<div dir="ltr"><div>Hi Dustin,</div><div><br></div>Lets put aside the actual method for a moment, and discuss the technique later, if this is fruitful.... <div><br></div><div>My basic question is : if we flipped 10 times a day and ran each point for 10 days, that gives 100 "buckets" or "slugs" of data. So I think a 1% (or 10^-2) drift over this 10 days would be suppresed to a 10^(-3) effect. This is difficult, but I think doable. Or do we need to have a 1000 slugs in order to reduce to 10^-4?<div>
<br></div><div>-Karl</div></div><div class="gmail_extra"><br clear="all"><div><br><div><div>
</div></div></div>
<br><br><div class="gmail_quote">On Sat, May 4, 2013 at 8:19 PM, Dustin Keller <<a href="mailto:dustin@jlab.org">dustin@jlab.org</a>> wrote:<br><blockquote class="gmail_quote">
Hi,<br>
<br>
It is possible to use an additional loop to annihilate polarization, it is<br>
similar to AFP, but different, not needing to go to negative polarization.<br>
This would require an additional loop most likely on the outside of the<br>
cup.<br>
<font color="#888888"><br>
dustin<br>
</font><div><div><br>
On Sat, 4 May 2013, Karl Slifer wrote:<br>
<br>
> PPS : please note that in the overhead I assumed we would switch<br>
> polarization states twice per day and I assumed 2 hours each time. I think<br>
> this would imply about 10 "buckets" of polarized counts and 10 "buckets" of<br>
> unpolarized counts for each of our 3 x-points. It is our dominant<br>
> overhead at 5 days total.<br>
><br>
> I think we may have a little room to move here. Please see the attached<br>
> plot from g2p data, where we depolarized the (proton) target by pumping<br>
> with microwaves in less than 4 minutes. The pump up is also very fast with<br>
> the new fridge and blasting the wattage of the new microwave cavity the<br>
> pump up is about 30 mins to the negative state. I think polarizing in the<br>
> positive state is usually a little faster.<br>
><br>
> So, perhaps we can be a little more aggressive in our overhead estimate :5<br>
> or 10 mins for depolarizing and 30 mins to polarize. That would give us<br>
> the flexibility to increase the number of "buckets" to say 10 or 12 total<br>
> per day. It will be a large overhead (about 12 days just for this), but oh<br>
> well. Would this be sufficient to control the known drifts?<br>
><br>
> A little more radical would be to explore the idea of flipping from<br>
> positive to negative tensor polarization rapidly with an AFP type flip,<br>
> which I believe is near instantaneous. This is essentially what happens<br>
> with hole burning anyway I think.<br>
><br>
> -Karl<br>
><br>
><br>
><br>
> ---<br>
> Karl J. Slifer<br>
> Assistant Professor<br>
> University of New Hampshire<br>
> Telephone : <a href="tel:603-722-0695">603-722-0695</a><br>
><br>
><br>
> On Sat, May 4, 2013 at 6:47 PM, Karl Slifer <<a href="mailto:karl.slifer@unh.edu">karl.slifer@unh.edu</a>> wrote:<br>
><br>
>><br>
>> Hi All,<br>
>><br>
>> I've posted the updated draft at<br>
>><br>
>> <a href="https://dl.dropboxusercontent.com/u/59933793/tensor_b1_v03.pdf">https://dl.dropboxusercontent.com/u/59933793/tensor_b1_v03.pdf</a><br>
>><br>
>> There is some lagtime for implementation, but I think this reflects pretty<br>
>> well where our discussion was about 24 hours ago. However, we still need:<br>
>><br>
>> -updated rates/kin plots from Ellie or Patricia and values for the table<br>
>><br>
>> -some consensus on how to address Steve's comments.<br>
>><br>
>> It seems we have three options with time running short.<br>
>><br>
>> 1) List all possible factors that drift with time and atleast sketch a<br>
>> plan to deal with them.<br>
>><br>
>> 2) go back to difference of counts.<br>
>><br>
>> 3) Cancel submission and work on this for next PAC.<br>
>><br>
>> I lean to the first, Oscar leans to the second. I'd very much like to<br>
>> find some consensus on this. Am I the only one still nerding it up in<br>
>> front of my computer on this beautiful spring day?<br>
>><br>
>> -Karl<br>
>><br>
>> PS : If anyone makes suggestions for changes I would very much appreciate<br>
>> that they be in a form that I can put into the document quickly.<br>
>><br>
>> ---<br>
>> Karl J. Slifer<br>
>> Assistant Professor<br>
>> University of New Hampshire<br>
>> Telephone : <a href="tel:603-722-0695">603-722-0695</a><br>
>><br>
><br>
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