Aligning detector (UHRF)

The Coude Echelle Spectrographs (Expert Information)

Appendix C4: Aligning the Detector for UHRF

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1. Installing the Detector

Install the detector and rotate it to align the spectral lines 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 UHRF

Detector Mounting Plate Micrometer
(mm)

Tektronix bthom, 2 clamp 9.2

ADD MITLL CCDS

2. Rotating the Detector

Configure UHRF to the laser, using the V or R cross dispersor depending on the planned observations:

UHRF: USE DISK$USER:[UCLES.UHRF]LASER_6328V (

LASER_6328R)

UHRF: CONFIG

UHRF: ARC LASER

Take ~10 second exposure, adjust UT and UG to roughly centre the line on the CCD (see ?? ), then switch to a small, unbinned central window (e.g. TEK1K_SETUP). Adjust UFC/UFF to bring it into focus. (see ??.)

The detector must now be rotated to align the laser line with the CCD rows. (This contrasts with UCLES and the RGO spectrographs for which the orders are aligned.)

This should not be done with the slit angle; this must be SA 2160 for the slit to lie horizontal through the spectrograph and deliver maximum resolving power.
To start the FIGARO routine ROTATION: log onto obsred on aatssf and start AAT - rotation is in the setup menu. This will cross-correlate the ends of the laser line and calculate the amount of camera rotation required.
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. Detector rotation should be better than 0.05 of a pixel.

UHRF should now be ready for the observer.

Ray Stathakis (ras@aaoepp.aao.gov.au)
Last Update: 22 March 2000

Detector	Mounting Plate	Micrometer (mm)
Tektronix	bthom, 2 clamp	9.2