[Halld] Update on running

[Naomi Jarvis]

Dear Collaborators,

At present there is no pressing need for a run coordination meeting
tomorrow or Sunday, and I propose to cancel these.

Best regards,

Naomi.



On Sat, Sep 22, 2018 at 1:56 PM Thomas Britton <tbritton at jlab.org> wrote:

> Dear collaborators,
>
> As you are all are probably aware, yesterday halld experienced two
> solenoid dumps and overnight the accelerator experienced many hardware
> failures including both horizontal and vertical separators and, to quote
> the PD, "a ton of magnets".  As such, the downtime provided Tim, and crew,
> time to enter the hall to investigate the solenoid power supply (the main
> contact was shown as the first to go in both cases). Tim estimates the time
> it takes to complete repairs to the main contact circuitry will take about
> 2-2.5 hours; this is not guaranteed to solve the problems.  While this work
> was ongoing the accelerator became able to begin sending beam to halld
> again.  The decision was made to back out of the hall, leaving the repairs
> on the "to-do" list.  By about 1pm the accelerator began sending tune beam
> to halld.  The accelerator seem to have experienced more PSS faults and are
> struggling to restore beam again.  The current plan is to establish beam to
> halld and continue our setup !
>  and configuration program, with an eye to utilizing planned downtime
> (still scheduled for Tuesday) to complete repairs to the solenoid PS.  With
> all of this, I don't think a meeting tomorrow (Sunday) makes a lot of sense.
>
> I will keep the collaboration posted on any developments and see everyone
> at 8:45am Monday for our standard meeting.
>
> Thanks,
> Thomas Britton
>
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