Abstract Details
| Name: Sivarani Affiliation: Indian Institute of Astrophysics Conference ID: ASI2015_870 Title : TMT-MOBIE: MCS (Metrology, Calibration and Simulation) Ministudy Authors and Co-Authors : S. Sriram (IIA), S. M. Faber(UCSC, California), Krishna Reddy(ARIES), P. Shalima(IIA), Devika Divakar(IIA), P.Ramya(IIA), Vineeth Valsan(IIA), R. Banyal (IIA), A. Subramaniam(IIA), Brad Holden(UCSC), Andrew Phillips(UCSC), Nick Konidaris (Caltech),Matt Radovan(UCSC), Chuck Steidel(UCSC), Luc Simard (TMT) Abstract Type : Poster Abstract Category : Instrumentation and Techniques Abstract : MOBIE (Multi OBject Imaging Echellette) is a first-generation wide-field seeing-limited instrument for TMT. The spectrograph has two color channels simultaneously spanning 310-550nm and 500-1100nm passbands. The instrument will be mounted at the TMT +X Nasmyth focus which is coaxial with the telescope elevation axis. The entire instrument needs to be rotated with respect to the Nasmyth axis in order to correct for the field rotation during an observation. This can introduce a variable flexure during an exposure. Here, we present some of the ongoing work that is being done as part of the MOBIE Mini-study MCS (Metrology, Calibration, and Simulation). One of the main motivation of the ministudy is to design a Flexure Compensation System (FCS) for MOBIE. As an initial step, we have mapped the spots corresponding to different field positions on the detector. We also calculate the distortion, anamorphic factor in the slit direction, and review possible impacts on planning observations and calibration. We construct a sensitivity matrix for the optical components to design the FCS system. We will also evaluate the accessible range of the detector-hexapods that can be used to compensate for the image shifts. |