Photograph of XLPD (left) and schematic of negative bias probe circuit (right). One 2.5 cm and one 20 cm Cu-foil-shielded probe (A) are attached to a bias box (B), which is mounted in any one of four positions on the XLPD cassette face (C).
Model of Langmuir probe diagnostic (XLPD) shown mounted on rails for installation and alignment. Visible in the model are the bias boxes and a bulkhead with eight SMA feedthroughs for signal-cable management.
XLPD data recorded for stainless-steel cavity target shots. All probes are biased at −20 V.
Comparison of shielded vs. unshielded probe traces. For the stainless-steel cavity shots, the probes were 20 cm from the target and biased at −20 V. The shielded and unshielded probes for the Fe-aerogel shots were 25 and 30 cm from the target with −20 and –25 V bias, respectively.
Article metrics loading...
Full text loading...