (MIT)<br>
</blockquote>
<blockquote type="cite">77 Massachusetts Avenue<br>
</blockquote>
<blockquote type="cite">Bldg 26 / Rm 441<br>
</blockquote>
<blockquote type="cite">02139 Cambridge, MA, USA<br>
</blockquote>
<blockquote type="cite">Tel: +1-617-253-6580<br>
</blockquote>
<blockquote type="cite"><br>
</blockquote>
<blockquote type="cite">DESY<br>
</blockquote>
<blockquote type="cite">Bldg 66 / Rm 002<br>
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<blockquote type="cite">Notkestrasse 85<br>
</blockquote>
<blockquote type="cite">22607 Hamburg / Germany<br>
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<blockquote type="cite">Tel: +49-40-8998-6402<br>
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--<br>
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<a href="mailto:winnebeck@mit.edu">winnebeck@mit.edu</a><br>
<br>
Massachusetts Institute of Technology (MIT)<br>
77 Massachusetts Avenue<br>
Bldg 26 / Rm 441<br>
02139 Cambridge, MA, USA<br>
Tel: +1-617-253-6580<br>
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DESY<br>
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--<br>
Dr. Alexander Winnebeck</div>
<div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">
<a href="mailto:winnebeck@mit.edu">winnebeck@mit.edu</a><br>
<br>
Massachusetts Institute of Technology (MIT)<br>
77 Massachusetts Avenue<br>
Bldg 26 / Rm 441<br>
02139 Cambridge, MA, USA<br>
Tel: +1-617-253-6580<br>
<br>
DESY<br>
Bldg 66 / Rm 002<br>
Notkestrasse 85<br>
22607 Hamburg / Germany<br>
Tel: +49-40-8998-6402</div>
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