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 : -23000 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
    - 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

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

  • from all import *
    # 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
    
    
    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

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 = -12.8 mm
    • y = +1.2 mm
• Photometer
  • Focus : +5mm (from FMILT-1)
  • Center field :
    • x = 4 mm
    • y = 0