[ee] TCS-JPsi meeting on Thursday at 9 am EST

[Charles Earl Hyde]

Stepan,
I agree with your edits.
I have limited experience with regard to CLAS triggers.
I think the main point is that we need a careful discussion of realistic
trigger
scenarios before, during, and after the Fall Engineering/Commissioning run.
Charles

> Hi Charles,
>
> Thanks for the document. I edited it, see attached.
>
> The results shown on the invariant mass distribution turned out to be a
> software issue that will be fixed in few days, so the first sub-bullet
> is removed. I looked at the fastmc simulations, it was 15 MeV for the
> full field, number is corrected.
>
> I talked to Sergei, he is confident that we can run DAQ at very high
> (>15 kHz, depends on FADC mode). I think it is better to stick with
> nominal number, >10 kHz.
>
> I do not agree and do not like this prescaling based on the electron
> energy. First it will be very uncertain transition region from low to
> high, second it will make almost impossible to have cross section
> measurements. I did not remove it from the document, but I do not think
> we should discuss this option with RG A until more will be known about
> the real trigger rates. Prescaling the whole "loose electron" trigger is
> a different thing. As far I know there is no experiment that needs
> inclusive electron, so if single "loose electron" trigger rate will be
> unacceptable other triggers must be discussed, e.g. two electrons
> mentioned in the document, or e- and a hadron, or e- and a neutral. I
> think this kind of options can be brought at the table and discussed.
>
> Regards, Stepan
>
> On 4/6/17 3:33 PM, Pawel Nadel-Turonski wrote:
>> Charles,
>>
>> Very nice summary! Not sure if we need to include something about
>> limiting the solenoid field to background suppression only. I also have
>> to dig up the polarization number in the DVCS proposal, since we were
>> aiming to be compatible with them.
>>
>> Cheers,
>>
>> 	Pawel
>>
>>
>>> On Apr 6, 2017, at 10:28 AM, Charles Earl Hyde <hyde at jlab.org> wrote:
>>>
>>> Pawel, Stepan, et al
>>> Here is my summary of the Run Group A requirements for  TCS/J-Psi
>>> from this morning's meeting.
>>> I think it will be important to send a version of this (probably marked
>>> preliminary)
>>> to all RGA spokespersons before the first RGA meeting, possibly
>>> scheduled for
>>> next week.
>>>
>>> Revisions and additions are welcome  (maybe some of my editorial
>>> comments
>>> should be removed from the request we send to RGA).
>>> I think it will be helpful to be as specific/quantitative as possible,
>>> even if many things
>>> are uncertain and most will be subject to collaborative negotiation.
>>>
>>> Charles E. Hyde
>>> University Professor of Physics
>>> Old Dominion University
>>> www.odu.edu/~chyde<TCS-RG-A.docx>
>>
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