Combination of optics for each observing mode
 
2002.1.10 created by Y. Okamoto
2003.8.14 modified by H. Kataza

 
Using the SOSS commands, you should only specify the observing modes to select a slit, a lens, filters, and a grating. However, it will be useful if you understand normal combinations of the optics. You can specify some different combination under your special observing request. In that case, you must specify filters and other optical modules.

Imaging in the N-band
Name Fore-Optics Slit Imaging Optics
fore-filter 1 fore-filter 2 Lens imaging filter
FILTER01 FILTER02 SLIT FILTER04 FILTER03
N8.8 F01C10.50W6.00 H21 S01W000 L01L10I F05C08.70W0.80
N9.7 F01C10.50W6.00 H21 S01W000 L01L10I F06C09.80W0.90
N10.5 F01C10.50W6.00 H21 S01W000 L01L10I F07C10.30W1.05
N11.7 F01C10.50W6.00 H21 S01W000 L01L10I F08C11.60W1.10
N12.4 F01C10.50W6.00 H21 S01W000 L01L10I F09C12.50W1.15
UIR8.6 H13 F22C08.60W0.43 S01W000 L01L10I H01
UIR11.2 H13 F29C11.30W0.60 S01W000 L01L10I H01
Ar8.99 H13 F23C08.99W0.13 S01W000 L01L10I H01
S10.5 F26C10.52W0.16 H21 S01W000 L01L10I H01
Ne12.8 F30C12.81W0.20 H21 S01W000 L01L10I H01
NeRef13.1 H13 H21 S01W000 L01L10I F32C13.10W0.20
You may remove the N-wide filter (F01C10.50W6.00) at the fore-optics filter wheel. However, the slow readout method different from the original design, which is employed to avoid non-linear response of the detectors, causes too rapid saturation of the detectors without the N-wide filter. When you observe with some narrow band filters at fore-optics filter wheel, you sometimes can't choose N-wide for fore-filter because it is installed in the same filter wheel as the filter you want.

Imaging in the Q-band
Name Fore-Optics Slit Imaging Optics
fore-filter 1 fore-filter 2 Lens imaging filter
FILTER01 FILTER02 SLIT FILTER04 FILTER03
Q16.6 H13 H21 S01W000 L02L20I F33C16.50W0.40
Q17.7 H13 H21 S01W000 L02L20I F36C17.65W0.90
Q18.8 F17C19.00W3.80 H21 S01W000 L02L20I F37C18.75W0.85
Q20.8 H13 H21 S01W000 L02L20I F13C20.80W0.90
Q24.5 H13 H21 S01W000 L02L20I F11C24.50W2.20
You may put some Q-wide filters at the fore-optics filter wheels in addition to the imaging filters. Although you may also use the Q-wide filters at the fore-optics filter wheels without the Q-band imaging filters, it will lead to rapid saturation of detectores and you may required to reduce the real integration time (observing efficiency) without changing the real observing time.

Low-resolution (R250) spectroscopy in the N-band
Name Fore-Optics Slit Imaging Optics (Slit Viewer) Grating Grating position
fore-filter 1 fore-filter 2 Lens imaging filter
FILTER01 FILTER02 SLIT FILTER04 FILTER03 DISPERSR Q_GRTPOS
NL N8.8 F01C10.50W6.00 H21 S02W160 or S03W240 L01L10I F05C08.70W0.80 G01L10L around 9700
N9.7 F06C09.80W0.90
N10.5 F07C10.30W1.05
N11.7 F08C11.60W1.10
N12.4 F09C12.50W1.15
S02W160 has 0.16 arcsec width and S03W240 has 0.24 arcsec width. S03W240 causes the loss of spectral resolution.

Medium-resolution (R2500) spectroscopy in the N-band
Name Fore-Optics Slit Imaging Optics (Slit Viewer) Grating Grating position
fore-filter 1 fore-filter 2 Lens imaging filter
FILTER01 FILTER02 SLIT FILTER04 FILTER03 DISPERSR Q_GRTPOS
NM N8.8 F01C10.50W6.00 H21 S02W160 or S03W240 L01L10I F05C08.70W0.80 G02L10M  
N9.7 F06C09.80W0.90
N10.5 F07C10.30W1.05
N11.7 F08C11.60W1.10
N12.4 F09C12.50W1.15
S02W160 has 0.16 arcsec width and S03W240 has 0.24 arcsec width. S03W240 causes the loss of spectral resolution.

High-resolution (R10000) spectroscopy in the N-band
Name Fore-Optics Slit Imaging Optics (Slit Viewer) Grating Grating position
fore-filter 1 fore-filter 2 Lens imaging filter
FILTER01 FILTER02 SLIT FILTER04 FILTER03 DISPERSR Q_GRTPOS
NH Ar H13 F23C08.99W0.13 S02W160 or S03W240 L01L10I H01 G03L10H  
S F26C10.52W0.16 H21  
Ne F30C12.81W0.20 H21  
S02W160 has 0.16 arcsec width and S03W240 has 0.24 arcsec width. S03W240 causes the loss of spectral resolution.

Medium-resolution (R2500) spectroscopy in the Q-band
Name Fore-Optics Slit Imaging Optics (Slit Viewer) Grating Grating position
fore-filter 1 fore-filter 2 Lens imaging filter
FILTER01 FILTER02 SLIT FILTER04 FILTER03 DISPERSR Q_GRTPOS
QM Q16.6 F17C19.00W3.80 H21 S04W320 or S05W480 L02L20I F33C16.50W0.40 G04L20M about 1760 for short, about 2045 for long
Q17.7 F36C17.65W0.90
Q18.8 F37C18.75W0.85
Q20.8 F13C20.80W0.90
Q24.5 F11C24.50W2.20
S04W320 has 0.32 arcsec width and S05W480 has 0.48 arcsec width. S04W320 causes the loss of spectral resolution.

High-resolution (R5000) spectroscopy in the Q-band
Name Fore-Optics Slit Imaging Optics (Slit Viewer) Grating Grating position
fore-filter 1 fore-filter 2 Lens imaging filter
FILTER01 FILTER02 SLIT FILTER04 FILTER03 DISPERSR Q_GRTPOS
QH   H13 F34C17.00W0.40 S04W320 or S05W480 L02L20I H01 G03L10H  
S04W320 has 0.32 arcsec width and S05W480 has 0.48 arcsec width. S04W320 causes the loss of spectral resolution.