sPHENIX discussion of the superconducting solenoid

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

Hi,

 

We were hoping >~ 50 MOhm so that the leakage current would be <~ 10 micro-amp (at ~520 V).   Now, it seems to be roughly ~500 micro-amp

(if we put in 520 V or so).

 

Kin

 

From: Edward O'Brien <eobrien AT bnl.gov>
Sent: Wednesday, October 5, 2022 2:40 PM
To: Yip, Kin <kinyip AT bnl.gov>; sphenix-magnet-l AT lists.bnl.gov
Cc: Michnoff, Robert J <michnoff AT bnl.gov>
Subject: Re: [Sphenix-magnet-l] water-cooled-bus to ground

 

    Hi Kin,
     Thanks for the update. By the way, what resistance
     were you expecting for the water cooled bus?

    Ed

On 10/5/22 2:04 PM, Yip, Kin wrote:

Hi,

 

The original plan was do a hipot for the water-cooled-buses.

This morning (around 11 am or so), Carl Schultheiss and Pablo Rosas found that there is about 1 Mohm resistance from the water-cooled-buses to ground.    To make sure that it’s the water-cooled-buses

but not our Dump Resistor, they disconnected the MCM cables from the Dump Resistor which took like an hour.  After that, they were able to measure that it’s “opened” to ground for the Dump Resistor but they

measured about 4 MOhm from one water-cooled-bus to ground and about 2 MOhm for 3 other water-cooled-buses.

 

Carl and Pablo are thinking whether we can live with these.  They’ll try to measure them again in a dry weather tomorrow.   There is a chance that they may want to disconnect the water-cooled-buses

at the West Wall to measure.

 

In the mean time,  Larry Vogt is circulating his water system without going to our sPHENIX Magnet Power Supply and the water-cooled-buses.  Pablo wants the water to circulate overnight before getting into

his Power Supply so that we will have cleaner water tomorrow morning (for the Power Supply).

 

Kin

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