Open Access
Table 7
Summary of the TIS general requirements.
| Spatial resolution | Diffraction limit in each optical arm |
| FOV | 60″ × 60″ (60″ diameter for polarimetry) |
| Cycle time | 1. Up to around 60 FPS in spectroscopy mode |
| 2. 10~20 s per spectral line and 1 × 10−3 of Icont in polarimetry | |
| Spectral resolution | Minimum of 50 000 |
| Wavelength samples | 10 per line including a nearby continuum point |
| Number of filters per module | At least 5 |
| Reference spectral lines | 1. Blue: Ca II 396 nm, Ba II 455 nm, Sr 1461 nm, Hβ 486 nm |
| 2. Visible: Mg I 517 nm, Na I 589 nm, Fe I 630 nm, Hα 656 nm | |
| 3. Red: Fe I 709 nm, K I 770 nm, Ca II 854 nm | |
| Broadband reference camera | Each module has 2 reference broadband cameras to perform image reconstruction techniques |
| Operation modes | 1. Narrowband spectropolarimeter |
| 2. Broadband context imager | |
| Polarimetry | Dual-beam to reduce the seeing-induced crosstalk |
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