[Clas12_rgb] Fwd: deuterium target plans

[Silvia Niccolai]

Hello all, 
Here are the news I just received from Bob Miller about his target test. 
I agree with him that we shouldn’t risk changing material half way through the run and getting stuck again, losing precious beamtime. 
Besides, RGA-RGK run until now on proton target, and RGA will run again right after RGB. I think this gives us plenty of data to evaluate neutron efficiency. 
Let me know your comments. 
Happy Christmas to everyone. 
Silvia

Sent from my iPhone

Begin forwarded message:

> From: Bob Miller <rmiller at jlab.org>
> Date: 21 December 2018 at 19:58:09 CET
> To: Silvia Niccolai <niccolai at ipno.in2p3.fr>
> Cc: Stepan Stepanyan <stepanya at jlab.org>, Volker Burkert <burkert at jlab.org>, "Daniel S. Carman" <carman at jlab.org>
> Subject: Re: deuterium target plans
> 
> Hi Silvia,
> 
> I tried to operate the target with D2 yesterday and today and was not successful.  The target software is stuck in one process and will not move forward.
> 
> Therefore we have to wait for support from Denis Bouziat at Saclay.  He is the expert on the system and has diagnostic software that he can run.  I am sure we can get the system operating in January.  However, changing from D2 to H2 and back during an experiment is risky; the target is reliable when we get one configuration working (H2 for example), but whenever the system is shut down, or changes are made, we seem to have issues.
> 
> I have sent an email to Denis asking for support.
> 
> I will keep you informed of the progress when we return in January.
> 
> Regards,
> 
> Bob
> 
> 
> 
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