Facility Slitmask Inventory

The following standard slitmasks are available for use with LRIS.

Slitmask Name	Comments
Standard Longslits
long_0.7	Longslit 0.7 arcsec wide × 175 arcsec long
long_1.0	Longslit 1.0 arcsec wide × 175 arcsec long
long_1.5	Longslit 1.5 arcsec wide × 175 arcsec long
long_8.7	Longslit 8.7 arcsec wide × 175 arcsec long
Polarimetry Longslits
pol_1.0	Longslit 1.0 arcsec wide × 25 arcsec long
pol_1.5	Longslit 1.5 arcsec wide × 25 arcsec long
Imaging Focus Masks
focus_holes	17 columns × 22 rows of small holes, 13.3 mm apart

Multi Object Slitmasks

Multiobject Slitmasks are used by observers who desire to acquire more than one spectrum at a time. Prior to your run, slits are milled into sheets of aluminum by summit staff to prepair your slitmasks as specified in design files submitted to the slitmask database (see table below). The masks are then inserted into LRIS during the afternoon of your observing session. In practice, there are eight free slots available for user slitmasks. There are ten positions available, but two are reserved for "direct" imaging and a grid of "focus holes" used to focus the instrument in the afternoon.

Designing new slitmasks?

Please review the different slitmask procedures and the design tips page at the bottom of the table. Most observers use the Autoslit3 software to design their masks.

Mask-Design-Files (MDFs) are currently submitted via a Web Form (LRIS/DEIMOS Slitmask submission database ). Masks will be milled automatically after they are successfully ingested in the database. Please follow the Slitmask Design Submission Procedure to submit a mask for milling.

Below is a table of information that you may find useful in regards to slitmasks.

Mask Alignment Procedures	Slitmask alignment WITH pick-off mirrors
	Slitmask alignment WITHOUT pick-off mirrors
Mask design software   (Autoslit3 - Caltech)	Mask design with Autoslit3
	Autoslit3 manual
	Download Autoslit3: ftp site at Caltech
Mask design software   (UCSCLRIS - UCSC)	UCSCLRIS an alternative mask design software
Object Coordinates from LRIS images	Measure coordinates from LRIS images
	Download the coordinates source code
Slitmask Submissions	Slitmask Design Submission Procedure: Follow these steps to submit a mask design file.
	(LRIS/DEIMOS Slitmask submission database ). Masks will be milled automatically after they are successfully ingested in the database. Please follow the Slitmask Design Submission Procedure to submit a mask for milling. Below is a table of information that you may find useful in regards to slitmasks.   Mask Alignment Procedures Slitmask alignment WITH pick-off mirrors Slitmask alignment WITHOUT pick-off mirrors Mask design software   (Autoslit3 - Caltech) Mask design with Autoslit3 Autoslit3 manual Download Autoslit3: ftp site at Caltech Mask design software   (UCSCLRIS - UCSC) UCSCLRIS an alternative mask design software Object Coordinates from LRIS images Measure coordinates from LRIS images Download the coordinates source code Slitmask Submissions Slitmask Design Submission Procedure: Follow these steps to submit a mask design file. Masks submission and fabrication: connect to the mask database at Lick. Slitmask Status:: Allows you to monitor the slitmask inventory listed in chronological order. Design Tips and Considerations
	Last modified: 09/12/2024 01:05 Send questions or comments to:LRIS Support