Page 12 - Two-chord Interferometry using 3.39 µm He-Ne Laser on a Flux-Coil-Generated FRC

Assume no net flux between flux coil and separatrix
total flux = flux in inner coil + flux in vacuum area
flux loop at inner coil
r ≡ outer separatrix radius s
rwall
φl ≡ flux within outer wall
rseparatrix
rflux coil
r=r2− φ−φ 1()
Air
Plasma
φf ≡ flux within inner coil
Vacuum
r ≡ radius of outer flux loop l
flux loop & Bz probe at outer wall
Bl ≡ axial magnetic field at outer wall
12 HTPD2010, Wildwood, NJ, 5/17/2010
Presenter: Hiroshi Gota
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Separatrix Calculation
φ =φ +π(r2 −r2)B lflsl
s l πB l f l