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 *
    # conversion FPU angles in degrees 
    #to chopper readouts:
    print (664??? +) fpuAngle2ChopPosPol(Double1d([-4, 0, 4]))
    
    # conversion chopper readouts to sky angle
    # in arcmin : scaling factor 80.69
    print chopPos2FpuAnglePol(Double1d([-12101, 0, 12431])))*60./80.69
    
    
    #664???: optical zero, not known yet, must first 
    #be defined and measured!
    #664 is the best guess for the optical zero
    #using Zeiss measurements.
    #you get angles referred to the mechanical zero
    #by using chopPos2FpuAnglePol

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