No. 42, June 1995)
Larry Junco, senior instrument maker, checking the optical bench for
the Phoenix foreoptics. The optical bench is being made on the MAHO
numerically controlled tooling center in the NOAO machine shop.
Phoenix, a high-resolution infrared spectrograph, continues to progress
rapidly toward first light next winter.
John Stein, senior instrument maker, is shown just after turning the
support ring for the foreoptics plate. The large hole to toward John
is the detector access hole. The small hole at the bottom is one of the
cooler access holes.
Lyot/filter wheel. The filter wheel has 13 positions for
discrete order sorting filters: an open,
1935 cm-1 (5.17 microns), 2030 cm-1 (4.93 microns),
2150 cm-1 (4.65 microns), 4220 cm-1 (2.37 microns),
4308 cm-1 (2.32 microns), 4396 cm-1 (2.27 microns),
4484 cm-1 (2.23 microns), 4572 cm-1 (2.19 microns),
4660 cm-1 (2.15 microns), 4748 cm-1 (2.11 microns),
8265 cm-1 (1.21 microns), and 9232 cm-1 (1.08 microns).
Users can request a specific blocking filter. Additional filters
for 2462 cm-1 (4.06 microns), 4132 cm-1 (2.42 microns),
6080 cm-1 (1.64 microns), and 7799 cm-1 (1.28 microns) are available
for the instrument. Ordering a new filter takes several months.
Changing filters requires notice of at minimum several months.
The Lyot wheel contains stops appropriate for the 2.1 and 4 meter
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