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Revision 29 as of 2007-03-12 17:58:07
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Revision 30 as of 2007-03-12 18:02:55
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     || 2.6 deg || 1.8 arcmin || 7660 || Photometer chop field B ||      || 2.6 deg || 1.8 arcmin || 7660 || Photometer chop field B (raster) ||

FM ILT reference numbers

Ge:Ga detector settings

  • Blue
    • par

      value

      comment

      Bias d

      198 mV

      From bias / heater loop test

      Bias r

      10 mV

      Component level value - to be verified on CRE checkout test

      Heater

      1.5 mA

      Result from bias / heater loop test (2.68K/1.84mA) exceeds thermal budget

  • Red
    • par

      value

      comment

      Bias d

      69 mV

      From bias / heater loop test

      Bias r

      10 mV

      Component level value - to be verified on CRE checkout test

Grating

  • Configuration table: CONFGrat. Column : FMILTFast / FMILT_R_Fast for redundant
  • Allowed working range :
    • 45K - 1045K (nominal)
    • 65K - 1065K (redundant)
  • Conversion wavelength - grating position (based on ILT-1) :
    • Band

      Order

      Filter

      wavelength

      Grating position

      R1

      1

      n/a

      210um

      96K

      100um

      991K

      B2B

      2

      B

      100um

      301K

      70um

      812K

      B2A

      2

      A

      70um

      812K

      53um

      1040K

      B3A

      3

      A

      70um

      183K

      50um

      740K

  • Other wavelengths in the PCSS:
    • from spec import *
      
      print wave2GratPos(105., "B2", 8, calVersion="FM_1_0")
      print gratPos2Wave(1000000, "B2", 8, calversion="FM_1_0")

Chopper

  • !!! Do NOT use the chopper in redundant mode !!!
  • Configuration table CONFChopper / column : CSLopt3-600
  • Accessible range : -23500 to +23000
    • At +/- 25000 a field plate limit disables the controller
  • Conversion chopper position - angle on the sky - FPU angle relevant for Photometer
    • FPU Angle

      Sky Angle

      Chopper pos

      Comment

      -7.6 deg

      -5.8 arcmin

      -21350

      center CS1 (determined from PHOTO FoV map)

      -2.1 deg

      -1.75 arcmin

      -6830

      Photometer chop field A (raster)

      -0.37 deg

      -26 arcsec

      -1145

      Photometer chop field A (point source photometry)

      0.2 deg

      0 arcmin

      664

      Optical zero - value from Zeiss measurements

      0.8 deg

      26 arcsec

      2440

      Photometer chop field B (point source photometry)

      2.6 deg

      1.8 arcmin

      7660

      Photometer chop field B (raster)

      7.9 deg

      5.7 arcmin

      21200

      center CS2 (determined from PHOTO FoV map)

  • Conversion chopper position - angle on the sky - FPU angle relevant for Spectrometer
    • FPU Angle

      Sky Angle

      Chopper pos

      Comment

      -7.6 deg

      -5.8 arcmin

      -21350

      center CS1 (determined from PHOTO FoV map)

      -3.8 deg

      -3 arcmin

      -12220

      large chopper throw A

      -1.8 deg

      -1.5 arcmin

      -5743

      medium chopper throw A

      -0.46 deg

      -0.5 arcmin

      -1442

      small chopper throw A

      0.2 deg

      0 arcmin

      664

      Optical zero - value from Zeiss measurements

      0.89 deg

      0.5 arcmin

      2727

      small chopper throw B

      2.25 deg

      1.5 arcmin

      6704

      medium chopper throw B

      4.3 deg

      3 arcmin

      12260

      large chopper throw B

      7.9 deg

      5.7 arcmin

      21200

      center CS2 (determined from PHOTO FoV map)

    • Other angles - in the PCSS (release >20070303A) :

      • from all import *
        
        chopPositions = Double1d([-21350.,-6700., 664., 8000., +21200.]) # CS1, PhotLeft, Center, PhotRight, CS2
        
        # Chopper positions to FPU angles (deg)
        print chopPos2FpuAnglePol(chopPositions)
        
        # Chopper positions to Sky angles (arcmin)
        print chopPos2FpuAnglePol(chopPositions-664)*60/80.69
        
        
        # FPU angles (deg) to Chopper positions
        fpuAngles = Double1d([-4, 4])
        print fpuAngle2ChopPosPol(fpuAngles)
        
        # Sky angles (arcmin) to Chopper positions
        skyAngles = Double1d([-3, 3])
        print 664 + fpuAngle2ChopPosPol(skyAngles/60*80.69)
    • Chopper step to move over one pixel - depends on chopper position
      • Chop pos

        Blue phot (3.2")

        Red phot (6.4")

        Spectro (9.4")

        -21350 (CS1)

        163

        325

        476

        -6700

        218

        436

        640

        664

        221

        441

        648

        8000

        209

        417

        614

        21200 (CS2)

        151

        302

        445

    • At other positions - in the PCSS (release >20070303A):

      •        bluePhotSky = 3.2 # Blue photometer pixel on the sky (arcsec)
               fpuAngle = -7.6   # degrees - chopper angle at which to calculate the delta position
               chopPos = fpuAngle2ChopPosPol(Double1d([fpuAngle]))
               offsetChopPos = fpuAngle2ChopPosPol(Double1d([fpuAngle - bluePhotSky * 80.69/3600])
               print offsetChopPos

Filter Wheel PHOT

  • POS A = Long wavelength (Green)
  • POS B = Short wavelength (Blue)

Filter Wheel SPEC

  • POS A = Short wavelength (50-70um)
  • POS B = Long wavelength (70-100um)

Calibration sources

  • CS1
    • 48 Ohm = 55K
    • Chopper position center : -21350
  • CS2
    • 58 Ohm = 60K
    • Chopper position center : +21200

XY stage

  • Scale: 1" on the sky = 0.18mm
  • Spectrometer
    • Focus : +5mm (from FMILT-1, not incompatible with spectro FMILT-2)
    • 1 pixel = 9.4" = 1.692mm
    • Center spectro field :
      • X stage (mm)

        Y stage (mm)

        RED

        -12.7628

        0.938300

        BLUE

        -12.6774

        1.15180

  • Photometer
    • Focus : +5mm (from FMILT-1)
    • 1 blue pixel = 3.2" = 0.576mm
    • 1 red pixel = 6.4" = 1.152mm
    • Center field :
      • x = 4 mm
      • y = 1.5

Herschel: FmIltProc/ReferenceNumbers (last edited 2009-07-15 14:32:37 by localhost)