[Clas12_first_exp] Quantity of data available

[Stepan Stepanyan]

FX,

I do not think you can count 39 days of low luminosity as 20 days of full luminosity. If you look proposal E12-11-005, the low luminosity meant to be x20 lower that the nominal. So, in our estimate we ignored it completely and assumed all in all (inbending+outbending) 100 days of high luminosity, 10^{35} cm^{-2} sec{-1}.

Stepan

> On Oct 10, 2018, at 7:16 AM, Francois-Xavier Girod <fxgirod at jlab.org> wrote:
> 
> Yes, there is some low luminosity in the approved PAC days, and we need to agree on how to include this in our luminosity estimation to show at DNP
> 
> When using 100 days inbending and 20 days outbending, we followed the summary:
> https://www.jlab.org/Hall-B/clas12-web/Hall_B_experiment_run_groups.pdf <https://www.jlab.org/Hall-B/clas12-web/Hall_B_experiment_run_groups.pdf>
> 
> It says
> (1) E12-11-005	requires	lower	luminosity	operation	for	39	days.	Experiment E12-12-001	declared	that 80	days	plus	the	39	days	additional	low	luminosity	days	are	equivalent	to	the	total	of	100	days
> (2) E12-12-001	received	approval	for	additional	20	days	of	running	at	reversed	Torus	polarity
> 
> Also we would like to confirm the numbers 7.9e-3 C for Inbending and 7.1e-3 C for Outbending
> 
> Best regards
> FX
> 
> On Wed, Oct 10, 2018 at 1:09 PM Stepan Stepanyan <stepanya at jlab.org <mailto:stepanya at jlab.org>> wrote:
> FX,
> 
> Yes, this is close enough. I think there is some portion with low luminosity in proposed beam time, accounting which it took me to 2.3%, but it is fine at this level.
> 
> I think everybody should use the same number on their slides.
>  
> Thanks, Stepan
> 
>> On Oct 10, 2018, at 6:58 AM, Francois-Xavier Girod <fxgirod at jlab.org <mailto:fxgirod at jlab.org>> wrote:
>> 
>> Dear Stepan, all
>> 
>> There are the numbers we have
>> 
>> Inbending PAC days: 75 nA x 100 days = 0.648 C
>> Outbending PAC days: 75 nA x 20 days = 0.129 C
>> 
>> Using the numbers from Joseph you quoted above
>> Inbending fraction: 7.9e-3 / 0.648 = 1.2%
>> Outbending fraction: 7.1e-3 / 0.129 = 5.5%
>> Total fraction: 0.015 / 0.7776 = 1.9%
>> 
>> Best regards
>> FX
>> 
>> On Wed, Oct 10, 2018 at 12:40 PM Stepan Stepanyan <stepanya at jlab.org <mailto:stepanya at jlab.org>> wrote:
>> Hello Pierre,
>> 
>> Yesterday at our l+l- meeting Joseph showed accumulated change for intending and outbidding runs that you and him are analyzing. It is ~15 mC, which corresponds to ~2.3% of total experiment charge (100 days with 75 nA). Ask Joseph for details, he used gated Faraday cup readings from data.
>> 
>> Stepan
>> 
>> > On Oct 9, 2018, at 10:02 PM, Raffaella De Vita <Raffaella.Devita at ge.infn.it <mailto:Raffaella.Devita at ge.infn.it>> wrote:
>> > 
>> > Hello Pierre,
>> > I’m cc’ing FX and Will who can provide this information.
>> > Best regards,
>> >       Raffaella
>> > 
>> >> On 09 Oct 2018, at 11:17, Pierre Chatagnon <chatagnon at ipno.in2p3.fr <mailto:chatagnon at ipno.in2p3.fr>> wrote:
>> >> 
>> >> Hello Raffa,
>> >> 
>> >> For the DNP meeting, I would like to include the current percentage of cooked data available now.
>> >> From my estimation using Clas12mon I get around 5% of the total Sping run.
>> >> I have seen other estimations.
>> >> I would like to know if there will be an official number to give at the DNP.
>> >> 
>> >> Thanks in advance
>> >> 
>> >> Cheers 
>> >> Pierre
>> > 
>> > 
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