Background

With the DEIMOS Arcplots widget, observers can generate arc line plots customized to any grating, central wavelength, and set of line lamps. This is useful for verifying the achieved wavelength range for specific slits. The spectra displayed by the GUI were acquired with the DEIMOS 600 l/mm grating in May 2007.

Invocation

To launch the widget from the DEIMOS background menu, select DEIMOS Utilities > DEIMOS Arcplots Widget. After a few seconds, the IDL Virtual Machine banner will appear. Click this, and the widget will run.

Interface

The GUI is shown below.

Controls

Lamps

Click the toggle buttons to turn on the desired lamps. The corresponding DEIMOS spectrum will be shown in the plot area.

Grating options

Grating
Select the appropriate grating, which controls the range of wavelengths visible in the plot.
Central wavelength
Specifies the desired central wavelength for the spectrum (Angstroms). You can type in a new wavelength and press RETURN to change the setting. You can also adjust this parameter by clicking the MIDDLE MOUSE button on the spectrum plot.
Blue limit
Shows the starting (blue) wavelength for the spectrum (Angstroms). You can type in a new wavelength and press RETURN to change the setting.
Red limit
Shows the starting (blue) wavelength for the spectrum (Angstroms). You can type in a new wavelength and press RETURN to change the setting.

Marking Options

Mark lines
Click toggle to enable/disable arc line labeling
Label lines
Click toggle to select display of lamp name or wavelength for features
Max lines
Select "all" to mark all arc lines, or set to another value to mark the N brightest lines.

Buttons

Print
generate a hardcopy of the current plot, or save to a Postscript file
Quit
Exit the application

Distribution

Please click here to obtain a copy of the DEIMOS arcplots widget in a binary format compatible with IDL and the free IDL Virtual Machine (VM). With either IDL or the VM, you can run the widget at your home institution.