From:	Lawrence E. Dudek
Sent:	Friday, July 22, 2011 2:41 PM
To:	NSTX Center Stack Upgrade Team
Cc:	Tiana Dodson; Bob Simmons
Subject:	Notes from Weekly Meeting 7/20

Notes from 7/20/2011 Meeting:
Calculation Spreadsheet ( Heitzenroeder)
Approximately 57% of the 45 completed calcs have been checked and 35% have been signed off 
by the cogs.

Passiv Plate Disruption Loads (Zhai/Titus) (see vgs)
Yuhu presented the latest checking analysis of the passive plate disruption analysis. A 
discrepancy was discovered between the initial and check calculation in 
conductivity used for the passive plates. The axisymetric initial calculation 
used a measured composite conductivity which included the brackets and VV 
wall.  This lower conductivity did not generate the skin effect seen in the more 
detailed 3D analysis which included separate conductivities for the copper 
plates and Stainless Steel support brackets.  The initial analysis without the 
skin effects allowed the radial field to drive through the plates and create eddy 
currents which resulted in high loads and stresses.  With the skin effects the 
checking analysis did not allow the radial fields to drive through and resulted 
in much lower loads.  One final analysis is being performed to measure the 
sensitivity of this effect and closeout the calculation.

 
http://nstx-upgrade.pppl.gov/Project_Meetings/CenterStackUpgrade/index_Meetings.htm