Differences between revisions 22 and 23
Revision 22 as of 2007-03-09 13:33:19
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Revision 23 as of 2007-03-10 20:49:33
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  * Conversion chopper position - angle on the sky - FPU angle :
     || FPU Angle || Sky Angle || Chopper pos ||  Comment ||
     || - 8.5 deg || -6.32 arcmin || -21350 || center CS1 (determined from PHOTO FoV map) ||
     || -4 deg || -2.97 arcmin || -12101 || ||
     || 0 deg || 0 arcmin || 664 || Optical zero - value from Zeiss measurements ||
     || +4 deg || 2.97 arcmin || 12431 || ||
     || + 8.5 deg || 6.32
arcmin || +21200 || center CS2 (determined from PHOTO FoV map) ||
  * Conversion chopper position - angle on the sky - FPU angle
     || FPU Angle || Sky Angle || Chopper pos || Comment ||
     || -7.6 deg || -5.8 arcmin || -21350 || center CS1 (determined from PHOTO FoV map) ||
     || -2.2 deg || -1.8 arcmin || -6700 || Photometer chop field A ||
     ||  0.2 deg || 0 arcmin || 664 || Optical zero - value from Zeiss measurements ||
     ||  2.7 deg || 1.8 arcmin || 8000 || Photometer chop field B ||
     || 7
.9 deg || 5.7 arcmin || +21200 || center CS2 (determined from PHOTO FoV map) ||
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# conversion FPU angles in degrees
# to chopper readouts (assuming optical zero of 664 based on Zeiss measurements):
print 664 + fpuAngle2ChopPosPol(Double1d([-4, 0, 4]))
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# conversion chopper readouts to sky angle
# in arcmin : scaling factor 80.69
print chopPos2FpuAnglePol(Double1d([-12101, 0, 12431])))*60./80.69
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)
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   * 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 ||
   || 2.7 deg || 209 || 417 || 614 ||
   || 7.9 deg (CS2) || 151 || 302 || 445 ||

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:

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
    • FPU Angle

      Sky Angle

      Chopper pos

      Comment

      -7.6 deg

      -5.8 arcmin

      -21350

      center CS1 (determined from PHOTO FoV map)

      -2.2 deg

      -1.8 arcmin

      -6700

      Photometer chop field A

      0.2 deg

      0 arcmin

      664

      Optical zero - value from Zeiss measurements

      2.7 deg

      1.8 arcmin

      8000

      Photometer chop field 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

      2.7 deg

      209

      417

      614

      7.9 deg (CS2)

      151

      302

      445

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 : - TBD
  • CS2
    • 58 Ohm = 60K
    • Chopper position center : + TBD

XY stage

  • Scale: 1" on the sky = 0.18mm
  • Spectrometer
    • Focus : +5mm (from FMILT-1, not incompatible with spectro FMILT-2)
    • 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)
    • Center field :
      • x = 4 mm
      • y = 0

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