= FM ILT reference numbers = == Ge:Ga detector settings == * Blue || par || value || comment || || Bias d || 198 mV || Bias / heater loop test shows that 168 is slightly better, but 198 used throughout ILT || || Bias r || 10 mV || Component level value - to be verified on CRE checkout test || || Heater || 1.5 mA || Result from bias / heater loop test is 2.49 K || * 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 || * Capacitance || Decimal || bits || Capacitance (fF) || Ratio || || 0 || 00 || 140 || 1 || || 8 || 10 || 240 || 1.71 || || 4 || 01 || 450 || 3.21 || || 12 || 11 || 1150 || 8.21 || == Grating == * Configuration table: CONFGrat. Column : FMILTFast / FMILT_R_Fast for redundant * Allowed working range : * 32K - 1064K (nominal) * 50K - 1082K (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 || * Key wavelength positions || Grating position || Wave Red || Wave Blue Fil A n=3 || Wave Blue Fil A n=2 || Wave Blue Fil B n=2 || || 794000 || 142.43 || || || 71.22 || || 535000 || 175.63 || 58.55 || || 87.82 || || 461000 || 183.96 || 61.32 || || 91.99 || * 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 relevant for Photometer || FPU Angle || Sky Angle || Chopper pos || Comment || || -7.57 deg || -5.79 arcmin || -21350 || center CS1 (determined from PHOTO FoV map) || || -2.14 deg || -105 arcsec || -6578 || Photometer chop A || || -0.37 deg || -26 arcsec || -1131 || Photometer chop field A (point source photometry) || || 0.22 deg || 0 arcsec || 664 || Optical zero - value from Zeiss measurements || || 0.80 deg || 26 arcsec || 2450 || Photometer chop field B (point source photometry) || || 2.57 deg || 105 arcsec || 7756 || Photometer chop B || || 7.94 deg || 5.74 arcmin || 21200 || center CS2 (determined from PHOTO FoV map) || * Conversion chopper position - angle on the sky - FPU angle relevant for Spectrometer || FPU Angle || Sky Angle || Chopper pos || Comment || || -7.57 deg || -5.79 arcmin || -21350 || center CS1 (determined from PHOTO FoV map) || || || -3 arcmin || -11580 || large chopper throw A || || || -1.5 arcmin || -5552 || medium chopper throw A || || || -0.5 arcmin || -1408 || small chopper throw A || || 0.22 deg || 0 arcmin || 664 || Optical zero - value from Zeiss measurements || || || 0.5 arcmin || 2724 || small chopper throw B || || || 1.5 arcmin || 6769 || medium chopper throw B || || || 3 arcmin || 12444 || large chopper throw B || || 7.94 deg || 5.74 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 chopPos2SkyAngle(chopPositions) # FPU angles (deg) to Chopper positions fpuAngles = Double1d([-4, 4]) print fpuAngle2ChopPosPol(fpuAngles) # Sky angles (arcmin) to Chopper positions skyAngles = Double1d([-3, 3]) print skyAngle2ChopPos(skyAngles) }}} * 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) || 164 || 328 || 481 || || -6700 || 218 || 437 || 641 || || 664 || 221 || 441 || 648 || || 8000 || 209 || 417 || 613 || || 21200 (CS2) || 150 || 300 || 441 || * 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 = convertChopperAngleSteps(chopPos,bluePhotSky * 80.69/60.]) 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 * Temperature - resistance conversion: * [[attachment:Calsource_T_R_Conversion.txt]] (left column: Temp in K; right column: Resistor Value in Ohm) == Saturating OGSE BB temperatures == In the following tables you find OGSE Blackbody temperatures for which one can expect saturation in the spectrometer. The estimates are done for 0.25s ramps. Blue detector || Capacitance || 0 || 8 || 4 || 12 || || || 0.14 || 0.23 || 0.43 || 1.09 || || 60 micron (order 2) || 50 || 54 || 67 || - || || 60 micron (order 3) || 60 || - || - || - || || 75 micron || 51 || 58 || 70 || - || Red detector || Capacitance || 0 || 8 || 4 || 12 || || || 0.28 || 0.41 || 0.68 || 1.42 || || 130 micron || 27.5 || 30.5 || 35 || 44.5 || It is assumed that the saturation level happens at 30,000 ADC/ramp. When no temperature is given in the Table it means that it is above 60K. == 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