sPHENIX discussion of the superconducting solenoid

[Kin Yip <kinyip AT bnl.gov>]

Dear Roberto,

After my STAR shift and before I could take an oscilloscope to check something in the AGS polarimeter, I found Brian in front of my office
door by chance !

Apparently, Brian believes at the ~80% level that the problem is due to some wiring issue ??     Brian told me that there are some
logics which need to be satisfied before the valve can be opened, eg. the roughing pump needs to be "ON" before the turbo pump can
be turned on.  If his system doesn't see the "ON" signal (which seems to be the case), one can't turn on the valve. 
( In another example he gave me: the valve side of the pressure is required to be higher than that of the pump side, if it's not satisfied,
the valve can't be opened either. )

I guess you guys will be trying to figure out whether it's a wiring problem or a logical problem (or both) ???   Any other positive (or
even negative) progress that you may entertain us ???

Yours anxiously waiting for cool-down,

Kin

On 02/16/2016 09:39 AM, Than, Yatming (Roberto) wrote:

We will continue the check out today and figure out what is what.

The vacuum gage readings were not coming in correctly to the PLC, so once we confirm whether it is analog input or PLC code we can fix it.

I will try and switch turbo, turbo A came back down and is spinning at minimum speed, so I will switch to Turbo B.

Roberto

 

 

From: sphenix-magnet-l-bounces AT lists.bnl.gov [mailto:sphenix-magnet-l-bounces AT lists.bnl.gov] On Behalf Of Yip, Kin
Sent: Tuesday, February 16, 2016 9:19 AM
To: sphenix-magnet-l AT lists.bnl.gov
Cc: Van Kuik, Brian
Subject: [Sphenix-magnet-l] still struggling with the PLC problem ... need Brian (OC) to fix

 

Hi,

 

Just try to be a little bit amusing here … I’m not like Donald Trump who may enjoy describing the present situation worse than

it may be so that he may claim he could make a lot of improvements here or there.    But I’m probably like Donald Trump who

is not too shy in pointing out what’s not working ….

 

The Cryo group could turn on turbo pump manual (see below) … but right now, the Cryo group has problem in opening the valves using PLC etc.  The problem is that we need Brian van Kuik to fix this but he’s also an Operation Coordinator in MCR Monday to Friday (from 11 pm to 7 am).  He’s just finished his shift and gone home to sleep (as I just talked with him --- who was at home).    Roberto is trying to get him to help to fix our PLC problem.

 

From what Roberto told me, we need to fix this problem and then Pat Talty can start to check out the control system and then try to cool down …

 

This is the present situation from what I can understand.    I’m sitting in the STAR control room and will check with Roberto from time to time.

More or less, everybody is doing something for RHIC and work on sPHENIX Magnet whenever possible.

 

I guess we’re doing the best that we could … and unlike Donald Trump, I or we have probably done the best that we could at any given

time and I don’t have unused magic to fix the present problem L J

 

Kin

 

From: Yip, Kin
Sent: Saturday, February 13, 2016 5:55 PM
To: Orfin, Paul <porfin AT bnl.gov>
Cc: Than, Yatming (Roberto) <ythan AT bnl.gov>
Subject: RE: sPhenix - vacuum turbo on

 

Hi Paul,

 

Thanks for the news.  I’ve been wondering about the Turbo pump. 

 

You mentioned “A Side Turbo”.   Is it that you still need to turn on “B Side Turbo” ?  And your earlier said that roughing

pump B has been working.   Is it that you’re waiting for the vacuum pressure to come down before you turn on the “B

side Turbo” ?!

 

 

Kin

 

From: Orfin, Paul
Sent: Saturday, February 13, 2016 5:24 PM
To: Yip, Kin <kinyip AT bnl.gov>
Cc: Than, Yatming (Roberto) <ythan AT bnl.gov>
Subject: sPhenix - vacuum turbo on

 

Kin,

 

The A side Turbo is on and the valve box is currently down to the 10^-3 scale.  We will keep it on all weekend to lower the vacuum level further.

 

Also, the helium lines have been pumped and purged for operation.

 

Thank you, Paul Orfin
Cryogenic Systems, Collider-Accelerator Department
Brookhaven National Laboratory
Building 1005S, MS 1005S, Room 220
Upton, NY 11973-5000
Telephone: (631) 344-2899
Fax: (631) 344-3329 
E-mail: porfin AT bnl.gov