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18. 10.90
PROJECT DIVISION OPTICAL INSTRUMENTATION
TECHNICAL MEMORANDUM 09-10-1990
EFFICIENCY CURVES OF EMMI IN THE SPECTROSCOPIC
AND DIRECT IMAGING MODES
Computed with
the EMMI/EFOSC2 Numerical Simulator
J .-L. Prieur and G. Rupprecht
A new MIDAS context allows the simulation of observations with EMMI on the NTT (for details see The Messenger, 58, 60). We have used this numerical simulator to compute the overall transfer efficiency (OTE) of EMMI in the spectroscopic and direct imaging modes with the 6 grisms, 8 gratings, and 3 cameras available (f/2.5 and f/5.3 for the channel R, and f/4.0 for B).
In the calculations the following parameters have been taken into account: • atmospheric transmission for La Silla (we assumed an air mass of one, cf. Fig. 42) • reflection by the 3 NTT mirrors, all coated with aluminum (the reflectivity of a
sample mirror with a 4 month-old aluminization is shown in Fig. 43) • the central obscuration of the main mirror due to the secondary (which is 11 %
for the NTT) • the measured transmission of the EMMI optics in the corresponding configuration
. (channel Rand B, and cameras f/2.5, f/4.0, f/5.3), measured in the ESO optical laboratory, Garching (Fig. 23 to Fig. 27).
• in spectroscopy mode: the transmission of the grisms and gratings as determined in the ESO optical laboratory, Garching (Fig. 28 to Fig. 39); no filters.
• in direct imaging mode: standard Cousins filters U, B, V, R, I, z and a slightly blue shifted B filter (Bb).
• the quantum efficiency of the ESO CCD #18 for the R channel and CCD #19 for B, as measured in the ESO detector laboratory, Garching (Fig. 40 and 41). Both CCD's are front illuminated Thomson THX31156, uv-coated, with 1024xl024 squared pixels of 19J1m in width.
The unit for this OTE is e- /photon i.e. it allows to compute the output in photo-electrons from the input in photons. It can be directly compared to observational data and should prove useful for initial considerations in the planning phase of observations.
Should your own measurements show major discrepancies with the model conlPu-tation, please signal them to one of the authors at ESO Garching.
1
List of figures:
Figures 1 to 6: Overall transfer efficiency of the spectroscopic mode of EMMI (no slit loc;c;ps and air mass = 1) with grisms 1 to 6, channel R, camera f/2.5, and CCD #18. The wavelength range provided by this CCD is indicated by a thick line on the x aXlS.
Figures 7 to 12: Overall transfer efficiency of the spectroscopic mode of EMMI (no slit losses and air mass = 1) with grisms 1 to 6, channel R, camera f/5.3, and CeD #18. The wavelength range provided by this CCD is indicated by a thick line on the x axis.
Figures 13 to 14: Overall transfer efficiency of the spectroscopic mode of EMMI (no slit losses and air mass = 1) with gratings 6 and 7, channel R, camera f/2.5, and CCD #18. The wavelength range provided by this CCD is indicated by a thick line on the x axis.
Figures 15 to 16: Overall transfer efficiency of the spectroscopic mode of EMMI (no slit losses and air mass = 1) with gratings 6 and 7, channel R, camera f/5.3, and CCD #18. The wavelength range provided by this CCD is indicated by a thick line on the x axis.
Figures 17 to 20: Overall transfer efficiency of the spectroscopic mode of EMMI (no slit losses and air mass = 1) with gratings 3, 4, 5 and 8, channel B, camera f/4.0, and CCD #19. The wavelength range provided by this CCD is indicated by a thick line on the x axis.
Figure 21a: Overall transfer efficiency of the spectroscopic mode of EMMI (no slit losses and air mass = 1) with echelle grating 9, cross-disperser grism 3, channel R, camera f/2.5, and CCD #18. The echelle efficiency was taken at the blaze peak; for order averaged efficiency multiply with 0.75.
Figure 21b: Same as Fig 21a, but camera f/5.3 and cross-disperser grism 3.
Figure 21e: Sanle as Fig 21a, but camera f/2.5 and cross-disperser grism 4.
Figure 21d: Same as Fig 21a, but camera f/5.3 and cross-disperser grism 4.
Figure 21e: Overall transfer efficiency of the spectroscopic mode of EMMI (no slit losses and air mass = 1) with echelle grating 10, cross-disperser grism 3, channel R, camera f/2.5, and CCD #18. The echelle efficiency was taken at the blaze peak; for order averaged efficiency multiply with 0.75.
Figure 21f: Same as Fig 21e, but camera f/5.3 and cross-disperser grism 3.
Figure 21g: Same as Fig 21e, but camera f/2.5 and cross-disperser grism 4.
Figure 21b: Same as Fig 21e, but camera f/5.3 and cross-disperser grism 4.
2
Figure 22a: Overall transfer efficiency of the direct imaging mode of EMMI ill channels Band R at airmass 1, comparing ESO filters U and B (blue arm) with Bb, V, R, I, z (red arm with camera f/2.5)
Figure 22b: Same as Fig 22a, but red camera f/5.3.
Figure 22c: Overall transfer efficiency of the EMMI blue arm in direct imaging mode at airmass 1, comparing ESO filters U and B.
Figure 23: Transmission of the optics of EMMI for channel R, camera f/2.5, grism spectroscopy mode.
Figure 24: Transmission of the optics of EMMI for channel R, camera f/2.5, grating spectroscopy mode.
Figure 25: Transmission of the optics of EMMI for channel R, camera f/5.3, grism spectroscopy mode.
Figure 26: Transmission of the optics of EMMI for channel R, camera f/5.3, grating spectroscopy mode.
Figure 27: Transmission of the optics of EMMI for channel B, camera f/4.0, grating spectroscopy mode.
Figures 28 to 33: Transmission of grisms 1 to 6.
Figures 34 to 39: Efficiency of gratings 3 to 8.
Figure 40: Quantum efficiency of CCD #18 (channel R)
Figure 41: Quantum efficiency of CCD #19 (channel B)
Figure 42: Atmospheric transmission on La Silla (air mass = 1).
Figure 43: Aluminum reflectivity (4-month old aluminization).
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