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Dear colleagues,
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<div>as requested in the meeting I'm sending a list of all the parallel trigger conditions we take at the moment:</div>
<div>1) kinematic trigger (main trigger)</div>
<div>2) Left SiPM & right TOF coinc</div>
<div>3) Right SiPM & left TOF coinc</div>
<div>4) Left leadglass & right TOF coinc (pre-scale 2)</div>
<div>5) Right leadglass & left TOF coinc (pre-scale 2)</div>
<div>6) Left SiPM (pre-scale 8)</div>
<div>7) Right SiPM(pre-scale 8)</div>
<div>8) Left TOF coinc (pre-scale 3000)</div>
<div>9) Right TOF coinc (pre-scale 3000)</div>
<div>10) Left TOF coinc & right TOF or (pre-scale 150)</div>
<div>11) Right TOF coinc & left TOF or (pre-scale 150)</div>
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<div>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).</div>
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<div>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.</div>
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<div>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.</div>
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<div>Cheers,</div>
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<div>Alexander</div>
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--<br>
Dr. Alexander Winnebeck</div>
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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>
<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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