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

  • 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