XLRIS Introduction

Actions

Trap Door

The current state of the trapdoor (open or closed) is displayed in red. To change the state, click the D (door) button to bring up a popup menu with options open and closed . Click on the desired option and press the SET button to make the change. Press DISMISS to exit the popup window.

Slit Mask

The name of the slit mask currently in the light path is displayed in red. To select a different mask, click the S (slitmask) button to raise a popup menu with other slitmask options. Click on the desired option and press the SET button to make the change. Press DISMISS to exit the popup window.

Grating

The name of the red-side grating currently in the light path is displayed in red. To select a different grating, click the G (grating) button to raise a popup menu with other grating options. Click on the desired option and press the SET button to make the change. Press DISMISS to exit the popup window.

Angle

The grating angle controls which wavelengths of the spectrum are imaged on the CCD. The current angle of the grating is displayed in red. To select a different angle, click the A (angle) button to raise a popup menu which allows angle input. Either type the desired angle into the text box, or use the slider to adjust the angle. Press the SET button to make the change. Press DISMISS to exit the popup window.

Wavelen

Instead of setting the grating angle directly, you can implicitly select the grating angle by specifying a certain central wavelength using this option if you are using a longslit. The current central wavelength (in Åstroms) is displayed in red. To select a different central wavelength, click the W (wavelength) button to raise a popup menu which allows wavelength input. Either type the desired central wavelength into the text box, or use the slider to adjust the wavelength. Press the SET button to make the change. Press DISMISS to exit the popup window. Note: this option only works for longslit observations made in first order.

MSWavelen

If you are using slit masks instead of the longslit, you can implicitly select the grating angle by specifying a certain central wavelength using the MSWavelen option (in first order only). The current central wavelength (in Åstroms) is displayed in red. To select a different central wavelength, click the W (wavelength) button to raise a popup menu which allows wavelength input. Either type the desired central wavelength into the text box, or use the slider to adjust the wavelength. Press the SET button to make the change. Press DISMISS to exit the popup window. Note: the specified central wavelength is accurate only for a slit lying in the center of the slitmask. Slits lying away from the center wll have shifted wavelength ranges.

Red Filter

The name of the red-side filter currently in the light path is displayed in red. To select a different filter, click the F (filter) button to raise a popup menu with other filter options. Click on the desired option and press the SET button to make the change. Press DISMISS to exit the popup window.

Red Focus

The red CCD dewar is moved to adjust the instrument focus. The current dewar position (measured in µm) is displayed in red. To select a different position, click the F (focus) button to raise a popup menu which allows focus input. Either type the desired position into the text box, or use the slider to adjust the position. Press the SET button to make the change. Press DISMISS to exit the popup window.

Dichroic

The dichroic is a beamsplitter which directs blue light to the blue beam of the instrument. To change the dichroic, click the D button to raise a popup menu with other dichroic options. Click on the desired option and press the SET button to make the change. Press DISMISS to exit the popup window.

Grism

The grism disperses light in the blue beam; the current grism is shown in red.. No wavelength adjustment is possible. to change the dichroic, click the G button to raise a popup menu with other grism options. Click on the desired option and press the SET button to make the change. Press DISMISS to exit the popup window.

Blue Filter

The name of the blue-side filter currently in the light path is displayed in red. To select a different filter, click the F (filter) button to raise a popup menu with other filter options. Click on the desired option and press the SET button to make the change. Press DISMISS to exit the popup window.

Blue Focus

The blue CCD dewar is moved to adjust the instrument focus. The current dewar position (measured in µm) is displayed in red. To select a different position, click the F (focus) button to raise a popup menu which allows focus input. Either type the desired position into the text box, or use the slider to adjust the position. Press the SET button to make the change. Press DISMISS to exit the popup window.

Lamps

LRIS features six internal lamps useful for wavelength calibration or spectral flat exposures, labeled Hg, Ne, Ar, Hal, Kr, Xe. Circles above each label are blackened when the lamps are off and colored when on. To change the state of a lamp, press the corresponding button above the circle. After a few seconds the color of the circle should change, indicating that the state has been modified.

Macro Buttons

WRITE

Press this button to save the current state of all spectrograph components (excluding trapdoor and lamp settings) in a file for later recall. A Write Setup window will appear, allowing you to enter a name for the setup file to be saved. Type a name into the text entry field and click the WRITE button to save the file.

GO

Press this button to execute a saved settings file created with the WRITE button. A popup menu will appear listing the available options. Select one by clicking on it, and it will execute.

Subwidgets

CMD...

Clicking this button will bring up a window that allows access to widgets that control dome lamps, guider filters, and AC power to the instrument components.

SET...

Clicking this button will bring up an obsolete, alternative GUI which is text-based and contains only red-side functions.

Exiting XLRIS