sPHENIX discussion of the superconducting solenoid

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

Hi,

 

I talked with Roberto.  He’s made his statements because he thought they did the survey last time when we had vacuum …

 

But the survey group actually did the survey before we lifted the Cryostat into the Steel Box.  And also, even when we

first “dropped” the Cryostat to the Steel Box, the Control Positions weren’t really different from when we were in the

yellow frame.

 

Kin

 

From: Than, Yatming (Roberto)
Sent: Wednesday, September 13, 2017 4:41 PM
To: Yip, Kin <kinyip AT bnl.gov>; sphenix-magnet-l AT lists.bnl.gov
Subject: RE: Brief Summary of the sPHENIX Biweekly Meeting (Sept. 13, 2017) in the 902 conference room

 

It may still be conceivable that the vacuum forces can help with the shape.

 

The weight of the coil is around 30,000 lbs??

The vacuum forces on the outer jacket wall is force pushing inward. These are in the 600,000 lbs-force range

The vacuum forces on the inner diameter wall is force pushing outward. These are in the 500,000 lbs-force range?

 

 

 

 

 

 

Roberto Than

Cryogenic Systems, Collider-Accelerator Department
Brookhaven National Laboratory
Building 1005S, MS 1005S, Room 212
Upton, NY 11973-5000
Telephone: (631) 344-7165
Cell 631-487-6842 
E-mail: ythan AT bnl.gov

 

From: sPHENIX-magnet-l [mailto:sphenix-magnet-l-bounces AT lists.bnl.gov] On Behalf Of Yip, Kin
Sent: Wednesday, September 13, 2017 4:31 PM
To: sphenix-magnet-l AT lists.bnl.gov
Subject: [Sphenix-magnet-l] Brief Summary of the sPHENIX Biweekly Meeting (Sept. 13, 2017) in the 902 conference room

 

Agenda/powerpoint :  https://indico.bnl.gov/conferenceDisplay.py?confId=3573

 

This time, there

 

1.      Naturally, we first discussed about the Magnet misalignment issue.  If one looks at Matt Ilardo’s PDF file, one may see that for the last control position on the Cryostat,
comparing when the cryostat is on the floor on the yellow frame and now (after we tried to give some vertical clearance for the Extension pipe) on Aug. 29, there

are differences > 0.1 in on the horizontal and vertical positions (giving rise to a total of ~0.1553 inches in magnitude).  There was almost no such difference

for these Control positions before we tried to raise the Cryostat vertically on Aug. 29.

Dave Phillips and Jon Hock are worried that the Cyrostat may be twisted and since everything is connected, the flange or even the coil can be affected.  It might be worse after cool-down.   It’s decided to try to raise it and put it down again.   Jon Hock was talking about using a swivel jack (hydraulic) but after the meeting, they went back to the original proposal of building a saddle to raise the Cryostat and then put it down.   It may take a week or two before the staircase/wooden-platform can be completed and we

hope to use this period to do this.

2.      We then discussed about various status:
(i) The Facility & Expt. Support Group has got approval to use OverTime to ask the carpenters to build the staircase/platform whenever they can.  Hopefully, it’ll star this week and finish next week.

(ii) J. Benante told me on Monday (Sept. 11) that his team pulled network cable for us using a high/difficult route from the north side door to the present Cryo rack.  Bill Eisele has installed the network switch on Tuesday (Sept. 12).

(iii) Carl Schultheiss has reported that they have finished wiring the front-end chassis and is now moving things to the rack whereas C. Theisen has written the software and waited for Zeynap to make the finishing touches.   Carl has also purchased the capacitor of the snubber circuit and he’ll talk with P. Rosas

3.      Dave suggested checking the vacuum after we have the first level platform but it seems that this might take too much time/effort.   We’ve opted to do the vacuum check after the Valvebox is connected as we normally would do.

4.      Diane Hatton talked with me yesterday (Sept. 12) at 1:30 pm and she’s asked for some manpower information from Oct. 1 onwards for this High-Field Test.   Though I told her that by the time she gathers her nos., we might have finished our test, she still thinks that she’s helping us by getting the manpower resource that we need.   Anyway, I made up a list after talking with Roberto Than (Cryo), Carl Schultheiss, D. Phillips and showed it during the meeting.   Dave pointed out the works by P. Rosas and also pulling the 535 MCM cables (40 of them).   So, I’ll modify/update and send around the list.   Diana will come to my office next Monday.