[Olympus] Fwd: List of triggers

[Alexander Winnebeck]

Begin forwarded message:

Date: August 13, 2012 1:02:37 PM GMT+02:00
To: Michael Kohl <kohlm at jlab.org<mailto:kohlm at jlab.org>>
Subject: Re: [Olympus] List of triggers

Dear Michael,

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.
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.

Cheers,

Alexander


On Aug 13, 2012, at 11:34 AM, Michael Kohl wrote:

Dear Alexander,
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?

Are all trigger types subject to the second level trigger, or only the main trigger?

Best regards
  Michael



On Mon, 6 Aug 2012, Alexander Winnebeck wrote:

Dear colleagues,

as requested in the meeting I'm sending a list of all the parallel trigger conditions we take at the moment:
1) kinematic trigger (main trigger)
2) Left SiPM & right TOF coinc
3) Right SiPM & left TOF coinc
4) Left leadglass & right TOF coinc (pre-scale 2)
5) Right leadglass & left TOF coinc (pre-scale 2)
6) Left SiPM (pre-scale 8)
7) Right SiPM(pre-scale 8)
8) Left TOF coinc (pre-scale 3000)
9) Right TOF coinc (pre-scale 3000)
10) Left TOF coinc & right TOF or (pre-scale 150)
11) Right TOF coinc & left TOF or (pre-scale 150)

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).

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.

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.

Cheers,

Alexander

--
Dr. Alexander Winnebeck
winnebeck at mit.edu<mailto:winnebeck at mit.edu>

Massachusetts Institute of Technology (MIT)
77 Massachusetts Avenue
Bldg 26 / Rm 441
02139 Cambridge, MA, USA
Tel: +1-617-253-6580

DESY
Bldg 66 / Rm 002
Notkestrasse 85
22607 Hamburg / Germany
Tel: +49-40-8998-6402

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--
Dr. Alexander Winnebeck
winnebeck at mit.edu<mailto:winnebeck at mit.edu>

Massachusetts Institute of Technology (MIT)
77 Massachusetts Avenue
Bldg 26 / Rm 441
02139 Cambridge, MA, USA
Tel: +1-617-253-6580

DESY
Bldg 66 / Rm 002
Notkestrasse 85
22607 Hamburg / Germany
Tel: +49-40-8998-6402


--
Dr. Alexander Winnebeck
winnebeck at mit.edu<mailto:winnebeck at mit.edu>

Massachusetts Institute of Technology (MIT)
77 Massachusetts Avenue
Bldg 26 / Rm 441
02139 Cambridge, MA, USA
Tel: +1-617-253-6580

DESY
Bldg 66 / Rm 002
Notkestrasse 85
22607 Hamburg / Germany
Tel: +49-40-8998-6402

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