ECHMAP --- Echelle Wavelength Coverage Simulator

THIS SOFTWARE IS EXPERIMENTAL

This is unlikely to work at all unless you are running an X11 compatible windowing system (including OpenWindows) that implements the xterm application or something very similar. You also need to be able to run program ssh (secure replacement for rsh) to make this connection.

The program ECHMAP draws a map of how the orders from the 4m echelle spectrograph will fit onto the CCD detector. It allows you to interactively experiment with different grating tilts, gratings, cameras, etc. so that you can determine the best setup for your project.

The map includes:

• A heavy box (green on color displays) which is the outline of the CCD.

• Many lines slanting upwards from left to right, showing the position of each echelle order on the CCD.

• Two approximately vertical lines, converging towards the bottom, which show the limits of the free spectral range of the echelle grating.

• Wavelengths marked along the edges are for the points where each order crosses the edge of the CCD.

• The maximum decker length for which the most closely spaced orders will not overlap is indicated at the bottom of the map.

• Information about the spectrograph setup appears above the map.

Users can interactively:

• Move the CCD around over the spectrum (represents tilting the echelle and cross-disperser gratings).

• Change any of the spectrograph setup parameters.

• Find the wavelength and order corresponding to any cursor position.

USE

Due to our efforts to improve computer system security here at CTIO, you'll need to use a secure login, ssh, to access the echmap program. If you have questions about ssh, see our CTIO Computer Security page.

NOTICE: The solution to the problems we were having with echmap running from GNOME/linux machines seems to be working. Let us know of any anomalies that show up...

• Open an xterm on your machine (some machines need 'ssh -X ...'), and type
  ssh ctios0.ctio.noao.edu -l echelle
  password = echmapper
• Answer the questions to define the setup.
• A graphics window should open up, the map should be displayed, and you should be able to interact with the program using a graphics cursor.

me@timbuktu% ssh ctios0.ctio.noao.edu -l echelle
echelle@ctios0's password: echmapper
Last login: Wed Mar 28 12:57:19 2001 from timbuktu
Welcome to ECHMAP (Local version)
 
[1] 10595
 

echelle grating? (1 = 31.6, 2 = 79): 2
x disperser l/mm: 316
x disp order: 1
camera (1 = short f.l., 2 = long f.l.): 2
port (1=right, 2=left): 2

Note: The red long camera always is on the right port, the 
blue long camera is always on the left. The air schmidt and 
folded schmidt can be used on either port.

ccd nx,ny,dx(mm),dy(mm): 2048 2048 .024 .024
central wavelengths: echelle, xdisp: 4982 4982
 name of file containing wavelengths (or none)?
none
 redshift?
0

The graph should look something like this (click for larger view)...