Changes
/* Vacuum Pumping and LN2 filling: */
notes might not be 100% accurate……
===Checklist:===
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''TODO: CLI startup & general computer interaction''
[[File:SPUPFig1.JPG]]
Note in Fig. 1 keyboard/mouse peripherals have been omitted for clarity
==='''Vacuum Pumping and LN2 filling:'''===
# The day before, connect the vacuum pump using the 500mm long vacuum hose (see Fig. 1) and pump-down overnight.
# The next morning, check that the vacuum got down to the 10-6 mbar range.
# Continue filling slowly until full, indicated by LN2 boiling in the outer funnel. When full, using a glove, quickly remove the inner funnel and dump the excess LN2 back in the filling flask.
# Ensure that the telescope is switched OFF
# Mount the instrument on the telescope (mechanical responsibility)
# Check the Hartmann Shutters (A & B) operation (ignore warning – it will disappear after a few seconds).
# Check the rear of slit mirror.
# Change the grating angle.
# Change the slit width.
# Select different filters.
* Do an ARC test exposure:
# Slit width 1.5” (slit setting 10).
# In the Main View tab, panel 2 (Fig. 10) check which grating is currently mounted and set the corresponding grating angle as per table 1:
The following three items are operated from the Main View tab, Panel 2 (Fig. 10). Select a value/number and click “Go”:
8.
a.
b.
Table 1: Suitable grating angle for a reasonable ARC exposure
Grating Number Angle
