Page 11 - Progress minimizing fast-ion charge-exchange loss associated with gas injection on C-2W
P. 11
Midplane gas injection detrimental to fast ion confinement
5.0 2.5 0.0
4 ×107
2
0
×10 6
5
0
0.000 0.005
Balmer-α emission, radial view
0.010 0.015 0.020 Time [s]
0.025
• Fast ions traverse far into scrape-off-layer.
• → Must keep gas injection neutrals away from fast ions
EM NPA (arb) Neutrons
Etot,FRC [kJ]
• CV gas depresses beam-target neutron signal.
Fast ion CX
H
D
• NPA CX signal spikes after each
CV gas pulse. Presenter: Erik Granstedt (≳ 1 m from midplane). 8
