sPHENIX discussion of the superconducting solenoid

["Yip, Kin" <kinyip AT bnl.gov>]

Hi,

 

I’ve just checked and chatted with the Cryo Control Room.   Cryo Control Room started to boil off He ever since I called them around 6:33 pm.

 

I attach a plot of the temperature sensors closest to the magnet coils.  The first peak was due to the fast discharge at 1000 A which was about when the boiling off started.

The Helium in the reservoir(s) (at the upper platform) was first boiled whereas Helium in the Solenoid Magnet around the coil was about the last to be boiled off.   As you

can see from the plot, around 10 pm, as the boiling-off process was near the end, i.e. no more Helium around, the temperature of the magnet coil finally started to rise.  

In the plots, both sensors were already > 10 K.

 

Kin

 

From: Mills, James A <mills AT bnl.gov>
Sent: Monday, November 14, 2022 8:29 PM
To: Yip, Kin <kinyip AT bnl.gov>; Steinhauff, Adrian <steinhauff AT bnl.gov>
Cc: Michnoff, Robert J <michnoff AT bnl.gov>; Walker, Ronald <rwalker AT bnl.gov>; Albanese, Marianna <malbanese AT bnl.gov>; Morris, John <jtm AT bnl.gov>; Feder, Russell <rfeder AT bnl.gov>; Toldo, Frank A <fatoldo AT bnl.gov>; Haggerty, John <haggerty AT bnl.gov>
Subject: RE: [Sphenix-magnet-l] Pablo's test completed ... Cryo can warm up 1008

 

Great, thanks Kin.  Adrian, when you get the go-ahead to remove the ODH signage (do we want to just cover them, since we will need to put them back up in a few months?  I am not sure what the protocol is), would you let us know?  Thanks so much.  Have a nice evening and see you all tomorrow.

 

Best regards,

Jim

 

From: sPHENIX-magnet-l <sphenix-magnet-l-bounces AT lists.bnl.gov> On Behalf Of Yip, Kin
Sent: Monday, November 14, 2022 6:41 PM
To: sphenix-magnet-l AT lists.bnl.gov
Cc: Michnoff, Robert J <michnoff AT bnl.gov>; Walker, Ronald <rwalker AT bnl.gov>; Albanese, Marianna <malbanese AT bnl.gov>; Morris, John <jtm AT bnl.gov>; Steinhauff, Adrian <steinhauff AT bnl.gov>
Subject: [Sphenix-magnet-l] Pablo's test completed ... Cryo can warm up 1008

 

Hi,

 

Pablo Rosas' test has just completed.  ( We opened the contactors of dump resistor in 1008 so that we could go home 30+ minutes earlier. )   Today, Pablo didn't really work on "compensation" or change regulation.  He and his team have taken a lot 

of data for currents/voltages for the Power Supply and the Regulator, using his precise meter and a different logger, not found

in the data kept in LogView (which are routed through our quench-detector data chain and the PSI-ramp-control data chain).

Pablo cares more about the Power Supply information than most of us.

 

I've just informed the Cryo Control Room (and  I discussed with Roberto about the timing a few hours ago).  So, Cryo will shut the valve in 1008 to stop He supply from the RHIC ring and boil off the remaining He in 1008.  As a result, tomorrow Adrian Steinhauff can take off the ODH sign for 1008 --- we have discussed a couple times about this.    ( Roberto told me that for warming half of the RHIC ring, they'll do it up tomorrow as it requires 3 of them with a bit more works. )

 

Ron Walker is the one who has been baby-sitting the Power Supply in 1008B for the last several hours and he's also the on-duty CAS member tomorrow morning (from 5:30 am onwards).  He'll help Frank Toldo do the LOTO's to open the pole-tip doors tomorrow morning.

 

Kin

 

Attachment: tmpPrintEmailDbyr4L.gif
Description: tmpPrintEmailDbyr4L.gif