CCDS-Specific Prospero Commands
In addition to the general Prospero commands for taking data, there are
a number of special commands specific to the CCDS:
- Grating Setup
- These commands must be used whenever the grating is changed,
or after restarting Prospero for any reason.
- GROOVES - set the grating ruling in grooves/mm
- Example: GROOVES 350 for the 350 grooves/mm grating
- ORDER - set the order of the grating
- Example: ORDER 1 for first order
- GRSETUP - Prompt user for grooves and order info. A novice
version of GROOVES and ORDER
- Grating Tilt
- These commands are used to control the tilt of the grating to
select a specific central wavelength.
- CENTER - set the central wavelength
- Example: CENTER 5520 - set the central wavelength to 5520Å
- NEWCENTER - recalibrate the central wavelength
- Example: NEWCENTER 5500 - tell CCDS that the actual central
wavelength is 5500Å, correcting any zero-point offset.
- This is done if you select a central wavelength using CENTER
and find that the actual central wavelength is different.
- GRATZERO - tilt the grating to the zero-th order position
- GRATTILT - tilt the grating to a specific device-encoder setting.
- Example: GRATTILT 59100 - commands the grating to tilt to the
position defined by 59100 encoder units. This is a low-level
command that should only be used if you want to scan the grating without
reference to wavelength (like CENTER).
- Grating System Reset and Status
- These are engineering commands used to reset the grating mechanism
(e.g., before or after a grating change or major IE fault), or to
check the current values of the grating system parameters when debugging
- GRESET - reset the grating tilt mechanism
- Used to reset the tilt mechanism by driving the grating to its home
position (well past zero-th order). This operation takes 3-4 minutes
and should only be done if absolutely necessary.
- GRATPARS - print the current CCDS Grating Parameters
- This command dumps the internal Grating parameter tables to the screen.
These data are only useful for engineering or troubleshooting problems.
Updated: 2006 November 10 [rwp/osu]