sPHENIX discussion of the superconducting solenoid

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

Hello,

(1) I made use of the following telephone nos. of Wes Craddock (a BaBar Engineer, Cryo etc.) that he sent me and called him. 

I asked him whether they did tighten or loosen the tie-rods during the BaBar operation for all those years.  He tried first to explain
to me what those procedures were but eventually, when I clarified my question again, he confirmed to me that during the years of
BaBar operation, each time when they moved the entire BaBar detector (including the Magnet) in an out of the experimental
hall, they did NOT tighten or loosen those tie-rods.   There was no space to do the tightening/loosening, just like us.

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

Kin,

Jan 12 will be fine with me.  I’ll be looking forward to getting an update on the solenoid.

 

Wes

SLAC National Accelerator Laboratory

(650) 926-2264  office

(650) 544-4454  cell
======================

(2) I asked the above question because of the meeting we had (1:30 - 2:40 pm).  The conclusion seems that
we just needed to make sure the movement is smooth and there is no jerky action.  ( They'll put a accelerometer to measure
the motion when they're going to move the shielding block in 1008. )

Not related to the tightening/loosening, Mike Anerella said that he worried more the Valvebox being moved from Assembly Hall
to IR or even up and down.   So, during the meeting, it seems a good idea that we don't install the Valvebox  until  the entire
sPHENIX detector assembly (including the Magnet) is in the IR.


I just chatted with Roberto.   He said that most of the works they plan to do in the Assembly Hall (of 1008) is to connect to the
Valvebox (though there are minor works).   If they can't make the connections to the Valvebox in the Assembly Hall, they'll have
do it in the IR and this would introduce additional DELAY !!!    

That's something that we didn't talk about during our meeting.  And so I bring this up in this email.

Kin

On 11/22/19 9:16 AM, Feder, Russell wrote:

Mike, Kin,

We have some questions for you about access to the Babar magnet cryostat tensioning/stabilizing features. We are working on the design of the two inner structural support rings for sPHENIX.  These are those rings that support the outer HCAL as well as other internal detector structures.  In the sPHENIX assembly sequence the cryostat is lowered into oHCAL sectors 1-13, then the two structural rings are installed and then the remaining oHCAL sectors are installed.  The cryostat is then trapped between the two rings.  This work is taking place in the 1008 assembly hall. sPHENIX will be pushed on the tracks into the IR before the magnet is cooled and powered.  We want to make sure we are providing access to the Babar magnet stabilizing features through the structural rings. 

1. When the Babar magnet is transported from 912 to 1008 the tangential and axial stabilizers will be tight.  When is the next time the stabilizing features will be untightened?  Can we loosen the stabilizing features before the inner rings are installed so that we have full access to the stabilizing grab-points?
2. Will we need be able to tighten and loosen the stabilizing features over time in the IR? When sPHENIX is not running and sitting idle in the IR do we need to be able to tighten the stabilizers?  Are there magnet maintenance scenarios through the life of the detector where we will need to tighten and loosen the stabilizers?
3. How much torque or force is needed to tighten and loosen the stabilizers? What kinds of tools do we need to clear access for to actuate the stabilizers? Hand tools? Hydraulic tools?

Is there a time we can meet next Monday or Tuesday to discuss? Who else should attend?

 

Thanks

Russ

 

Russell Feder

Brookhaven National Laboratory

sPHENIX Project Chief Mechanical Engineer

Physics Dept. Mail Stop 510C,  Office 2-218

Office: (631) 344-2253

Cell: (631) 655-2491