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X-SHOOTER Spectrograph

X-SHOOTER is a spectrograph that has a high efficiency and medium resolution (4000-14000 depending on the slit width and wavelength) that will allow to cover at the same time the whole spectral range from the atmospheric cut-off in the UV (300 nm) up to the near infrared (1.9 micron). To accomplish this the spectrograph consists of three spectrographs, one for the UV and blue, one for the visible and red band and the last one for the infrared band. The tasks that our group will have to perform for the X-SHOOTER instrument are focused on "Detectors", "Detectors' control", "Movements control", "Integration of the electronics and of the detectors in the instruments" and finally "Test". Our group will perform procedures to test and characterize the CCD detectors and their control electronics (FIERA controller) in collaboration with ESO. Furthermore we will have the responsibility of:

a)
the integration of the control electronics for movements
b)
the integration of the CCD detector and of its control electronics for the red arm of the instrument.
This last task will be done in strict collaboration with the Milano observatory where the integration of the red arm of the spectrograph will be performed. To measure the main parameters of the CCD detectors our group will use the instrumental apparatus for detectors optical characterization at the Catania Astrophysical Observatory. This apparatus allow the full optical characterization of an imaging detectors in the wavelength range 125-1100nm. The research program of this particular task will consist of:
  1. measurements of geometric resolution
  2. measurements of linearity and uniformity at both low and high level photon fluxes
  3. measurements of charge transfer efficiency
  4. measurements of dark current and cosmetics (hot and dark pixels)
  5. measurements of quantum efficiency in the wavelength range 300-1100nm
We will investigate the temperature dependence of some of these parameters. Further tests will be performed on the electronics that acquires and controls the signal and on the detector's management software. The final part of the program will deal with the integration of the controller-detectors system into the instrument. This phase will take place at the site where the integration will be carried out.


next up previous contents index
Next: CCD cameras for the Up: Participation in National and Previous: RATS project   Contents   Index
Innocenza Busa' 2005-11-14