Page 4 - Jet outflow and open field line measurements on the C-2U advanced beam-driven field-reversed configuration plasma experiment

11D435-4 Thompson et al.
End loss analyzers (ELAs) were the primary new divertor
diagnostic deployed on C-2U.25 The C-2U ELA package
consisted of two pyroelectric crystal bolometers to measure
total particle power density and two gridded ion energy
analyzers that measure ion current density and can also
measure ion energy distribution. These four devices were
placed in a ring encircling the plasma gun in one of the
divertors. Redundancy of the detectors provided a degree of
failure tolerance and the ability to detect gross azimuthal
asymmetries in the plasma outflow. Early results from the
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ELA (ion current density ⇠1 kA/m2 and power density 2 25
⇠1 MW/m ) are broadly consistent with expectations from computed core FRC particle and energy losses and firmly establish our capability to perform detailed energy loss studies in future campaigns. Since there are practical limits to the density of ELAs deployed on the plasma terminating wall of the divertor, we also tested thermographic imaging of the divertor plates on C-2U. Even at the relatively low level of total energy input characteristic of C-2U shots (⇠100 kJ), thermography clearly showed the overall distribution of deposited heat on the divertor biasing plates.
ACKNOWLEDGMENTS
We thank our shareholders for their support and trust, and all fellow TAE sta↵ for their dedication, excellent work, and extra e↵orts.
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