| Name: | Bestha Manjunath |
| Affiliation: | Indian Institute of Astrophysics |
| Conference ID : | ASI2023_492 |
| Title : | A new version of fisherman around the pond fiber positioning system for medium multiplexing. |
| Authors : | B. Manjunath, T. Sivarani, Arun Surya, S. Sriram, Amirul Hasan, Ajin Prakash, Hari Mohan Varshney, Devika Divakar, Ramya Sethram, Sudarsan K.
|
| Mode of Presentation: | Poster |
| Abstract Category : | Instrumentation and Techniques |
| Abstract : | In this work, we modified the concept of the fisherman around the pond-type fiber positioning system that corrects atmospheric dispersion and operates on a curved, non-telecentric focal plane with a physical size of more than one meter in diameter. This work intends for multi-object high-resolution optical spectroscopic applications of the thirty-meter telescope.
A large field of view is required for high-resolution multi-object spectroscopy to choose bright objects suited for high resolution. However, It is challenging to use large prisms to correct atmospheric dispersion of the entire TMT's twenty-arc minute field of view (⌀ 2.6m focal plane). Hence, we adapted a concept of correcting dispersion for individual objects after the focal plane. As a result, we developed a new version of the fiber positioning system," fisherman around the pond," where each positioner has four degrees of freedom and a pick-off mirror. Also, It can accommodate optical elements like fiber feeding optics and an atmospheric dispersion corrector. This design is appropriate for high-resolution spectrographs that typically need medium multiplexing.
This design allows the positioner to access any object on the focal plane with maximum targeting efficiency, only limited by the positioner's size. Hence, an efficient global target allocation and sequential motion algorithms are needed. Here, we present optomechanical conceptual design and algorithms for target allocation and positioning of fibers.
|
