[b1_ana] Fwd: PR12-13-011

[O. A. Rondon]

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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