[Halld] Status of the run

[Eugene Chudakov]

Update from the today's 8:00 MCC meeting:

a) The option of running with the single transformer is off the table.
The oil probe from this transformer showed signs of degradation of the
insulation.

b) The Arne's time estimate: accelerator start by Mar 26, a few
days needed for tuning, about 1 week of hall operations before Apr 6.

c) A plan to run at 1 GeV/pass will be considered. Such a run may start
by the end of the next week. I am not aware of PAC-approved beam time
at this energy.

Eugene

On Wed, 7 Mar 2018, Eugene Chudakov wrote:

> You might have already heard or read in the JLab Communication about
> the run status. Let me repeat what we heard at 1:30 MCC meeting. On
> Monday one of the 2 transformers supporting the CHL-1 failed. No other
> damage has been detected. The CHL-1 is at 4K now.  Potentially, a
> single transformer may be able to support steady running at 2K. It is
> unclear that it could support transients.
>
> Two scenarios are considered:
>
> - A quick (1 week?) recovery using the single transformer. Tests are
> planned for this Friday or so. However, it is considered a risky path,
> not very likely to be taken.
>
> - Procurement and installation of 2 new transformers (perhaps, getting
> ready to deliver beam by Mar 23). This activity is under way.
>
> The run can be extended till Apr 6 without a great stress to the Lab's
> budget. Running beyond that date would change considerably the
> electric bill.
>
> Meanwhile, Hall D is in restricted access. The solenoid is ramping
> down.
>
> Eugene
>
>