Sin título de diapositiva - UCM

Sin título de diapositiva - UCM

NAHUAL Mechanical Concept Current Status September 02 2008 F. Javier Fuentes Instituto de Astrofsica de Canarias rea de Instrumentacin What this talk is? It is the idea a part of the Nahual Consortium has about the present state and desired future development of the mechanical architecture of the instrument. It is just a proposal for discussion. It is fully opened to all the ideas, comments, suggestions, Nahual is a very complex instrument and it is not an easy task to put it on the best design path.

It is the input to the mechanical WBS and schedule proposals. They will be presented and discussed on session 4 this meeting. F. Javier Fuentes Instituto de Astrofsica de Canarias 2 rea de Instrumentacin Science Requirements Main Mode Spectral Domain: 1 2.4 m

Spectral Resolution > 50.000 Radial Velocity Accuracy: 1 m/s (1 hr to days/months/years) Simultaneous Wavelength Calibration No moving parts F. Javier Fuentes Instituto de Astrofsica de Canarias 3 rea de Instrumentacin Science Requirements

Optional Modes Spectral Domain: 0.9 2.5 m Spectral Resolution 500 to 61.000 Long Slit / Image Slicer AO needed on some modes Wavelength Tuning

Cold mechanisms needed to change between configurations To be implemented ONLY if they are compatible with the Main Mode architecture/functionality/operation F. Javier Fuentes Instituto de Astrofsica de Canarias 4 rea de Instrumentacin Mechanical Functional Baseline Main Mode Working Temperature < 100 K (cryogenic environment)

Image Stability 0.1 to 0.01 pixel According the Radial Velocity Error Budget (TBD) Specified values according similar instruments Temperature Stability in the Cold Bench < 0.01 K According the Zemax-Ansys Instrument Model (TBD) Specified values according similar instruments Time Stability 1 hr to years According the Calibration Procedure (TBD) No Cold Mechanisms involved

Located in the GTC Nasmyth platform F. Javier Fuentes Instituto de Astrofsica de Canarias 5 rea de Instrumentacin Similar Instruments GIANO @ TNG Spectral Range: 0.9 2.5 m (cryogenic) Spectral Resolution > 46.000 RV accuracy < 10 m/s (< 0.1 K) PRVS @ GEMINI Spectral Range: 0.9 1.8 m (not fully cryogenic) Spectral Resolution > 70.000

RV accuracy < 3 m/s long-term (< 1 m/s goal) F. Javier Fuentes Instituto de Astrofsica de Canarias 6 rea de Instrumentacin Similar Instruments SPIROU @ CFHT Spectral Range: 0.9 2.4 m (cryogenic) Spectral Resolution > 50.000 (70.000 goal) RV accuracy < 1 m/s (< 0.01 K) HARPS @ 3.6 m Telescope Spectral Range: visible (non-cryogenic) Spectral Resolution > 120.000

Long-term RV accuracy < 1 m/s (< 0.01 K) F. Javier Fuentes Instituto de Astrofsica de Canarias 7 rea de Instrumentacin Optical Layout. Main Mode Camera OAP3 Detector OAP1-OAP2 Cross Disperser FP2 FP1 Echelle F. Javier Fuentes Instituto de Astrofsica de Canarias

8 rea de Instrumentacin Sizes of Optical Components Element Clear aperture (mm) FP1 ~2x2 OAP1 , OAP2 109 ECHELLE 109 x 220

FLD1 ~ 10 x 10 FP2 ~2x2 OAP3 109 CROSS DISP 109 DETECTOR (HAWAII-2) 36.8 F. Javier Fuentes

Instituto de Astrofsica de Canarias 9 rea de Instrumentacin Mechanical Layout. Fractal Proposal F. Javier Fuentes Instituto de Astrofsica de Canarias 10 rea de Instrumentacin Auxiliary Module. Fractal Proposal F. Javier Fuentes Instituto de Astrofsica de Canarias 11

rea de Instrumentacin Calibration Module. Fractal Proposal Integrating sphere and lamps Gas cell Cryostat window IR camera F. Javier Fuentes Instituto de Astrofsica de Canarias 12 rea de Instrumentacin System architecture.Present status

Mechanical architecture proposed by Fractal is partially driven by the cryogenic Auxiliary Module (Optional Mode) configuration, as well as the configuration/position of the Calibration Module A new cryogenic layout, only shaped by the Main Mode configuration (according the science requirements), is under study The space around the entrance window is very crowded. The configuration and position of the Calibration Module will be optimized after the Main Mode architecture is established The feasibility of the Optional Modes will be studied after the Main Mode architecture is established

F. Javier Fuentes Instituto de Astrofsica de Canarias 13 rea de Instrumentacin Mechanical Layout. Main Mode F. Javier Fuentes Instituto de Astrofsica de Canarias 14 rea de Instrumentacin Mechanical Layout. Main Mode F. Javier Fuentes Instituto de Astrofsica de Canarias 15

rea de Instrumentacin Cryogenics concept. Present status The design of Nahual will be based on Gianos highly stable cryogenics concept. Recent cold tests of Giano show an actively controlled temperature stability better than 0.01 K for short periods of time (~2 hours). Long-term stability remains to be tested. Results from Giano, as well as the implications for Nahual, will be presented within other talk this meeting. Same idea (to adapt the Gianos cryogenics concept) is being considered by the Spirous team (at the Observatoire MidiPyrnes)

F. Javier Fuentes Instituto de Astrofsica de Canarias 16 rea de Instrumentacin Cryogenics concept. Design status (I) LN2 will be an integral part of the optical bench to guarantee a close contact between LN2 and the bench surface. LN2 temperature will be maintained stable by controlling the pressure of the N2 boiling gas down to 1 mbar (TBC) Detailed concepts of the cold shield (to attain an isothermal

environment in the optical bench) and the intermediate shield (or shields), using thick aluminium plates and MLI blankets (10 to 30 layers), will be presented in this meeting. F. Javier Fuentes Instituto de Astrofsica de Canarias 17 rea de Instrumentacin Cryogenics concept. Design status (II) A detailed steady-state thermal model, predicting a density of radiation better than 0.8 W/m2 , has been developed for this configuration.The model will be presented and commented within other talk this meeting. Proposals to avoid hot-spots will be also presented.

A vibration-free pulse-tube cooler will be used, if needed, to cool the detector and the vacuum getter (down to 10 K) F. Javier Fuentes Instituto de Astrofsica de Canarias 18 rea de Instrumentacin Cryogenics concept. Giano design F. Javier Fuentes Instituto de Astrofsica de Canarias 19 rea de Instrumentacin Cryogenics development

A collaborative framework is under discussion between the interested groups (presently Arcetri, IAC and UL) to share the tasks to design, manufacture, integrate and test a cryostat for Nahual. This will allow to identify the final temperature stability that can be reached with the Nahual configuration during long periods of time (as requested in the science requirements). The private companies involved in the design and manufacturing of Giano (Studio Tomerelli and Criotec Impianti) would participate in the development of Nahual cryogenics as far as it is possible. The schedule and detailed task sharing will be discussed during this meeting. F. Javier Fuentes Instituto de Astrofsica de Canarias

20 rea de Instrumentacin Support Trusses concept The following alternatives are being studied for the trusses supporting the cold bench: Gianos isostatic hexapod Same concept, but using flexures/flexural pivots at the interfaces

G-10 isostatic or hyperstatic supports. Flat plates of cylinders Use of titanium instead of stainless steel A detailed analysis of alternatives will be presented within other talk this meeting F. Javier Fuentes Instituto de Astrofsica de Canarias 21 rea de Instrumentacin Cryogenic wheel mechanisms Wheel design could be based on proven concept from existing instruments

F. Javier Fuentes Instituto de Astrofsica de Canarias 22 rea de Instrumentacin GTC Nasmyth envelope compliance F. Javier Fuentes Instituto de Astrofsica de Canarias 23 rea de Instrumentacin

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