Error field generation of solenoid magnets Page: 5 of 12
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For the model simulating the “joggle-wound” coil, the field is
calculated due to small (360/loop) straight-line current segments
which incrementally follow the path of the joggled loop.
The angular position where the current element stops following
the circular loop to “joggle” to the next turn is determined by the
dimensions of the wedge (Figure 3), which are input variables to the
program. An additional input variable is used to determine the angular
precession of these joggles as the winding progresses from turn to turn
along the layer (Figure 4).
At each flange, the current element follows a circular path along
the flange, ramps up to the next layer, and continues the circular path
along the flange until it meets a diametrically placed wedge and joggles
to the next turn to complete the new layer.
The overhead buswork was also modeled to determine its con-
tribution to the error field. The buswork consists of a system of
current-carrying segments which repeat every 40 degrees for a total of
nine sections (refer to Figure 5). Only those leads which carry current
during normal operation were considered; that is, all power supply
leads and dump circuitry were ignored. This buswork was then
TURN/TURN
WEDGE
TOP VIEW
SIDE VIEW
CONDUCTOR
HEIGHT
I
LAYER/LAYER
RAMP
CONDUCTOR
WIDTH
Figure 3. Wedge /ramp for joggled winding method.
5
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Saunders, J. L. Error field generation of solenoid magnets, article, January 1, 1982; United States. (https://digital.library.unt.edu/ark:/67531/metadc1067002/m1/5/: accessed July 16, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.