[d2n-analysis-talk] APS talk

[Zein-Eddine Meziani]

Matt,

1-I  have few comments on your talk. They are embedded in the attached  
pdf file.

2-With regard to the target the comment below goes for both your  
backup transparency and Dave's poster.

The generic drawing of the target slide is based on a target that  
never passed 45% polarization.
The 3He polarized double chamber  cell used to be filled with Helium  
and Rubidium was mainly deposited in the upper chamber (pumping  
chamber). The oven heats the upper chamber  for getting Rubidium to a  
vapor state and by controlling the temperature of the chamber we  
controlled the number density of Rubidium atoms in the pumping  
chamber. The temperature in the upper  chamber was typically 180 degC  
and the target chamber about 35 to 40deg C.


The new target uses in the upper chamber an "alloy" of Rubidium and  
Potassium and it is double spin exchange from Rubidium to Potassium  
and then from potassium to He3. It was shown that the double spin  
exchange is faster than a single spin exchange between Rubidium and  
He3. This target has higher performance because of the combination of  
the comet narrow bandwidth lasers and the fast polarization rate that  
even with wall depolarization the net polarization is high, above 50%.  
It also requires an oven that run at higher temperatures 230 degC

The alkali don't get in the cell chamber because it's temperature  is  
below the vapor temperature usually they stick to the neck of the  
transfer tube and in some cases they drip down the target chamber but  
stick at the bottom and are not in the path of the beam. The beam  
crosses He3 and N2 as a buffer gas that quenches radiative transition  
in Rubidium.

Zein-Eddine

On Feb 8, 2010, at 2:56 PM, Brad Sawatzky wrote:

> Hi Matt,
>
> Looks good.
>
> I would suggest adding a second copy of slide 4 that a few descriptive
> 'take-home' points.  You can go to the current slide 4, pause for
> second, and then flip to a slide with the same graphic but the content
> you want your audience to come away with in bullet form.
>
> On slide 10:  Are those plots pedestal subtracted or not?
>
> -- Brad
>
> On Mon, 08 Feb 2010, posik at jlab.org wrote:
>
>> Hi all,
>>
>>   Here is the latest version of my APS talk.
>>
>>   http://jlab.org/~posik/aps_2010.pdf
>>
>> I have now included slides for the Big bite and HRS. Diana is going  
>> to
>> send me a Compton plot later this evening.
>>
>>   One thing that I still need to do is to add the last name of those
>> listed on the last slide.
>>
>>   Comments and suggestions welcomed.
>>
>> Thanks
>> Matt
>>
> -- 
> Brad Sawatzky, PhD <brads at jlab.org>  -<>-  Jefferson Lab / Hall C /  
> C111
>  Ph: 757-269-5947 -<>- Pager: 757-584-5947 -<>- Fax: 757-269-7848
> The most exciting phrase to hear in science, the one that heralds new
>  discoveries, is not "Eureka!" but "That's funny..."   -- Isaac Asimov
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