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  * Key wavelength positions
     || Grating position || Wave Red || Wave Blue Fil A n=3 || Wave Blue Fil A n=2 || Wave Blue Fil B n=2 ||
     || 794000 || 142.43 || || || 71.22 ||
     || 535000 || 175.63 || 58.55 || || 87.82
     || 461000 || 183.96 || 61.32 || || 91.99 ||

FM ILT reference numbers

Ge:Ga detector settings

  • Blue
    • par

      value

      comment

      Bias d

      168 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 is 2.49 K

  • 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

  • Capacitance
    • Decimal

      bits

      Capacitance (fF)

      Ratio

      0

      00

      140

      1

      8

      10

      230

      1.64

      4

      01

      430

      3.07

      12

      11

      1090

      7.79

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

  • Key wavelength positions
    • Grating position

      Wave Red

      Wave Blue Fil A n=3

      Wave Blue Fil A n=2

      Wave Blue Fil B n=2

      794000

      142.43

      71.22

      ||

      535000 || 175.63 || 58.55 || || 87.82

      461000

      183.96

      61.32

      91.99

  • 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

      -7.57 deg

      -5.79 arcmin

      -21350

      center CS1 (determined from PHOTO FoV map)

      -2.14 deg

      -105 arcsec

      -6578

      Photometer chop A

      -0.37 deg

      -26 arcsec

      -1131

      Photometer chop field A (point source photometry)

      0.22 deg

      0 arcsec

      664

      Optical zero - value from Zeiss measurements

      0.80 deg

      26 arcsec

      2450

      Photometer chop field B (point source photometry)

      2.57 deg

      105 arcsec

      7756

      Photometer chop B

      7.94 deg

      5.74 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

      -7.57 deg

      -5.79 arcmin

      -21350

      center CS1 (determined from PHOTO FoV map)

      -3 arcmin

      -11580

      large chopper throw A

      -1.5 arcmin

      -5552

      medium chopper throw A

      -0.5 arcmin

      -1408

      small chopper throw A

      0.22 deg

      0 arcmin

      664

      Optical zero - value from Zeiss measurements

      0.5 arcmin

      2724

      small chopper throw B

      1.5 arcmin

      6769

      medium chopper throw B

      3 arcmin

      12444

      large chopper throw B

      7.94 deg

      5.74 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 chopPos2SkyAngle(chopPositions)
        
        
        # FPU angles (deg) to Chopper positions
        fpuAngles = Double1d([-4, 4])
        print fpuAngle2ChopPosPol(fpuAngles)
        
        # Sky angles (arcmin) to Chopper positions
        skyAngles = Double1d([-3, 3])
        print skyAngle2ChopPos(skyAngles)
    • 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)

        164

        328

        481

        -6700

        218

        437

        641

        664

        221

        441

        648

        8000

        209

        417

        613

        21200 (CS2)

        150

        300

        441

    • 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 = convertChopperAngleSteps(chopPos,bluePhotSky * 80.69/60.])
               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
  • Temperature - resistance conversion:
    • attachment:Calsource_T_R_Conversion.txt

Saturating OGSE BB temperatures

In the following tables you find OGSE Blackbody temperatures for which one can expect saturation in the spectrometer. The estimates are done for 0.25s ramps.

Blue detector

Capacitance

0

8

4

12

0.14

0.23

0.43

1.09

60 micron (order 2)

50

54

67

-

60 micron (order 3)

60

-

-

-

75 micron

51

58

70

-

Red detector

Capacitance

0

8

4

12

0.28

0.41

0.68

1.42

130 micron

27.5

30.5

35

44.5

It is assumed that the saturation level happens at 30,000 ADC/ramp.

When no temperature is given in the Table it means that it is above 60K.

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)