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

[Stepan Stepanyan]

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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