Differences between revisions 15 and 25 (spanning 10 versions)
Revision 15 as of 2007-03-08 14:56:54
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Comment:
Revision 25 as of 2007-03-10 21:00:53
Size: 4265
Comment:
Deletions are marked like this. Additions are marked like this.
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  * Accessible range : -23000 to +23000   * Accessible range : -23500 to +23000
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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 || -23382 || center CS1 ||
     || -4 deg || -2.97 arcmin || -12101 || ||
     || 0 deg || 0 arcmin || 0 || Mechanical zero ||
     || +4 deg || 2.97 arcmin || 12431 || ||
     || + 8.5 deg || 6.32 arcmin || 22347 || center CS2 ||
  * 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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# FPU angle : offset 650
print (664??? +) fpuAngle2ChopPosPol(Double1d([-4, 0, 4]))
# Sky angle : scaling factor 80.69
print ((664??? +)fpuAngle2ChopPosPol(Double1d([-4, 0, 4])))/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
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664???: optical zero, not known yet, must first be defined and measured!
you get angles referred to the mechanical zero by using fpuAngle2ChopPosPol or chopPos2FpuAnglePol, 664 is the best guess from Zeiss
# 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 ||
   || 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
    }}}
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    * Chopper position center : - TBD     * Chopper position center : -21350
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    * Chopper position center : + TBD     * Chopper position center : +21200
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    * Center spectro field :
       * x = -12.8 mm
       * y = +1.2 mm
    * 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 ||
 
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    * 1 blue pixel = 3.2" = 0.576mm
    * 1 red pixel = 6.4" = 1.152mm
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       * y = 0        * y = 1.5

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

      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)