sPHENIX discussion of the superconducting solenoid

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

Hi,

 

1.      Below are two messages that I’ve received from Gregory Heppner (who deals with all the voltage tap wiring right on the superconducting busin RHIC)  and Leonard Masi Jr.    Gregory’s procedure uses a lot of stuff, Nomek, Kapton, … glass tape J

Leonard and also Tom Tallerico have pointed out that actually Tefzel doesn’t specify that it could deal with 4K but in his message/example, it’s -65 C,

only slightly higher than PVC.

 

Paul Giannotti showed me the wires/cables in the chimney in 912 at the bottom of the ValveBox.  I’ve taken a picture which shows the flat-ribbon

cable ---- which is PVC ----  left from the BaBar era and we’ve been still using it during the low-field test J   

 

Now it’s like “Piyush/Schultheiss/Lambiase” vs “Cryo group”/Giannotti  J   I wonder whether Piyush/Sonny can just use their favorite Kapton/Tefzel for

connecting the voltage taps  and the Cryo group and Paul Giannotti use the Teflon with PVC jacket for hundreds of those signals of the temperature sensors, strain gauge etc.

 

We can discuss it in this Wed.’s meeting.

 

 

2.      Ray Ceruti showed me that there is really NO insulation (no MLT) between the ~4K superconducting bus and our signal cables (voltage taps, temperature sensors, strain gauge).   Only a couple inches of vacuum is the separation.    So, those cables can be really cold.

From Ray, I’ve heard that there are a lot of vacuum leaks for the new junction-box/doghouses.  They’ve had to ask the welders to come back 4 times to

fix the vacuum.   Now, it’s at 10^(-9) level --- good !    But apparently, the Cryo Extension won’t be finished this month L J   It probably would need

another month.   Ray and his colleagues have worked for 1.5 weeks for the Cryo Extension and stopped a bit for other business.  But they’ll come back

to work this Extension this week again.

 

Kin

 

 

=====================================  From L. Masi Jr. ===================================

 

Gentlemen, if you look at the specifications for PVC and Tefzel you’ll see there is only a 10 degree difference ( 218k-208k),considering the coil was built with PVC ribbon cable and is stationary this should not be an issue. If this is unacceptable then you may want to consider kapton insulated wire which can get you down to 4k but may be difficult to work with.

                                                                                                                Respectfully Leonard Masi

MIL-W-22759/16 Tefzel® Insulated Wire

• MIL-W-22759/16 Tefzel® Insulated Wire

Description: Printed Tefzel® insulated hook-up wire, conforming to MIL-W-22759/16 in AWG sizes 24-00 in the strandings specified.
Specification: MIL-W-22759/16.
Conductor: Stranded tinned copper.
Insulation: Extruded EFTE.
Temperature rating: -65°c to 150°c.
Voltage rating: 600 volts R.M.S.
Standard spool put-up: 1000 ft.

 

PVC Insulated Wire

Description: Thin wall general purpose electronic hook-up wire. Resistant to water, oil, acids, solvents & fungus. Flame retarded.

Mil. Spec. No.: MIL-W-16878/1.

Conductor: Stranded or solid tinned copper.

Insulation: PVC .010″.

Temperature Rating: -55°c to 105°c.

Voltage Rating: 600 Volts R.M.S

Standard spool put-up: 1000 Ft., 5000 Ft.

Ordering Information:

===================================================================================================

 

==================================== From Gregory Heppner ==========================================

As requested,

 

Materials used when joining two Superconducting magnets together in the RHIC Tunnel.  Note: Most of these materials can be found in the Magnet Division and possible Scott Seberg has some left over kits in his inventory. 

 

1)    Solid Silver Solder used with special paste flux

2)    Copper tubes to crimp splice and solder the Blue 450 amp Superconducting QB Trim Buss

3)    Nomex of various shapes, sizes and thickness

4)    Kapton Tape of various sizes and thickness

5)    Tefzel Shrink to prevent Kapton Tape from unraveling

6)    Glass Tape

7)    Kevlar String to secure Glass Tape

8)      5 Minute Epoxy to secure Kevlar Knots

 

Thanks,

 

Gregory P. Heppner

 

 

 

From: Kin Yip [mailto:kinyip AT bnl.gov]
Sent: Monday, January 30, 2017 10:15 AM
To: sphenix-magnet-l AT lists.bnl.gov
Subject: Buying TEFZEL jacket ($3400)

 

Hi,

Tom Tallerico comes to talk with me and I told him that the temperature can be close to 4K ... 20K or whatever is bad enough !
Tom showed me the quote for TEFZEL that he's got ...it's like $3.99 per feet (if I remember it correctly).   So, the total would
be ~$3400.   He's making the purchase order now.

I've attached the documents that Bob sent me,
concerning the problematic pigment called "Phtalocyanine pigment" in the green TEZFEL cables which seem to have broken.

I'm asking Tom to make sure that we don't have this "Phtalocyanine pigment" in the TEZFEL jacket that we're buying.

Kin

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

Subject:	Fwd: Tefzel
Date:	Mon, 30 Jan 2017 10:08:16 -0500
From:	Kin Yip <kinyip AT bnl.gov>
To:	Tallerico, Thomas N <tallerico AT bnl.gov>
CC:	Giannotti, Paul <gia AT bnl.gov>

Hi Tom,

Can you send us the Tefzel specification that you've got ?

Attached are the documents (from Bob Lambiase) concerning the problematic pigment called "Phtalocyanine pigment" in the
green TEZFEL cables which seem to have broken.

Can you please make sure that there is NO such thing in the TEZFEL cable that you're going to buy ?

Kin

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

Subject:	Tefzel
Date:	Fri, 27 Jan 2017 10:58:28 -0500
From:	Lambiase, Robert <lambiase AT bnl.gov>
To:	Yip, Kin <kinyip AT bnl.gov>

Hi Kin,

 

I was doing too many things at once yesterday.

 

Here’s the original attachment, Chromatics.pdf, that I wanted to send plus a picture of the cable with green Tefzel after cold tests.

 

Bob

 

---------

 

Hi Kin,

 

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.  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.

 

Bob

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