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Proceedings Paper

Comprehensive transient-state study for CARMENES NIR high-thermal stability
Author(s): Santiago Becerril; Miguel A. Sánchez; M. C. Cárdenas; Ovidio Rabaza; Alejandro Ramón; Miguel Abril; Luis P. Costillo; Rafael Morales; Alicia Rodríguez; Pedro J. Amado
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Paper Abstract

CARMENES has been proposed as a next-generation instrument for the 3.5m Calar Alto Telescope. Its objective is finding habitable exoplanets around M dwarfs through radial velocity measurements (m/s level) in the near-infrared. Consequently, the NIR spectrograph is highly constraint regarding thermal/mechanical requirements. Indeed, the requirements used for the present study limit the thermal stability to ±0.01K (within year period) over a working temperature of 243K in order to minimise radial velocity drifts. This can be achieved by implementing a solution based on several temperature-controlled rooms (TCR), whose smallest room encloses the vacuum vessel which houses the spectrograph's optomechanics. Nevertheless, several options have been taken into account to minimise the complexity of the thermal design: 1) Large thermal inertia of the system, where, given a thermal instability of the environment (typically, ±0.1K), the optomechanical system remains stable within ±0.01K in the long run; 2) Environment thermal control, where thermal stability is ensured by controlling the temperature of the environment surrounding the vacuum vessel. The present article also includes the comprehensive transient-state thermal analyses which have been implemented in order to make the best choice, as well as to give important inputs for the thermal layout of the instrument.

Paper Details

Date Published: 15 July 2010
PDF: 13 pages
Proc. SPIE 7735, Ground-based and Airborne Instrumentation for Astronomy III, 77352S (15 July 2010); doi: 10.1117/12.856455
Show Author Affiliations
Santiago Becerril, Instituto de Astrofísica de Andalucía, CSIC (Spain)
Miguel A. Sánchez, Instituto de Astrofísica de Andalucía, CSIC (Spain)
M. C. Cárdenas, Instituto de Astrofísica de Andalucía, CSIC (Spain)
Ovidio Rabaza, Instituto de Astrofísica de Andalucía, CSIC (Spain)
Alejandro Ramón, Instituto de Astrofísica de Andalucía, CSIC (Spain)
Miguel Abril, Instituto de Astrofísica de Andalucía, CSIC (Spain)
Luis P. Costillo, Instituto de Astrofísica de Andalucía, CSIC (Spain)
Rafael Morales, Instituto de Astrofísica de Andalucía, CSIC (Spain)
Alicia Rodríguez, Instituto de Astrofísica de Andalucía, CSIC (Spain)
Pedro J. Amado, Instituto de Astrofísica de Andalucía, CSIC (Spain)


Published in SPIE Proceedings Vol. 7735:
Ground-based and Airborne Instrumentation for Astronomy III
Ian S. McLean; Suzanne K. Ramsay; Hideki Takami, Editor(s)

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