sPHENIX discussion of the superconducting solenoid

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

Hello,

 

Thanks for the confirmation 😊  ( I feel like passing an exam. or something 😁 )

 

I hope Chung help re-configure as soon as he comes back on Tuesday.

 

Kin

 

From: Schultheiss, Carl <carls AT bnl.gov>
Sent: Friday, September 2, 2022 9:20 AM
To: Yip, Kin <kinyip AT bnl.gov>
Cc: Ho, Chung <chungh AT bnl.gov>; Theisen, Charles <ctheisen AT bnl.gov>
Subject: RE: "-90 Off Jnt" to be "resurrected" ...

 

I have to go through it myself, it looks correct. I think Chung is out today,

I will be in Tuesday. I picked up the equipment we need

to input “50 Amps” and enable the interlock.

 

Chung should reconfigure before we do the calibration.

 

Carl

 

From: Yip, Kin <kinyip AT bnl.gov>
Sent: Friday, September 2, 2022 9:09 AM
To: Schultheiss, Carl <carls AT bnl.gov>
Cc: Ho, Chung <chungh AT bnl.gov>; Theisen, Charles <ctheisen AT bnl.gov>
Subject: "-90 Off Jnt" to be "resurrected" ...

 

Hi Carl and Chung,

 

I figure out the answer, I think.

 

The voltage diagram (which we copy from document to document … Carl still hasn’t put in the spares that we’ve added) can be found in the 2^nd page of the plan:  2022 Magnet Operation Plan.docx

 

VT11 and VT10 gave us problem (or whatever you’d call it) in the high-field test.

 

VT10 is the one that we can’t fixed as it’s inside the Magnet Cryostat.   We add replacement(s) for VT11.

 

I looked at the (old) assignment :

2017-12-28 SG Channel Assignment.xlsx

 

VT-10 -> VT-11 used to be called “Negative Magnet Lead”

and

VT-11 -> VT-20 is called “Negative 90 deg. Offset Joint”

 

We obviously did VT9 – VT20 in 2018 (at the end) --- bypassing VT10 and VT11.

( VT9-VT20 must be “Inner Magnet Coil; Negative”. )

 

Now, we need to do VT9-VT11  and VT11-VT20.

 

So, I think we need to change VT9-VT20 to VT9-VT11, which we call “Inner Magnet Coil; Negative” or  “Inner Coil Volt” in the Labview panel ;

 

and we need to have VT11-VT20 , “Negative 90 deg. Offset Joint” or “-90 Off Jnt” in the Labview panel.

 

Carl, do you agree ?

 

Kin

 

From: Yip, Kin
Sent: Friday, September 2, 2022 8:29 AM
To: Schultheiss, Carl <carls AT bnl.gov>
Cc: Ho, Chung <chungh AT bnl.gov>; Theisen, Charles <ctheisen AT bnl.gov>
Subject: Which one of the two should be re-enabled ?

 

Hi Carl,

 

Can you please tell us which of the two channels should be re-enabled ?  So that Chung can try to re-enable/reconfigure it.

 

Kin

 

 

 

-------- Original message --------

From: "Schultheiss, Carl" <carls AT bnl.gov>

Date: 9/2/22 8:04 AM (GMT-05:00)

To: "Yip, Kin" <kinyip AT bnl.gov>

Cc: "Theisen, Charles" <ctheisen AT bnl.gov>, "Ho, Chung" <chungh AT bnl.gov>

Subject: RE: Chung Ho can disable/ignore any voltage tap

 

You don’t “ignore” a voltage tap. You have to have the

channel (each made up of two taps) reconfigured to look

at different taps. It is somewhat more complicated than

you believe.

He can practice by fixing the channel associated with the voltage tap

we fixed. Right now two channels are “disabled” on the front display,

the correct one can be reconfigured to its original condition and

that channel must be reenabled.

 

Carl

 

 

From: Yip, Kin <kinyip AT bnl.gov>
Sent: Thursday, September 1, 2022 9:18 PM
To: Schultheiss, Carl <carls AT bnl.gov>
Subject: Chung Ho can disable/ignore any voltage tap

 

Hi Carl,

 

Just remember …

 

Today, I talked with Chung Ho and Charlie Theisen (separately) about the possibility of disabling or ignoring a voltage tap if we later found that a voltage tap is no good (etc.).

Both Charlie and Chung are confident that Chung can do this 😊

 

Kin