January 26, 2018 - Wien magnet coil discussion

Attending = Jay, Jeff, Danny, Joe

Goal = Discuss first prototype Wien magnet coil and magnet steel modifications

Conclusions

• Because square cross section is 33% less resistive than round Jeff will attempt to retain using this wire
• We discussed different coil geometries, but the standard/prototype geometry remains Plan A
• Because the prototype coil exceeds design cross section a groove was cut in magnet steel, however, this reduces magnetic field by about 8% and thus requires more current
• Jeff will wind next coil with two modifications, a) will do a dry wind (rather than wet epoxy on each turn) so that a single layer can be constructed and fixtured/press tighter into design cross section more easily and will then fix and tap a layer, b) will wind as many turns as possible within the allowed cross-section specification - the design is for 13 turns, but 10 turns is required. Based on previous coil Jeff made at least 11 turns, and this time will aim for 13, but if necessary will stop at 12, and 11 seems worst case but still acceptable.