Astronomy 920 commissioning of the prime focus imaging spectrograph
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Astronomy 920 Commissioning of the Prime Focus Imaging Spectrograph. Meeting 8 SALT IRAF Package II Ken Nordsieck. PFIS commands. PFIS/ SALT IRAF Package Hierarchy implemented lower level pprepare p pireduce r pmosaic mimcoadd

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Astronomy 920 Commissioning of the Prime Focus Imaging Spectrograph

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Astronomy 920 commissioning of the prime focus imaging spectrograph

Astronomy 920Commissioning of the Prime Focus Imaging Spectrograph

Meeting 8

SALT IRAF Package II

Ken Nordsieck

Ast 920 Meeting 8


Pfis commands

PFIS commands

PFIS/ SALT IRAF Package Hierarchy

implemented

lower level

pprepareppireducerpmosaicmimcoadd

pgainpbiaspsreducepspstransformtpsskysubspsextracte scombine

piflatpsflatpswavelengthpscalibratecpsstandard

pbpmpscut

  • Raw data

    • name: Pyyyyddddssss.fits, ie P200510200079.fits

    • "multiextension" fits file, one for each of 6 amplifiers; open in DS9 with "open other/ open mosaic IRAF"

  • Each stage of processing prepends a letter or two

    • Imaging: (pireduce, pmosaic) mrpP200510200097.fits

    • Spectroscopy: (psreduce) psP2.....

Ast 920 Meeting 8


Imaging

Imaging

  • pprepare (p)

    • check header validity,

    • get data from calibration database

  • pireduce (r)

    • remove crosstalk

    • subtract mean of overscan in each amp, trim

    • divide by gain for each amp

    • subtract bias, if specified

    • subtract dark, if specified

    • divide by flat, if specified

  • pbias: run pireduce on bias frames, bias/ dark/ flat turned off

  • pflat (TBI) run pireduce on flat frames, dark/ flat turned off

  • pmosaic (m)

    • combine amplifiers and ccd's into single fits files

    • can now be opened as normal image by DS9

  • imcoadd (TBI)

    • remove distortion

    • combine mosaiced images, registering and removing cosmic rays

Ast 920 Meeting 8


Spectroscopy

Spectroscopy

  • psreduce (ps)

    • run pireduce

    • run pmosaic

    • using slitmask definition file (MDF), cut into one piece for each slit (pscut)

    • apply first guess wavelength calibration to each

  • psflat (TBI) run psreduce on spectral flats (tungsten continuum spectrum)

  • pswavelength identify lines and update wavelength dispersion calibration for wavecal frame

  • pstransform (TBI) resample cut spectra onto linear wavelength vs space grid

  • psskysub, psextract (TBI) extract to 1-d raw spectra

  • pscalibrate compute flux cal from flux standard

Ast 920 Meeting 8


Configuration data ccd

Configuration Data - CCD

Instrument configuration data: $salt/pfis/data (IRAF pfis$data)

  • PFISamps gain and noise for ccd amps

    # Database of PFIS CCD amplifier properties

    # 28 Oct 2005 - Lab Data

    # Note: Bias not updated - should depend on binning KHN

    # ROSPEED GAINSET GAIN RDNOISE BIAS AMP

    SLOW FAINT 1.19 2.46 2108 amp1

    SLOW FAINT 1.24 2.42 2064 amp2

    SLOW FAINT 1.30 2.33 2281 amp3

    SLOW FAINT 1.21 2.43 2285 amp4

    SLOW FAINT 1.20 2.91 2227 amp5

    SLOW FAINT 1.11 2.51 2241 amp6

    SLOW BRIGHT 2.91 3.74 2098 amp1

    SLOW BRIGHT 3.02 3.78 2097 amp2

    SLOW BRIGHT 3.15 3.62 2116 amp3

    SLOW BRIGHT 2.95 3.56 2104 amp4

    SLOW BRIGHT 3.03 4.14 2111 amp5

    SLOW BRIGHT 2.78 3.54 2101 amp6

    FAST FAINT 5.04 6.59 2224 amp1

    FAST FAINT 5.38 6.78 2164 amp2

    FAST FAINT 5.53 6.15 2200 amp3

    FAST FAINT 5.24 5.88 2179 amp4

    FAST FAINT 5.30 7.82 2162 amp5

    FAST FAINT 4.81 4.81 2161 amp6

    FAST BRIGHT 10.47 10.20 2123 amp1

    FAST BRIGHT 11.09 10.68 2098 amp2

    FAST BRIGHT 11.49 9.82 2115 amp3

    FAST BRIGHT 10.67 9.18 2104 amp4

    FAST BRIGHT 11.09 10.81 2098 amp5

    FAST BRIGHT 10.34 9.57 2095 amp6

  • Commissioning: done

Ast 920 Meeting 8


Configuration data crosstalk

Configuration Data - Crosstalk

  • PFISxtalk crosstalk coefficients

    # PFIS CCD amplifier crosstalk data

    # from 20041201 gain = bright distortion image, outer amps duplicated

    # Date VCTM 2 2 4 3 6 5

    # SRC 1 2 3 4 5 6

    2004-01-01 .001474 .001474 .001166 .001111 .001377 .001377

  • Calibrated using line spectrum with bright lines across all 3 CCD’s

  • Package: MSCRED

    • Calibration: XTCOEFF

    • Application: XTALKCOR (done in PIREDUCE)

  • Commissioning: Needs redoing for all 4 gain/ speed combinations

Ast 920 Meeting 8


Configuration data mosaicing

Configuration Data - Mosaicing

  • PFISgeom orientation of CCD's in mosaic

    # PFIS CCD Geometry data

    # Date gap xshift(1) yshift(1) rot(1) xshift(3) yshift(3) rot(3)

    2004-01-01 90 -14.53 1.84 0.0931 2.35 0.84 -0.0337

    • gap: nominal gap (columns) between ccd’s (unbinned pixels)

    • coordinate system: CCD 2

    • xshift: col shift (unbinned pixels) from nominal

    • yshift: row shift “

    • rotation: clockwise rotation of CCD (degrees)

  • Recently updated using image of cartesian grid drilled by slitmask cutter. Can be updated using residuals from dispersion curves of spectra

Ast 920 Meeting 8


Configuration data distortion

Configuration Data - Distortion

5 mm cartesion grid

  • PFISdistortion correct pincushion distortion of collimator

    R/Rmax = r/rmax + A (r/rmax)3 + B (r/rmax)5

    where Rmax, A and B are weak functions of wavelength:

    Rmax (λ) = R0 + R1λ + R2 / λ2 + R3 / λ3

    A(λ) = A0 + A1 / λ + A2 / λ2

    B(λ) = B0 + B1 / λ + B2 / λ2

    6 of the 10 coefficients are also functions of temperature: f(T) = f + ft (Th – T) / (Th –Tc)(Th =20; Tc=-5)

  • Commissioning: needs to be rechecked using telescope calibration system

    # PFIS Optical Distortion and Alignment Data

    # mm/4' Rm0 Rm1 Rm2 Rm3 Rm0t Rm2t

    Rmax 27.6485 0.4246 0.0620 -0.0150 0.0165 -0.0012

    #

    # norm@ 4' A0 A1 A2 A0t A1t

    Cubic 0.013283 0.000296 -0.000273 0.000104 -0.000010

    #

    # norm@ 4' B0 B1 B2 B0t B1t

    Fifth 0.008488 -0.000716 0.000167 0.000095 -0.000024

    #

    # pup dia P0 P1 P2

    Pupil 150.38638 -0.483418 0.184229

    # Alignment

    # Date dxd dyd rot dxc dyc

    # [pix] [pix] [arcmin] [pix] [pix]

    2004-01-01 -0.749 -13.776 -7.356 0.0 0.0

    2005-06-01 8.572 -34.740 -8.691 -34.647 15.043

errors to fit to distortion and mosaic geometry x 300

Ast 920 Meeting 8


Configuration data gratings

Configuration Data - Gratings

  • PFISgratings. grating list with alignment calibration

    # PFIS Gratings 23 March, 2005

    # (Super)Blaze Simul Wavel Alignment

    # Grating Ruling wavel R coverage interval Rot Tip

    # [id] [lines/mm] [nm] [nm] [nm] ['] [']

    PG0300 300 520 350 500 380 1050 2.59 0

    PG0900 902.30 634 1330 308 320 1050 0.03 -2.99

    PG1300 1299.61 500 1550 210 350 1050 0.75 1.12

    PG1800 1801.28 624 3030 133 400 930 0.75 2.07

    PG2300 2301.36 480 3000 105 320 730 0.35 0.82

    PG3000 2999.98 366 2800 81 320 560 -0.95 1.68

    #

    # Articulation Station Error (pixels)

    # Station Xerr Yerr

    # [deg] [pix] [pix]

    1.75 10.2-0.73

    2.50 10.2-1.05

    3.25 10.2-1.36

    4.00 10.2-1.67

    4.75 10.2-1.98

    5.50 10.2-2.29

  • Commissioning: Articulation Station error needs to be calibrated, all stations

Ast 920 Meeting 8


Configuration data distortion1

Configuration Data - Distortion

  • /linelists. linelists for calibration lamps: Xe, Ne, HgAr

    • Commissioning: these need to be culled

  • PFISfilters. filter list with pointers to transmission curves in /filters

  • /masks. mask definition files: Subject for next time!

Ast 920 Meeting 8


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