Part No. 402-0085 CD ECCN: EAR99 HTS: 9031.80.8085 General Purpose Current Density Probe This is a planar style Faraday probe with guard ring, well suited to current density measurements in both commercial plasma processing and electric propulsion environments. Typically, the collector and guard ring are biased negative of chamber ground or plasma potential, by about 20 V, to repel electrons and only collect ions. The probe body is isolated from the collector and guard electrodes for easy placement on any chamber surface. This probe features molybdenum front-facing collector and guard surfaces for minimum sputter contamination and low secondary electron yield. Stainless steel components can be substituted if the probe is to be heavily used in oxygen-rich environments, or graphite components for even better sputter resistance. The probe's bracket has 2x #4 through holes and 2x #4-40 threaded holes for optional use. A 3-lug triax jack is standard, carrying the collector signal on the center conductor (CTR), and the guard signal on the inner shield (MID). The outer shield (OUT) is connected to the probe body. Collector area: 0.5 cm2 Mass: 121 g (without triaxial cable attached). Lead Time: Typically 4 weeks if not in stock. The "Probe Only" option is the current density probe having a side-mounted 3-conductor connector. The "Probe + Feedthrough + Cables" option includes the probe, in-vacuum and air-side teflon-based cables, and a double-ended feedthrough. By default, each cable is 10 feet (3 meters) long, and the feedthrough is mounted on a KF40 flange - we will confirm these options prior to assembly. Accessories: Plasma Controls can provide both in-vacuum and air-side cables at customer-specified lengths, as well as feedthroughs mounted on KF16, KF40, KF50, Conflat CF1.33, CF2.75, CF3.375, NASA 4.5"OD standard, or customer-specified flanges.
