[Clas12_rgb] Fwd: deuterium target plans

[Stepan Stepanyan]

Dear Silvia,

I fully support that decision, run RG-B on LD2, no target changes.

Happy holidays.

Best regards, Stepan

> On Dec 21, 2018, at 2:35 PM, Silvia Niccolai <silvia at jlab.org> wrote:
> 
> 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 <mailto:rmiller at jlab.org>>
>> Date: 21 December 2018 at 19:58:09 CET
>> To: Silvia Niccolai <niccolai at ipno.in2p3.fr <mailto:niccolai at ipno.in2p3.fr>>
>> Cc: Stepan Stepanyan <stepanya at jlab.org <mailto:stepanya at jlab.org>>, Volker Burkert <burkert at jlab.org <mailto:burkert at jlab.org>>, "Daniel S. Carman" <carman at jlab.org <mailto: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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