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LIRIS filters, grisms, prisms, slits and pupils

LIRIS has two filter wheels (FW1, FW2), a slit wheel (SW), a grism wheel (GW) and a pupil wheel (PW). The current configuration of each is given below. Dummies in the wheels are not explicitly listed. Filters in the filter wheels are inclined by 5 degrees in order to suppress reflections in the image. The green commands explain how to move a wheel independently of the others.

Note: The R=2500 grism for K appears less efficient than expected. It might be replaced by a different grism.

Note: Coronographic mode has not yet been fully characterised. It is not availble in 2007A, since the coronographic mask was removed to make space for a MOS mask.
Filter wheel configuration          lfwheel[1|2] <filter name>
Filter name Wheel and Pos. Cut-on [μm] Cut-off [μm] Transmission
z FW2 - 9 0.996 1.069 cold      data
j FW2 - 10 1.170 1.330 cold      data
h FW2 - 5 1.490 1.780 cold      data
ks FW2 - 2 1.990 2.310 cold      data
brg FW2 - 7 2.150 2.182 cold      data
kc FW2 - 12 2.253 2.287 cold      data
hc FW1 - 11 1.558 1.582 cold      data
jc FW1 - 12 1.216 1.244 cold      data
fe2 FW1 - 5 1.632 1.656 cold      data
pabeta FW1 - 6 1.277 1.310 cold      data
h2v10 FW1 - 10 2.106 2.138 cold      data
h2v21 FW1 - 4 2.231 2.265 cold      data
ch4 FW1 - 3 1.640 1.740 cold      data
he1 FW2 - 6 2.043 2.073 cold      data
hkspec FW2 - 3 1.4 2.5 warm      data
ucm FW1 - 9 1.177 1.186 cold
ucm is a private filter. Contact
Jesus Gallego before using it.
wdwspec FW1 - 1    -    - Spectropolarimetry
clear FW1 - 8    -    -    -
clear FW2 - 4    -    -    -
Slit wheel configuration          lslit <slit mask name>
Slit mask name Wheel and Pos. Type Width Remarks
l0p65 SW - 3 Long slit 0.65"
l0p75 SW - 4 Long slit 0.75"
l1 SW - 5 Long slit 1.0"
l0p75ext SW - 6 Long slit 0.75" Offset of 100 pixels between lower and
upper half of the slit in dispersion
direction, for greater spectral coverage.
l5 SW - 7 Long slit 5.0"
various SW - 1, 2, 8,
SW - 10, 13, 14		 Multi slit masks    -
l0p75f0p25 SW - 9    -    -
patron 900 SW - 16    -    - Pinhole mask
clear0p25 SW - 12    -    -
clear SW - 15    -    - Clear aperture
blank SW - 11    -    - Blocked light path
Grism wheel configuration          lgrism <grism name> [<slit name>]
Grism name Wheel and Pos. Wavelength Resolution Remarks
lrhk12tl10 GW - 1 H - K R = 700 Inclination angle:   10° don't use
lrhk GW - 2 H - K R = 700 Inclination angle:   0°
lrzj8 GW - 7 z - J R = 700 Inclination angle:   0°
lrzj9tl5 GW - 8 z - J R = 700 Inclination angle:   5° don't use
mrk GW - 10 K R = 2500 Inclination angle:   0°
wdw_image GW - 6    -    - Imaging polarimetry
clear GW - 9    -    - Clear aperture
Pupil wheel configuration          lpupil <pupil name>
Pupil name Wheel and Pos. Purpose and remarks
pshortbr PW - 1 Short wavelength, broad band filters; lrzj8 grism;
pcblnkxl PW - 2 Long wavelength, broad band; lrhk grism; 10mm shield for M2
plongmd PW - 3 Long wavelength, medium band filters
pcoron PW - 4 Coronographic mode
phdhart PW - 6 Hartmann mask
pshortbru PW - 7 2% smaller area than pshortbr
pcblnk PW - 8 Like pcblnkxl, but with 8.83mm shield for M2
plongmidu PW - 9 2% smaller than plongmd
pcentnr PW - 11 Narrow band filters
pvdhart PW - 12 Hartmann mask
clear PW - 5 Clear aperture
blank PW - 10 Blocked light path
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Last Updated: 11 Jan 2007
Mischa Schirmer ( )