T. Belenguer, M. A. Alcacera, A. Aricha, A. Balado, J. Barandiarán, A. Bernardo, M. R. Canchal, M. Colombo, E. Diaz, V. Eiriz, I. Figueroa, G. García, A. Giménez, L. González, F. Herrada, A. Jiménez, R. López, M. Menéndez, M. Reina, J. A. Rodríguez, A. Sánchez
KEYWORDS: Space telescopes, James Webb Space Telescope, Mirrors, Telescopes, Device simulation, Integrating spheres, Control systems, Molybdenum, Imaging systems, Interfaces
The MTS, MIRI Telescope Simulator, is developed by INTA as the Spanish contribution of
MIRI (Mid InfraRed Instrument) on board JWST (James Web Space Telescope).
The MTS is considered as optical equipment which is part of Optical Ground Support
Equipment for the AIV/Calibration phase of the instrument at Rutherford Appleton
Laboratory, UK.
It is an optical simulator of the JWST Telescope, which will provide a diffractionlimited test
beam, including the obscuration and mask pattern, in all the MIRI FOV and in all defocusing
range. The MTS will have to stand an environment similar to the flight conditions (35K) but
using a smaller set-up, typically at lab scales.
The MTS will be used to verify MIRI instrument-level tests, based on checking the
implementation/realisation of the interfaces and performances, as well as the instrument
properties not subject to interface control such as overall transmission of various modes of
operation.
This paper includes a functional description and a summary of the development status.
F. Herrada, V. Eiriz, M. Alcacera, A. Aricha, A. Balado, J. Barandiaran, T. Berenguer, E. Diaz, I. Figueroa, L. Gonzalez, R. Lopez, M. Menendez, A. Bernardo, M. Reina, A. Sanchez, G. Garcia, A. Jimenez, M. Colombo, M. Canchal, J. Rodriguez
MTS (MIRI telescope simulator) is the Spanish contribution to the JWST Project. MTS is a part of the
Optical Ground Support Equipment (OGSE) for the Assembly Integration and Verification (AIV) and
Calibration phase of the MIRI instrument at the RAL (Rutherford Appleton Laboratory) facilities. Briefly,
MTS main objetive consists on delivering a diffraction-limited test beam, including the obscuration and
mask pattern, to the MIRI instrument that reproduces the output beam of the JWST in environmental
conditions similar to those corresponding to the flight.
In this work, the current status of the project is reported on. Mainly, after a description of the whole
instrument and the optomechanical performances required, the paper will be focused on the current status
of the purchase and characterization of certain critical elements belonging to the different subsystems.
The first step has been the verification of the thermoelastic behaviour of its structure, employing a
mass prototype. Both extensometer measurements and optical measurements with alignment mirror cubes
have been carried out during a thermal vacuum test of this MTS prototype. The correlation of the
measurements, optically and mechanically, will provide a better knowledge of the structure behavior and
will be used to define the integration process.
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