[b1_ana] Fwd: Hall C DAQ rates

[Simonetta Liuti]

Hi All,
I can obviously write two sentences ;-)
I will talk more to Dustin about it, just to get a better idea.
Cheers,
Simonetta
 
On Wed, 01 May 2013 17:46:48 -0400
 "O. A. Rondon" <or at virginia.edu> wrote:
>Hi Ellie,
>
>Since we said we'd all take a look at the numbers, I see this for the
>x = 0.1 point, for 12 beam hours:
>
>N = 12*3600*1000Hz = 43.2E6 (using your total rate).
>
>The exact stat. error, based on
>
>f*Azz*Pzz/2 = Np/Nu - 1
>
>so
>
>Azz = 2/(f*Pzz)(Np/Nu - 1)
>
>is
>
>dAzz = 2/(f*Pzz*Nu)*sqrt(Np + (Np/Nu)^2*Nu)
>     ~ 2/(f*Pzz)*sqrt(2/N)
>
>where Np ~ Nu ~ N.
>
>Substituting N above, Pzz = 0.2, f = 0.29 (optimistic, it's more like 0.25)
>
>dAzz = 0.0074
>
>Your plot shows dAzz ~ 0.005, which is consistent with having yet to
>include the sqrt(2) factor.
>
>So I think the times and errors are right, assuming the rates are too.
>
>Cheers,
>
>Oscar
>
>
>Elena Long wrote:
>> Good afternoon,
>> 
>> I think that's not going to be an issue. It looks like our maximum 
>> rates will be below 5kHz. For fixed results, please see 
>> https://hallcweb.jlab.org/wiki/index.php/Elong-13-05-01#Fixed_Rates_Code 
>> which I'll discuss tomorrow. When are we meeting, by the way?
>> 
>> Take care,
>> Ellie
>> 
>
>
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