sPHENIX discussion of the superconducting solenoid

["Mills, James A" <mills AT bnl.gov>]

Nice job guys.  Thank you!

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From: sPHENIX-magnet-l <sphenix-magnet-l-bounces AT lists.bnl.gov> on behalf of Yip, Kin <kinyip AT bnl.gov>
Sent: Sunday, October 23, 2022 4:00:38 PM
To: sphenix-magnet-l AT lists.bnl.gov <sphenix-magnet-l AT lists.bnl.gov>
Cc: Michnoff, Robert J <michnoff AT bnl.gov>; Albanese, Marianna <malbanese AT bnl.gov>
Subject: [Sphenix-magnet-l] Hipot Done today ... Carl request that you don't go above 500 amp before he's in BNL

 

Hi Pablo,

Sorry for the previous incomplete message.

Early in the morning, because of some doubt of Carl (after reading the new/temporary LOTO instructions attached to that box to go up to the platform), I called Eric Johanssen and he agreed that we could do the hipot as we planned. ( I also talked with Joel and Tom. )

It took Carl a while (in both 1008 platform and 1008B) to understand what he measured by fluke meter.  Carl forgot he put a jumper between two voltage taps when the Current Lead voltage taps were not connected.  Carl said that this is why we do hipot 😁

We also asked CAS (Ron Walker) to help disconnect the snubber circuits.

At the end, under the rain, the 520 V hipot (for the entire system) passed with 65 microamp leakage current → ~ 8 Mohm.

I put the switch back to "grounded" in the dump resistor (as I switched it to "ungrounded" for hipot).  I reconnected J6 cable back as I disconnected it earlier.  Ron put the snubbers (and that small relay we took out) back.  So , everything was back to where it was.  Except that I left the contactors in the "opened" state (it was "closed" when I first arrived).

On Monday, Carl has a medical appointment.  He will be at the Lab. around/at 11 am.   

Carl requests:

1. Please don't "force" the quench detector into the "good" state when you do compensation, as everything is real now.  I left it running in good state.

2. Carl asks that you don't go above 500 amp before he comes to BNL .  He wants to check the quench detector (and He gas flow in the Leads).

I hope you can accommodate him 😀

Today, I arrived before 12 pm and now it's almost 4 pm.  Carl was probably here soon after 11 am. 

Kin