[b1_ana] Fwd: Independent Technical Advisory Report

[O. A. Rondon]

I really don't understand what is their hang up with the target
thickness. It should be very clear from the proposal that we are not
going to average multiple unpolarized periods into one big set. Each
pol. - unpol. difference is an independent measurement.

Even if the errors are "instrumental", like the pf., multiple
measurements can be averaged and the error of the mean is the error of
each divided by the sqrt of the number of cycles. And we only care about
the error of each measurement. Of course, we can lose half the target
load from beginning to end. We'd have half the rates at the end, but
what matters is the Azz we get at each period.

It's like objecting to taking data with two cups. Why would it be wrong
to average the data from each cup?

Also, where do they get this story about the anneals causing loss of
material? The only experiments that had high beam current that could
lead to that kind of issue were RSS, SANE and GEn. As I said in an
earlier email, the only instance of sudden polarization change at JLab
was seen in SANE (once).

But even if the material rearranges itself, and the calibration
constant, etc. changes, that is irrelevant. The next pol. - unpol. cycle
will depend ONLY on the changes from the 10 h of pol. data to the 10 h
of unpol. data, for EACH cup.

Cheers,

Oscar

Karl Slifer wrote:
> A more pessimistic read by the iTAC.
> 
> -Karl
> 
> 
> 
> 
> ---------- Forwarded message ----------
> From: Susan Brown <sbrown at jlab.org>
> Date: Thu, May 30, 2013 at 12:23 PM
> Subject: Independent Technical Advisory Report
> To: Karl Slifer <karl.slifer at unh.edu>
> 
> 
> Dear Dr. Slifer,
> 
> Attached please find a copy of the Independent Technical Advisory report
> for your PAC submission.
> 
> Cheers,
> 
> Susan
> 
> 
> 
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