sPHENIX discussion of the superconducting solenoid

[Kin Yip <kinyip AT bnl.gov>]

Hi Carl,

You're talking about something else.   ( The short can still be a problem. )

Paul and I have changed the mapping because of the new system and I've spent some time worrying about it and

made up the new mapping diagrams for Chris/Tony.   The last line is just to "complete" the circuit, nothing else.

Kin

On 6/15/22 13:36, Schultheiss, Carl wrote:

The reason this was connected this way was because there was a short on the strain gage string. Someone should check to see if the short still exists. It may only be present when the magnet is cold. 
Carl

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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: Wednesday, June 15, 2022 12:14:34 PM
To: Wise, Christopher <cwise AT bnl.gov>; Curcio, Anthony J <curcio AT bnl.gov>
Cc: Paul Giannotti <gpaulman56 AT gmail.com>; sphenix-magnet-l AT lists.bnl.gov <sphenix-magnet-l AT lists.bnl.gov>
Subject: [Sphenix-magnet-l] repositioned the wire connected to the -ve terminal (from the end of 3rd block to the end of 2nd block on the 2nd rail) in 1008B mezzanine

 

Hi,

I just chatted with Chris Wise in Teams to show/explain to him the picture attached.    I think Chris understood but I just send this to the mailing list for the record (in case I forget in 3 years or something).

The last wire/line of the 3rd block on the 2nd rail of the rack in 1008B mezzanine  used to connect to the -ve "terminal" of the
Agilent electronics.   But now, we don't use this 3rd block (but only the 1st and 2nd blocks on that 2nd rail).  This morning, Winston (and I)
just connected the -ve "terminal" of Agilent electronics to the last line/wire of the 2nd block as shown in the picture.

The side where the black wire is connected to is actually on the input side and usually they're for the input wires.  But this last line
is an exception because it's the near the end of the circuit and we need to connect to the -ve terminal of the electronics to "complete the circuit". 

Chris will unplug the old other 15 input wires on this block on the input side and plug in the new wires, but not this black one.  
I think Chris has understood it and I just write this for my own benefit (in 3 years ....).

Kin

-----Original Message-----
From: Yip, Kin
Sent: Monday, June 13, 2022 8:05 PM
To: Wise, Christopher <cwise AT bnl.gov>; Curcio, Anthony J <curcio AT bnl.gov>
Subject: Emailing: TT01 - 05.jpg, Strain Gauges.pdf

Hi Chris,

I just re-send the mappings again.

From the longest strain gauge (52*2) list --- pdf file, it goes to TB-TT-1 (TT01-05.jpg) and then to TB-MPOT1 ("Linear Pot Mapping on the 1008B Mezzanine.jpg").
[ For the strain gauges, GRN wire goes to line 1, BRN wire goes to line 2 ... etc. ]

In all mapping files, the diagrams with  "circles with a line across them" indicate the terminal blocks that you see on the rack on the 1008B mezzanine.

Kin