[b1_ana] Fwd: PR12-13-011

[Elena Long]

Good afternoon,

The tech note has been updated. In particular, Eq.s 8 and 9 demonstrate 
the reduction of terms by having an unpolarized beam.

http://nuclear.unh.edu/~elong/analysis_files/2013-05-24/b1_extra_asyms.pdf 
<http://nuclear.unh.edu/%7Eelong/analysis_files/2013-05-24/b1_extra_asyms.pdf>

Do we have an estimate of the size and uncertainties on each of the 
asymmetries that we're going to have to deal with if the beam is 
polarized? I can include those in the note as well.

Take care,
Ellie

Elena Long, Ph.D.
Post Doctoral Research Associate
University of New Hampshire
elena.long at unh.edu
ellie at jlab.org
http://nuclear.unh.edu/~elong
(603) 862-1962

On 05/24/2013 03:20 PM, Elena Long wrote:
> Good afternoon,
>
> With Pb=0, we'd be left with just the 1/2*Pzz*Azz and Pz*A_V^d terms,
> correct? I'll update the end of the tech note to include the Pb=0 terms.
>
> By the way, if anyone needs access to the *.tex it's available in the
> same folder as the tech note, just delete the "pdf" in the URL and
> replace it with "tex"
>
> Take care,
> Ellie
>
> Elena Long, Ph.D.
> Post Doctoral Research Associate
> University of New Hampshire
> elena.long at unh.edu
> ellie at jlab.org
> http://nuclear.unh.edu/~elong
> (603) 862-1962
>
> On Fri 24 May 2013 03:07:34 PM EDT, O. A. Rondon wrote:
>> Hi Karl,
>>
>> Thank you for forwarding the info. That is what I asked about the laser
>> light. I think we should ask for it.
>>
>> One thing I would suggest we could do at the presentation is to show a
>> slide with all the asymmetries that Ellie has collected, and then follow
>> it with the same slide, but with P_b = 0, to show the enormous
>> simplification. It could be compelling, especially since we only want <
>> 200 nA.
>>
>> Cheers,
>>
>> Oscar
>>
>> Karl Slifer wrote:
>>> ---------- Forwarded message ----------
>>> From: *Jay Benesch*
>>> Date: Friday, May 24, 2013
>>> Subject: PR12-13-011
>>> To: Karl Slifer <karl.slifer at unh.edu>
>>> Cc: marcy at jlab.org, hansknec at jlab.org
>>>
>>>
>>> Karl,
>>>
>>> I was wrong.  I just spoke with Marcy.  Linearly polarized red light on the
>>> existing cathode would give you unpolarized electrons.  All one would have
>>> to do is remove the unit that turns linear to circular polarization.
>>>    Unfortunately, this is done on all three laser beams with the same unit so
>>> all halls would have to agree.  I couldn't reach John Hansknecht to learn
>>> whether there's enough room to rebuild the laser table to allow the hall C
>>> beam to bypass the unit while getting to the cathode at the right time.  I
>>> doubt it, but John does extraordinary things.
>>>
>>> The gun group is also working with another cathode with high QE in green
>>> light and no polarization but there is some valid reluctance to put it in
>>> the CEBAF production injector due to "volatility" (my word - the stuff can
>>> move within the chamber if too much light gets to it).  It needs to stay in
>>> vacuum so it can't be installed in the old gun.
>>>
>>> Jay
>>>
>>>
>>>
>>>
>>>
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>>>
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