Lab data from UT250425
Data taken just preceding spectrograph disassembly in lab. Data from calibration source taken both directly with 50 micron fiber and through calibration channel. Solar data through long (poor throughput) 200 micron fiber, using a mirror to reflect sunlight onto the fiber tip (in the building lobby).
Note that we discovered after the fact that only one channel of the heater for the iodine cell was functioning, so while one half was set to and reading 60C, the other half was only reading ~42C.
Flats (LED+tungsten with and without iodine) and solar (w/ and w/o iodine):
LED and tungsten (separately) direct
Resolution plot
Image log:
Results from lab testing UT250416
eShel calibration source connected directly to spectrograph input with 50 micron fiber because of issues with long eShel 200 micron fiber (which was very faint). Also removed beam splitters to increase throughput.
Long eShel fiber was used to collect sunlight from outside into the building lobby with a mirror, then fed into calibration channel, which feeds a 50 micron fiber in the Shelyak FIGU unit that connects to spectrograph input.
