sPHENIX discussion of the superconducting solenoid

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

Hi,

 

So far, Piyush has told me :

“For cryogenic temperature (4.2K) all instrumentation wires has to be  double insulation with Kapton as inner layer and Tefzel as outer layer.”

 

And Bob Lambiase said:

 

“We’ve successfully used Tefzel in RHIC in almost every case, but we had a problem with one color – green.

 

While the other colors were good, the green insulation cracked severely.

 

Some greens are ok.  While the other colors were good, the green insulation cracked severely.

 

Some greens are ok. I’ll attach the letter Chromatics sent me after we had a discussion on this.

 

This is twenty years ago, so I don’t know if organic pigments are still used. “

 

 

 

Kin

 

From: Joshi, Piyush
Sent: Thursday, January 26, 2017 6:54 PM
To: Yip, Kin <kinyip AT bnl.gov>
Subject: RE: [Sphenix-magnet-l] Can those cable jacket deal with cold temperature ?

 

Kin,

For cryogenic temperature (4.2K) all instrumentation wires has to be  double insulation with Kapton as inner layer and Tefzel as outer layer. When Sonny or anyone from magnet division will do the voltage tap wiring they will use the correct wires so don’t worry and tell Paul, no need to buy those wires we have them.

Regards,

Piyush

 

From: sphenix-magnet-l-bounces AT lists.bnl.gov [mailto:sphenix-magnet-l-bounces AT lists.bnl.gov] On Behalf Of Kin Yip
Sent: Thursday, January 26, 2017 12:04 PM
To: sphenix-magnet-l AT lists.bnl.gov
Cc: Masi Jr, Leonard
Subject: [Sphenix-magnet-l] Can those cable jacket deal with cold temperature ?

 

Hi Paul Giannotti,

I can't find you on the phone ... and so I use email again ...

Carl Schultheiss was just in my office and I showed him (and essentially "forced him" to look at) your cable specification, he wondered whether those
PVC jacket can deal with cold temperature ??!!!

At the bottom of the cable specification that you've sent, it said:

"Temperature range of -35 ° C to + 105 ° C (SR-PVC) and -30 ° C to + 105 ° C (PVC)"

Those cables go through the Extension and though they're not at 4K, they're in the insulating vacuum outside the superconducting bus or so ..., they
must be very cold, much lower than -35 ° C ?!

Carl said maybe TEFZEL stuff can be used ... ??

Kin

-------- Forwarded Message --------

Subject:	Re: cabling settled ?
Date:	Wed, 25 Jan 2017 13:41:08 -0500
From:	Giannotti, Paul <gia AT bnl.gov>
To:	Yip, Kin <kinyip AT bnl.gov>
CC:	Tallerico, Thomas N <tallerico AT bnl.gov>, Masi Jr, Leonard <masi AT bnl.gov>

 

Hi Kin,

 

Yes. I met with the Cryo guys (Tom Tallerico, Len Masi, and Rich Meyer) last week. We decided on a 20 conductor, 22AWG, overall foil shield, PVC jacket cable made by Alpha Wire. See attached manufacturer’s data sheet. They have enough cable in their in house BNL inventory to cover the required extension cables needed to be made. This will involve soldering the ends to new D connectors.

 

Regards,

Paul

 

From: "Yip, Kin" <kinyip AT bnl.gov>
Date: Tuesday, January 24, 2017 at 9:03 PM
To: Paul Giannotti <gia AT bnl.gov>
Subject: cabling settled ?

 

Hi Paul,

 

Have you guys settled on the cables and connectors to use ? 

 

Kin

 

-----Original Appointment-----
From: Giannotti, Paul
Sent: Tuesday, January 24, 2017 8:52 PM
To: Yip, Kin
Subject: Accepted: sPHENIX Magnet biweekly meeting
When: Wednesday, February 01, 2017 1:30 PM-3:00 PM (UTC-05:00) Eastern Time (US & Canada).
Where: Bldg. 902 Conf Rm 63