New version page

Hectospec Observers Reference Manual

Upgrade to remove ads

This preview shows page 1-2-3-4-5-35-36-37-38-39-71-72-73-74-75 out of 75 pages.

Save
View Full Document
Premium Document
Do you want full access? Go Premium and unlock all 75 pages.
Access to all documents
Download any document
Ad free experience
Premium Document
Do you want full access? Go Premium and unlock all 75 pages.
Access to all documents
Download any document
Ad free experience
Premium Document
Do you want full access? Go Premium and unlock all 75 pages.
Access to all documents
Download any document
Ad free experience
Premium Document
Do you want full access? Go Premium and unlock all 75 pages.
Access to all documents
Download any document
Ad free experience
Premium Document
Do you want full access? Go Premium and unlock all 75 pages.
Access to all documents
Download any document
Ad free experience
Premium Document
Do you want full access? Go Premium and unlock all 75 pages.
Access to all documents
Download any document
Ad free experience
Premium Document
Do you want full access? Go Premium and unlock all 75 pages.
Access to all documents
Download any document
Ad free experience
Premium Document
Do you want full access? Go Premium and unlock all 75 pages.
Access to all documents
Download any document
Ad free experience
Premium Document
Do you want full access? Go Premium and unlock all 75 pages.
Access to all documents
Download any document
Ad free experience
Premium Document
Do you want full access? Go Premium and unlock all 75 pages.
Access to all documents
Download any document
Ad free experience
Premium Document
Do you want full access? Go Premium and unlock all 75 pages.
Access to all documents
Download any document
Ad free experience
Premium Document
Do you want full access? Go Premium and unlock all 75 pages.
Access to all documents
Download any document
Ad free experience
Premium Document
Do you want full access? Go Premium and unlock all 75 pages.
Access to all documents
Download any document
Ad free experience
Premium Document
Do you want full access? Go Premium and unlock all 75 pages.
Access to all documents
Download any document
Ad free experience
Premium Document
Do you want full access? Go Premium and unlock all 75 pages.
Access to all documents
Download any document
Ad free experience

Upgrade to remove ads
Unformatted text preview:

- 1 - Hectospec Observers Reference Manual Draft of April 9, 2004 Daniel Fabricant Nelson Caldwell Figure 1. Hectospec focal surface.- 2 - 1 INTRODUCTION.................................................................................. 4 2 HECTOSPEC SPECTROGRAPH DESIGN ...................................... 5 2.1 INTRODUCTION .............................................................................................. 5 2.2 BENCH SPECTROGRAPH OPTICAL DESIGN ............................................. 6 2.2.1 OPTICAL DESIGN PARAMETERS .......................................................................... 6 2.2.2 SPECTROGRAPH OPTICAL PRESCRIPTION (MM) ............................................. 6 2.3 GRATING CHOICES ........................................................................................ 7 3 SPECTROGRAPH PERFORMANCE ............................................. 10 3.1 CALCULATED THROUGHPUT.................................................................... 10 3.2 MEASURED THROUGHPUT ........................................................................ 10 4 FITTING FIBERS TO TARGETS .................................................... 11 4.1 INPUT CATALOG........................................................................................... 11 4.2 HECTOSPEC ROBOT TV GUIDERS AND GUIDE PROBES ..................... 12 4.3 ASSIGNING GUIDE STARS .......................................................................... 14 RUNNING XFITFIBS.................................................................................................. 16 5 BENCH SPECTROGRAPH............................................................... 22 5.1 PUMPING OUT AND FILLING THE DEWAR WITH LN2......................... 22 5.2 BENCH SPECTROGRAPH & FIBER REFERENCE..................................... 30 5.2.1 MOVING FIBER SHOE BETWEEN HECTOSPEC AND HECTOCHELLE .......... 30 5.2.2 FIBER SHOE LAYOUT ........................................................................................... 32 5.2.3 CCD AND DEWAR ................................................................................................. 32 5.3 GETTING BENCH READY AT BEGINNING OF A NEW RUN................. 34 6 HECTOSPEC OBSERVING PROCEDURES ................................. 36 6.1 INTRODUCTION ............................................................................................ 36 6.2 START UP PROCEDURE............................................................................... 37 6.2.1 TURNING ON THE COMPUTERS IN THE CONTROL ROOM............................ 37 6.2.2 TURNING ON THE COMPUTERS IN THE F/5 STORAGE ROOM ...................... 38 6.2.3 STARTING UP THE SOFTWARE ........................................................................... 40 6.2.4 TURNING ON THE POWER AND HOMING THE ROBOTS ................................ 42 6.3 STARTING UP THE WAVEFRONT SENSOR ............................................. 46 6.4 STARTING UP THE WIDE FIELD CORRECTOR ....................................... 50 6.5 MOUNT STATUS DISPLAY.......................................................................... 51 6.6 OPERATING THE FIBER POSITIONER ...................................................... 52 6.6.1 SETTING UP FOR WAVELENGTH CALIBRATION, DOMEFLATS, ETC. .......... 54 6.6.2 SETTING UP A CONFIGURATION FOR OBSERVATION ................................... 55 6.7 OPERATING THE BENCH SPECTROGRAPH ............................................ 57 6.7.1 AT THE BEGINNING OF EACH NIGHT ............................................................... 57 6.7.2 INITIALIZING THE SPECTROGRAPH MOTORS................................................. 58 6.7.3 STARTING UP “SPICE” DATA ACQUISITION AND EXPOSURE STATUS GUI 60 6.7.4 STARTING UP THE CALIBRATION LAMPS........................................................ 61 6.8 TAKING DATA WITH SPICE........................................................................ 63- 3 - 6.8.1 SPICE DETAILS...................................................................................................... 64 6.8.2 EXPOSURE STATUS GUI ...................................................................................... 67 6.8.3 DATA FORMAT. ..................................................................................................... 68 6.8.4 DS9 BASICS ............................................................................................................ 68 6.9 AT THE END OF THE NIGHT....................................................................... 69 6.10 COMPLETE SHUTDOWN PROCEDURE.................................................... 69 6.10.1 POWERING DOWN THE DOME CALIBRATION BOXES FOR LIGHTNING PROTECTION ......................................................................................................................72 72 6.11 AT THE END OF THE RUN........................................................................... 35 7 LOW LEVEL FIBER POSITIONER SOFTWARE........................ 73 7.1 FIBER POSITIONER CONTROL SOFTWARE ............................................ 73 7.1.1 MID LEVEL COMMANDS...................................................................................... 73 7.1.2 LOW LEVEL COMMANDS..................................................................................... 73- 4 - 1 INTRODUCTION The Hectospec is a multiobject, moderate-dispersion spectrograph that uses a pair of six-axis robots to position 300 optical fiber probes at the f/5 focus of the converted MMT. The converted MMT’s f/5 focus uses a refractive corrector designed by Harland Epps to provide a 1° diameter field optimized for fiber-fed spectroscopy. The Hectospec consists of three major parts: (1) the fiber positioning unit that is mounted on the telescope, (2) a large stationary spectrograph mounted on a 1.8x3.7 m Invar-surfaced optical bench and (3) a 26 m-long bundle of optical fibers connecting the fiber positioner and spectrograph. The fiber robots position 300 fibers in 300 s to an accuracy of ~25 µm. Each fiber has a core diameter of 250 µm, subtending 1.5″ on the sky. Adjacent fibers can spaced as closely as 20″, but the positioning constraints are complicated due to the tube extending from the fiber button to the edge of the focal surface. Currently we possess one grating for Hectospec, a 270 line mm-1 grating blazed at ~5000 Å. We have on order a 600 line mm-1 grating blazed at ~6000 Å


Download Hectospec Observers Reference Manual
Our administrator received your request to download this document. We will send you the file to your email shortly.
Loading Unlocking...
Login

Join to view Hectospec Observers Reference Manual and access 3M+ class-specific study document.

or
We will never post anything without your permission.
Don't have an account?
Sign Up

Join to view Hectospec Observers Reference Manual 2 2 and access 3M+ class-specific study document.

or

By creating an account you agree to our Privacy Policy and Terms Of Use

Already a member?