From: Arthur W. Brooks
Sent: Thursday, September 27, 2007 4:20 PM
To: Thomas G. Brown; Michael R. Kalish
Cc: Phil Heitzenroeder; Michael C. Zarnstorff; Hutch Neilson

Attachments: extrim_012606 Numbering.ppt

Tom, Mike,

After some discussion with Mike Z and Hutch we have narrowed the candidate locations for the trim coils. The attached sketches show the full set of trim coils that we are selecting from. Of that we would like to have (for day 1) 2 sets of 6 identical coils, each of which is on the same coil type and in the same position (ie stellarator symmetric). This gives a total of 12 coils.

The preferred locations are: 2&4, 2&5 or 5&7, all of which are on the type A coil. Location 2 is the bottom of the A coil (which becomes the top for the other half period). Location 7 is the top of the A. Locations 4 and 5 are just below and above the outboard midplane (neither coil straddles the midplane). 

The current levels that we must design for is 60 KAT. This is larger than I hoped for but necessary from a field error suppression standpoint.

Art