From:                              Lawrence E. Dudek

Sent:                               Thursday, August 05, 2010 4:50 PM

To:                                   NSTX Center Stack Upgrade Team

Subject:                          NSTX CSU Project Meeting  notes from 8/4/2010

 

Notes from 8/4 Meeting:

Some dates to remember:

                        • CD-2 Lehman Cost and Schedule Review August 10-11

                        • CD-2 September

                       

Update on Umbrella Lid  (Smith) (See VGs)

Mark presented the latest refinement of the upper and lower umbrella lids.  Some discussion on how to connect the lid to the umbrella cylinder.  Need to ensure that the connection can move freely even under torsional load.  May need to resort to a linear bearing (off the shelf?)

 

Update on Flex Joint  [Willard ]

Vendor produced a test sample using a soldered connection. The samples Tom passed around looked good.  Samples were soldered and then subjected to a bend test in a vise.  No separation of the laminations was evident.  Next step is to solder an assembly being prepared in the Tech Shop and subject it to cyclic loading tests.

 

Update on MPTS VV Interface [Willard (see VGs) ]

Tom reviewed the latest analysis on the VV under vacuum and magnetic loads results for deflections and stress were presented.  Results compared nicely with Sri's earlier results.  Next would be disruption analysis.  Tom would like to use Maxwell to assemble an axisymetric model.  Titus has a concern that the resulting model would not be practical because of the size required. 

 

After a long discussion the following plan of action was agreed to:

1. Mark Smith offered to estimate how long the model would run using information from some of the models he has run in the past. 

2. If the result appears tractable Tom would proceed with building the model

3. The model Tom builds will be built such that Ron Hatcher can use it with Opera for future work on the VV analysis.

 

OH Coil Belleville Washer spring design (Zolfigari) (See VG)

 

Ali presented the parameters being used to design the OH Coil preload belleville stack.  The highest normal operation force is 10K lbs. but the design could easily be upgraded to 20k lbs to give some margin, so that will be the plan going forward.

The max power supply limits are 400k lbs, so there will need to be DCPS algorithms to protect the OH coil in that situation.