issues 40 min. rep. rate Fabrication of flex sections –Water jet cut copper –Copper flat cable –Others – electroform brazed straps –Shape –OOP support Testing of flex section candidates. –How to simulate OOP loads Reaction of out of plane load –Structure details –Need for a flex section between flag & outer TF leg TF outer leg support –Is it worth making any changes or is the present adequate? Action: will start at short pulse so rep rate will only be a concern later. Consider upgrades for shorter rep rate if affordable. Need to understand reqmts. & behavior better – more analyses. A.J. Tuck in Conn. For electroform braze; alternative wire EDM A key detail needed for success! Consider a large diaphragm for torque reaction/thermal expansion. TF single turn joint model

PF 4/5 –Struts between them are needed VV –Mid band stresses are too high by a factor of ~2 – will need to weld a reinforcement band around the inside of the VV. –Will need to check weld stresses at port extensions and possibly reinforce the welds Modeling: –HM’s current model has the old skinny CS – this could send too much torque to the VV Need to add the new CS details –Need to update the global model with the reinforced umbrella structure, new CS, flex regions, etc.

Consider a 12 turn TF design to create space. TF copper –Is the currently proposed conductor viable to be fabricated? –What is the fallback? Fabricate in 2 halves, machine colant groove, bond the halves together like C-Mod. OH coils –Leads Is it reasonable for the worst-case condition to be a design condition? –Possibly have a different set of allowables for these “off normal” conditions Disruption loads –How to handle impact loads – do accelerometer studies on NSTX. PF coils –Are there any conditions that put the coils in hoop compression with the possibility of buckling? Should check. TF joint heating –Need to study heat diffusion from joint interface. –Should do EM current diffusion calculations\ –Need to adequately validate the joint design with testing at high currents and multiples of operating current. Investigate other high current joint concepts –Multilam, button contacts, felt metal, etc. Maybe check with high current switchgear manufacturers to see fi they have a solution. –What current density should we be targeting? Do measurements of deflections on NSTX to benchmark the analyses. Analyze the castings in detail, adding “prying” action which may open casting halves.