The Coude Echelle Spectrographs (Expert Information)
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Appendix C2: Aligning the Detector for UCLES
1. Installing the Detector
Install the detector and rotate it to align the echelle orders with the
pixels of the detector. Interactive procedures are described below, but
start with the settings in Table 1.
Table 1: Detector Rotation Settings for UCLES
||bthom, 2 clamp
ADD MITLL CCDS
2. Rotating the Detector
Configure UCLES to the blaze peak nearest the wavelength of highest priority,
or 5008 Å by default, using the 79 lines/mm grating.
UCLES: CENTRE PEAK 79
UCLES: SL MIN
UCLES: ARC QUARTZ
Select : WINDOW TEK1K_SETUP MITLL WINDOW
Take a ~10 second exposure.
To start the FIGARO routine ROTATION: log onto obsred on aatssf
and start AAT - rotation is in the setup menu. This will use the continuum
exposure, cross-correlate the top and bottom of the frame, and calculate
the amount of camera rotation required. ADD MITLL
A 4 mm hex-key is required to loosen the clamp on the CCD mount, and the
CCD can be physically rotated to the new micrometer setting.
Take another ~10 second exposure. The final image should resemble Figure
1, and be rotated to within 0.1mm (on the micrometer).
Figure1: UCLES, 10 sec quartz lamp, SL MIN, TEK1K_SETUP, correctly
Ray Stathakis (firstname.lastname@example.org)
Last Update: 22 March 2000