[Halld] Hall D Solenoid Status

[Eugene Chudakov]

After the quench:

The plan is to test the magnet again. The cooldown started yesterday.
The warmest coil - Coil 4 - is at about 36K now. The full cooldown may
take about 10 days.

The first round of testing shows nothing special. The resistances of
the coils and the taps' voltages look normal for the given
temperature.

The details of the test plan will be finalized in the coming week.

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

On Sun, 3 May 2015, Eugene Chudakov wrote:

> After a good start we have a setback.
>
> The solenoid quenched on May 2, at 14:37, after staying for about 24h
> at 1300A. The quench started in the subcoil 4D. At the moment there is
> no indication that it was provoked by anything like a pressure rise or
> a voltage spike. Most of the He was blown out through the relief
> valve. The magnet and the cryo-plant have been "parked" till Monday.
>
> For the rest of the run (1.3 days) we are planning to take more
> straight tracks for the FDC alignment and to continue the trigger/DAQ
> studies.
>
> The next steps will be discussed on Monday.
>
> Regards,
> 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
>