[Clas12_first_exp] no rc meeting today and plans for Monday

[nick markov]

Dear Mac,
thank you!
Nick.
> On Oct 14, 2018, at 12:07 PM, Mac Mestayer <mestayer at jlab.org> wrote:
> 
> Hello Nick;
> 
> I don't think we (DC group) can make use of B=0 
> and beam=0 runs.  I'm also not quite ready for
> B=0, beam on, alignment runs.  I don't
> know the effect of the solenoid - it will reduce
> background (good) but may destroy our
> beam-vertex constraint (bad).
> 
> So, in summary, we are not ready for B=0 data.
> 
> - Mac
> 
> ----- Original Message -----
> From: "nick markov" <markov at jlab.org>
> To: "clas12 first exp" <clas12_first_exp at jlab.org>
> Cc: "Mac Mestayer" <mestayer at jlab.org>, "Yuri Gotra" <gotra at jlab.org>
> Sent: Sunday, October 14, 2018 11:49:27 AM
> Subject: no rc meeting today and plans for Monday
> 
> Dear All,
> we have been taking data overnight. The beam was not very stable and we have a few issues with the DAQ. 
> The gas supply pressure for DC is still low, but the engineer on call is notified and told he will take care of it.
> On top of that, we took a run with the reduced windows for the DC:
> https://logbooks.jlab.org/entry/3608918
> 
> As of now there is no definitive answer from the MCC on how long the bean studies will take. They have a feeling that it will take less then a full shift. I will let you know as soon as I have an update.
> As for plans for tomorrow, I think there are two possibilities:
> - if downtime will take 4 hours or more, we will rump magnets down and take zero field Forward Carriage cosmic ray runs;
> - if the downtime will be shorter we will not take magnets down and just perform a regular maintenance.
> 
> The question I have to the DC and SVT experts is if they want to do a zero field runs, since if the answer is “yes” and we rump magnets down tomorrow, we can take a zero field data overnight until RF studies in the morning.
> Best regards, Nick.