Center of Well
Camera and Lamp
Collector
Overall Length......120 cm
Maximum Height........23 cm
Width........20 cm
Particulate
Concentrations
30-60 cm
Central Plateau
1-1.5 m
4-5 m
30-60 cm
Figure 7. Schematic of the 1.2-m collector in the SPWW.
tower and then connects to the collector (Fig. 8).
arrived at the final collector designs through a se-
The tower allows the collector to hang vertically
ries of laboratory tests, primarily using the 1.2-m
before descending through the well neck; it also
collector prototype. The goals of these tests were
allows the cable to warm slightly during ascent
to assess the collector's maneuverability and col-
before bending over the sheave. The winch, tower
lection efficiency on submerged, iced surfaces and
assembly, and video and collector control equip-
to make modifications as warranted before build-
ment fit inside the winch room located directly
ing the 2.4-m collector. We used two main test fa-
cilities: a 1.5 m 1.5 m 0.3-m-deep tank with a
above the second access hole to the SPWW
(Fig. 2).
cold plate on its bottom to grow a flat layer of ice,
and a 2.5-m-wide 6-m-long 3.6-m-high iced
Prototype tests and modifications
ramp with a curved parabolic profile that approxi-
Validating the performance of our particle col-
mated published shapes for earlier Rodriguez
lection system prior to its first use at the South
wells (Schmitt and Rodriguez 1963, Russell 1965,
Pole was an essential step in our design plan. We
Williams 1974, Lunardini and Rand 1995). We
10
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