PIX 2 [NASA]
The PIX (Plasma Interaction Experiment) experiments were add-on experiments mounted on Delta second stages to investigate high voltage discharge and arcing on spacecraft components.
PIX 1 consisted of a 96 cm by 81 cm experiment plate mounted on one side of the Delta-2910 stage while an electronics box was on an other side. PIX 1 was conceived to gain some data, which the failed SPHINX A spacecraft should have provided, until the more sophisticated DoD/NASA P78-2 SCATHA satellite was flown. The payload consisted of a sample solar cell and some insulation experiments.
PIX 2 was a similar experiment flown some years later on the Delta-3910, which launched IRAS, featuring sample solar cells and a Langmuir probe. The PIX 2 consisted of an approximately 2000 cm2 array divided into four equal segments. Each of the segments could be biased independently and the current measured separately. In addition to the solar array segments, PIX 2 had a hot-wire-filament electron emitter and a spherical Langmuir probe. The emitter was operated when the array segments were biased positively above 125 V. Thermal electrons from the emitter aided in balancing the electron currents collected by the array.
|Type / Application:||Research|
|Operator:||NASA Lewis Research Center|
|Contractors:||NASA Lewis Research Center|
|Configuration:||Experiments on Delta second stage|
|Propulsion:||None in orbit|
|Mass:||34 kg (experiment only) (#1); 45 kg (experiment only) (#2)|
|Orbit:||668 km × 875 km, 98.6° (#1); 855 km × 887 km 100.0°|
|PIX 1||1978-026C||05.03.1978||Va SLC-2W||Delta-2910||with Landsat 3, AMSAT P2D|
|PIX 2||1983-004B||26.01.1983||Va SLC-2W||Delta-3910||with IRAS|