[Halld] Commissioning status - restart on Saturday

[Eugene Chudakov]

At 7:30 the hall is still in control access.
The shift is on standby till 10:00.

Eugene

On Fri, 31 Oct 2014, Eugene Chudakov wrote:

> The accelerator is recovering. The current plan is to start locking
> the halls after 15:00 and run the electron beam during the swing and
> night shifts into the tagger hall. We may be able to start our photon
> beam operations at 8:00 Saturday.
>
> The appropriate shift crew should come by 8:00 on Saturday, Nov 1.
>
> A few technical details:
>
> The accelerator has two problems with one of the cryomodules in the
> South linac: a stuck JT valve and a poor insulation vacuum. They
> disconnected this module and will run without it. The current plan is
> to keep the same energy per pass. In order to keep the energy they
> increased the gradient in the remaining cavities, potentially
> increasing the trip rate. They already tried to run without a beam -
> the trip rate looked acceptable. Repairing of the cryomodule will have
> a lower priority.
>
> For the run coordinator,
> Eugene
>
> ------------------------------------------------------
> Eugene Chudakov
> phone (757) 269 6959  fax (757) 269 6331
> Thomas Jefferson National Accelerator Facility
> 12000 Jefferson Ave, STE 4,
> Newport News, VA 23606 USA
>