1. Small scale testing options Collecting material and analysis from J. van Nugteren and G. Kirby

2. Use Feather-0 as is 0.3 mm conductor, 0.1 mm insulation (both sides) 18 turns J E ≈ 400 A/mm 2 Approximately 1 T bore field

3. Feather-0 Peak field 9.2 T in the ends

4. Feather-0 Field angle approximately 6 degrees at 8 T background field

5. Double-decker Feather-0 (F0E1) 0.3 mm conductor, 0.1 mm insulation (both sides) 2x20 turns J E ≈ 400 A/mm 2 Approximately 1.6 T bore field

6. Double-decker Feather-0 Peak field 3 T in the ends

7. Double-decker Feather-0 This was the initial design of Feather-0 (two decks, layer jump)

8. Double-decker Feather-0-mod Peak field 4 T in the ends Additional field gain adding an iron pole (1 T ?)